九年级物理长江寒假作业答案

第一篇：九年级物理长江寒假作业答案

九年级物理长江寒假作业答案

一、单项选择题(每小题2分，共30分)1．下列物态变化中，属于熔化的是（）

A．铁块化成铁水

B．盘子里的水晾干了

C．湖水表面结冰

D．水沸腾时水面出现“白气”

2.下列物态变化现象中，属于液化现象的是()

A.初春，冰雪消融汇成溪流

B.盛夏，刚从冰箱中拿出的饮料瓶外壁出现水滴

C.金秋，清晨的雾在太阳出来后散去

D.寒冬，晾在室外冰冻的衣服也会干 3.图1所示四幅图中，由凝华而形成的自然现象是（）

4．下列物态变化过程中，需要吸热的是（）

Ａ．初春，早晨河面结有薄冰

Ｂ．夏天，打开冰棍纸看到“白气” Ｃ．深秋，屋顶的瓦上结了一层霜

Ｄ．冬天，冰冻的衣服逐渐变干 5．关于“热机”，下列说法中错误的是：

（）A．通过技术改进，可以使热机的效率达到100%

B．减少城市热岛效应的措施之一就是倡导“绿色出行”。

C．用水而不用其它循环物质降低热机的温度，主要是利 用水的比热容最大的特性

D．严寒的冬天，有人晚上把热机水箱中的水放出，是防止气温降低时，水凝固而胀坏水箱 6．医生在发烧病人身上擦鞋酒精溶液，可以达到降低体温的效果。他的依据是（）

A、酒精熔化时吸热

B、酒精液化时吸热 C、酒精汽化时吸热

D、酒精升华时吸热

7．魔术师把手伸进一锅沸腾的“油”，1分钟、2分钟„„再把手拿出来——没事！对这一现象的分析正确的是（）

A．魔术师有特异功能

B．是因为“油”的沸点低 C．“油”在沸腾时的温度不断升高

D．是因为手上沾有水吸收了“油”中的热 8.下列四个实例中，能够使蒸发减慢的是（）

A．将湿衣服晾在通风向阳处

B．将湿手伸到干手器下方吹 C．将新鲜的黄瓜装入塑料袋

D．将新收获的玉米摊开晾晒

9．下列有关热现象的说法中正确的是（）

A．高空中的冰晶在空气中下落变成雨滴时，内能增加了 B．初冬的早晨，地面上结有一层白霜属于升华 C．所有物体在熔化过程中温度不断升高

D．物体的温度可以降到-273.15℃以下

10．以下与物态变化相关的说法正确的是（）

A．气衣柜里放樟脑片，利用了汽化

B．气温低于水银熔点的地方，不能使用水银温度计

C．北方的冬天，在菜窖里放几桶水，是为了利用水的汽化吸热

D．电冰箱使用的制冷物质工作时，在冷冻室要液化，在冷凝器要汽化 11．如图所示，能正确的描述冰的凝固过程的图象是（）

12．如图3所示是一个能吹出冷热风的电吹风简化电路图，图中A是吹风机，B是电热丝。下列分析正确的是（）

A．只闭合开关S2，电吹风吹出热风

B．只闭合开关S1，电吹风吹出冷风 C．同时闭合开关S1、S2，电吹风吹出冷风

D．同时闭合开关S1、S2，电吹风吹出热风 13．下列有关“电”的说法正确的是（）

A．摩擦起电的实质是创造了电荷

B． 电灯中有电流，它的两端一定有电压 C．电路两端有电压就一定有电流

D．运动的电荷一定形成电流 14．如图所示的电路，闭合开关S1和S2后，下列分析正确的是（）

A．小灯泡亮，电铃响

B．小灯泡亮、电铃不响； C．小灯泡不亮、电铃响

D．小灯泡不亮、电铃不响

15．某种电脑键盘清洁器有两个开关，开关S1只控制照明用的小灯泡L，开关S2只控制吸尘用的电动机M。在图5所示的四个电路图中，符合上述要求的是（）

二、填空题(第17、19、24、25题每空1分，其余每小题2分，共24分)16．我国家庭电路的电压是___________V；对人体的安全电压是不高于________V。

17．向云层投撒干冰是人工增雨、缓解旱情的方法之一。投撒到云层中的干冰

为气体，并从周围

大量的热，使空气中的水蒸气

为小水滴或

为小冰晶，下落而形成雨。

18．如图，把两只手分别放入热水和冷水中。然后，先把左手放入温水中，感觉温水的冷热程度；再把右手放入温水中，感觉温水的冷热程度。先后两次对温水冷热程度的感觉是__________________（选填“左手感觉热些”、“右手感觉热些”或“一样热”）。这一现象表明____________（选填“物体的冷热程度叫温度”、“只凭感觉判断温度是可靠的”或“只凭感觉判断温度是不可靠的”）。

19．如图所示是电冰箱工作原理图。电冰箱工作原理是利用了一种叫氟利昂的物质作为热的“搬运工”，把冰箱冷冻室里的“热” 搬运到冰箱外边。氟利昂是一种既容易___________,又容易____________的物质(填物态变化的名称)。工作时，电动压缩机将氟利昂蒸气压缩并把它压入冰箱的冷凝管里，在这里蒸气变成液体并_________(“吸热，或“放热，)，这些热被周围空气带走。冷凝器里的液态氟利昂，经过一段很细的毛细管进入冰箱内冷冻室的管子里，在这里迅速汽化________(“吸热”或“放热”)，使冰箱内温度降低，生成的蒸气又被压缩机抽走，压入冷凝器，再液化并把从冰箱内带出来的热放出。氟利昂这样循环流动，冰箱冷冻室里就可以保持相当低的温度。

20．“钻木”能“取火”，说明____________可以改变物体的内能；“烤火”能“取暖”，说明____________可以改变物体的内能．

21．2011年春季以来，长江中下游地区遭遇罕见的旱灾。进入夏季以来，气温的升高加剧了旱情，这是因为气温的升高________(选填“增加”或“减小”)水的蒸发。为了节约用水，果农们利用了滴灌的方法给果树浇水，如图7，把水滴入果树下的土里，这是利用___ _____(选填“增加”或“减小”)水在地面的表面积来减小水的蒸发.22．物理学中把被毛皮摩擦过的橡胶棒所带的电荷称为_____电荷；电荷间的相互作用规律是_______________________。

23．台式电脑使用一段时间后，为保证电脑的稳定性，需要打开主机箱盖除尘，这是因为散热风扇的扇叶在转 动过程中与空气摩擦带上了

，可以

轻小物体，所以灰尘会附着在扇叶上。

24．如图是简化了的电冰箱的电路图。图中M是压缩机的电动机，L是电冰箱内部的照晚灯。当电冰箱接入电路后，关闭了电冰箱的门时，开关S1与S2的状态是S1___ __ S2___

__；当又打开正在工作的电冰箱门时，开关S1与S2的状态是S1___ __ S2___

__。（填“闭合”或“断开”）

25．20kg的柴油完全燃烧释放的热量是

J。（q柴油=3.3×107J/kg）

三、简答题(4分)26．夏天，扇扇子为什么会感到凉快?

四、计算题(每小题7分，共14分)27．木炭的热值为3.4×107J/Kg，完全燃烧多少千克木炭能放出1.7×107J的热量？如果这些热量全部被质量为50Kg、温度为10℃的某种液体吸收，温度升高到90℃。那么，这种液体的比热容是多少？

28．完全燃烧140克的干木柴所放出的热量让质量为5Kg、初温为30℃的水全部吸收，水温会上升多少℃？（干木柴的热值为1.2×107J/Kg，大气压为1标准大气压）

五、实验探究题[第30题(3)第二空、第31题、第33题第三、四空，34题每空各2分，其余每空1分，共28分] 29．请将图所示的测量结果记录在相应的空格中。

(1)温度计的示数_______℃；(2)如图乙所示，体温计的示数是_______℃；

（3）某次测量时两电表示数如图所示，则通过小灯泡的电流为

A，小灯泡两端的电压为

V，30.在探究水的沸腾实验中：

（1）1个标准大气压下酒精的沸点是78℃，煤油的沸点是150℃，完成本实验所用的温度计液泡中的液体可能是

（选填“酒精”或“煤油”）；

（2）下表是某组同学的实验记录，他们测得水的沸点是

℃； 时间/min 0 2 4 6 8 10 温度/℃ 90 93 96 99 99 99

（3）请根据上表的数据在图24的坐标中描点画出水的温度 随时间变化图象。（2分）

31．根据图所示的实物电路，在虚方框内画出对应的电路图．

32．将两盏相同的灯L1和L2串联或并联后，直接接在电压为6V的电源上。两灯都发光。请根据下列操作及观察到的现象，判断灯L1、L2的连接方式，并填入表格中。

操作 取下一盏灯 取下一盏灯 将电压表并联接在一盏灯的两端 将电压表并联接在一盏灯的两端

现象 另一盏灯仍能发光 另一盏不发光 电压表示数为3V 电压表示数为6V L1、L2连接方式

33.炎热的夏天来啦!小明家买了一台电风扇。站在电风扇旁，小明觉触凉爽。于是他大胆猜想：是电风扇降低了室内温度。为了验证猜想，他关闭了门窗，选取两支相同的温度计，进行了如下的探究实验。下列步骤中有来完成的部分，请将其补充完整。

这一现象引发了小明的思考，为什么室温没有降低，而吹电风扇却觉得凉爽呢?小明联想到液体蒸发的知识。人体是通过汗液蒸发来调节体温的，人在吹电风扇时，汗液比平时蒸发得更快，所以感到凉爽。

为了证明吹电风扇能加快蒸发吸热的速度，小明又进行了实验，他只增加一种物质，并且首先补充了一个步骤，然后重复前面实验的操作。请你将下表的内容补充完整。

34．在“探究串联电路中各点的电流有什么关系”时，小明设计实验如下．

A点的电流IA B点的电流IB C点的电流Ic 第一次测量 0.3A 0.3A 0.3A 第二次测量 0.2A 0.2A 0.2A 把两个灯泡L1、L2串联起来接到如图所示电路中，分别把图中A、B、C各点断开，把___________接入，测量流过的电流，看看它们之间有什么关系．换上另外两个小灯泡，再次测量三点的________，看看是否还有同样的关系．上表是两次测量的记录数据．

分析和论证：

(1)在拆接电路时，开关S必须处于________状态．

(2)结论：串联电路中各处__________相等．

漳州市浦南中学期中考试卷

九年级物理答案

一、单项选择题(每小题2分，共30分)题号 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 答案 A B D D A C B C A B A D B C D

二、填空题(第17、19、24、25题每空1分，其余每小题2分，共24分)16．220

17．升华

吸热

凝华

18．.⑴右手感觉热些

只凭感觉判断温度是不可靠的 19．汽化（液化）

液化（汽化）

放热

吸热 20．做功

热传递

21．增加，减小

22．负

同种电荷相互排斥，异种电荷相互吸引 23．电荷（静电）；吸引

24．闭合 断开

闭合闭合 25．6.6×108J

三、简答题(4分)26．夏天，扇扇子可以加快空气流动（1分），从而加快蒸发（1分），蒸发时吸热（2分）。所以人会感到凉快。

27． 0.5 Kg；4.25×103J/（Kg•℃）

28.Q放=mq=0.14kg×1.2×107J/kg=1.68×106J 根据Q=cmΔt可算出Δt=80℃，但在1标准大气压下，水的沸点是100℃，虽然继续吸热，但温度始终保持100℃不变。所以水升高的温度应为：

Δt=100℃-30℃=70℃ 29．28

36.6 30．（1）煤油

（2）99（3）略 31．如图

32．并联

串联

串联

并联

33．（1）分别放在靠近电风扇和远离电风扇的位置 [增加物质]

水（酒精）

[补充步骤]

将两支温度计的玻璃泡同时蘸取适量的水（酒精）

[分析论证]

靠近电风扇的温度计的示数降低较快（远离近电风扇的温度计的示数降低较慢）

34．电流表 电流

（1）断开 2）电流

（

第二篇：九年级英语长江寒假作业答案

九年级英语长江寒假作业答案

第一部分听力（30分）

I.听句子,从A、B、C三个选项中，选择最佳应答语,并在答题卡上将该项 涂黑。每个句子听两遍。（每小题1分,共5分）

1.A.Fine, thanks.B.See you.C.Good morning.2.A.On Sunday.B.At 8 ：00 a.m.C.In July, 1989.3.A.Yes, I am.B.Yes, I can.C.Yes, please.4.A.It’s a T-shirt.B.It's a white T-shirt.C.It's his T-shirt.5.A.He is forty.B.He is a doctor.C.He is in black pants.II.听5段短对话。从A、B、C三个选项中，选择最佳答案,并在答题卡上将 该项涂黑。每段对话听两遍。{每小题1分，共5分）

6.What does the man usually do on Sundays? A.He usually plays computer games.B.He usually plays basketball.C.He usually plays football.7.What are they talking about? A.People.B.Cars.C.Traffic accidents.8.What’s the date today?

A.It’s March 17th.B.It’s March 18th.C.It's March 19th.9.Could the boy swim one year ago? A.Yes, he could.B.No, he c ouldn't.C.No, he can’t.10.What’s the woman’s favorite Chinese festival?

A.The Lantern Festival.B.The Spring Festival.C.The Mid-autumn Festival.III.听1段长对话，从A、B、C三个选项中，选择最佳答案，并在答题卡上将 该项涂黑。对话听三遍。（每小题2分,共10分）。www.xiexiebang.com 11.Does Kate like watching TV? A.No, she hates it.B.No, she doesn’t.C.Yes, she d oes.12.How many hours does Kate watch TV every day? A.About four.B.Over five.C.About three.13.Which TV program does Kate like best? A.Movies on TV.B.News reports.C.TV plays.149.How often does Kate watch movies on TV till midnight? A.Every day.B.Sometimes.C.Always.15.What is Jack’s advice?

A.Kate should have enough rest.B.Kate should watch TV for a long time.C.Watching TV is good for Kate’s health.IV.听短文,从A、B、C三个选项中，选择最佳答案，并在答题卡上将该项涂 黑。短文听三遍。（每小题2分，共10分）

16.I am going to ______ every morning during the winter holidays.A.watch TV

B.join a guitar club

C.read English 17.In the evening of the holidays, I’ll watch TV ______.A.for the whole holidays B.for only one hour

C.for one night 18.I will join a ______ club.A.guitar

B.dance

C.music 19.I will ______ on time in my winter holidays.A.read English

B.watch TV

C.go to bed and get up 20.I’m sure I will ______ from the travelling.A.play the guitar betterB.learn English better C.have a good time and learn a lot 第二部分单项选择（10分）

从下列各题所给的A、B、C、D四个选项中，选择能填入空白处的最佳选 项,并在答题卡上将该项涂黑。（每小题1分,共10分）21.Pl ease give ______ English book to her.A.me

B.I

C.mine

D.my 22.—Could you please pass me something to eat? —What about some ______? A.water

B.orange

C.fish

D.tea 23.Her mother goes to work ______ bus every morning.A.by

B.at

C.on

D.in 24.—Who’s that girl?

—You mean ______ one with long blond hair? That's Jack’s daughter.A.a

B.an

C.the

D.不填 25.Lucy ______ a student last year, but now she ______ a teacher.A.is;is

B.was； is

C.was； will be

D.is； was 26.—Were you at home at 9:00 last night? I called you but nobody answered.—Sorry，I ______ at that time.A.take a shower

B.took a shower C.was taking a shower D.am taking a shower 27.—Mum, I can't find my shoes.—Hurry up!Your father ______ for us.A.is waiting

B.waited

C.waits

D.will wait 28.—I have ______ in learning English and I’m so worried.Could you help me with it? —Sure, I’d love to.A.joy

B.interest

C.trouble

D.fun 29.—I’ve never had such a wonderful time.Tha nk you for inviting me.— ______.A.That’s right.B.You're welcome.C.That’s it.D.Good job.30.When winter comes, days get ______.A.long and long B.short and short

C.longer and longer D.shorter and shorter 第三部分

完型填空（10分）

阅读短文,从短文后各题所给的A、B、C、D四个选项中，选择能填入空白处 的最佳选项,并在答题卡上将该项涂黑。（每小题1分，共10分）

Last week our school held a sports meeting.Everyone in our class felt very 31 because we were the winners.In the boys’ relay race, Michael 32__ very fast and our class won the first place.Yu Ting is good 33 the long jump and she 34 won.We，re sorry that we 35 in the high jump, but we’re sure we 36 do better next time.I took part in the boys，37 race.I did my best and was the first 38 the finish Line.TTKis encourages 39 _ a lot.Now I love sports better.I want to be a soccer player.I will take more exercise every day and I hope some day I 40 able to take part in the Olympic Games.31.A.worried B.surprised

C.excited D.frightened 32.A.runs

B.ran

C.run

D.is running 33.A.for

B.in

C.to

D.at 34.A.also

B.too

C.either

D.as well 35.A.do badly B.did badly

C.do well D.did well 36.A.could

B.can

C.may

D.would 37.A.400-meter B.400-meters C.400 meter D.400 meters 38.A.passes B.pass

C.passed D.to pass 39.A.me

B.him

C.her

D.us 40.A.am

B.be

C.will be D.was 第四部分阅读理解（30分）

I.阅读短文，根据短文内容,从短文后各题所给的A、B、C、D四个选项中, 选择最佳选项,并在答题卡上将该项涂黑。（每小题2分，共20分）A American boys and girls love to watch television.Some children spend six hours a day in school and four to six hours a day in front of the television set.Some even watch television for eig ht hours or more on Sunday.Televisions are like books or films.A child can leam bad things and good things from them.Some shows help children to understand the news and places from other countries or other times in history.With television a child does not have to go to the zoo to see animals or to the ocean to see a ship.Boys and girls can see a play, a concert or a game at home.Television brings many places and events into our homes.Some programs show crime and other things that are bad for children，so parents sometimes help them to find other interesting things to do.41.Childre n usually spend ______ a day in school.A.six hours

B.more than eight hours C.only a few hours

D.four hours 42.Some children spend eight hours or more ______ on Sunday.A.studying

B.playing C.watching TV

D.helping their parents 43.On television children can see ______.A.games B.big animals

C.oceans D.almost everything 44.“Television brings many places and events into our homes." means ______ A.television makes things happen on homes B.we can know places and events without going to see them C.we can see houses and buildings on TV D.we can find them easily 45.Parents sometimes help their children find other things to do when there is ______ for children.A.a bad program

B.an animal C.a game

D.an uninteresting film B William Henry Harrison, the ninth president of the US, was bom in a small town.When he was a boy, he was very quiet and shy.Because he was so quiet, every one thought that he wasn't bright.The people in the town often put a nickel(五 分硬币）and a dime(一角硬币）before him and asked him which to choose.He always chose the nickel and they laughed.One day a woman felt sorry for him.She askeddo you never take a dime and always choose a nickel instead? Do you know a nickel is worth much less than a dime?” “ Certainly I know it,，’ William answered slowly.“ But if I choose the dime，they will not ask m e to choose them any more.”

46.Which of the following is true according to the passage? A.William Henry Harrison was the eighth president of the United States.B.William Henry Harrison was bom in a big town.C.William Henry Harrison was very quiet and shy when he was a boy.D.William Henry Harrison wasn’t bright.47.Why did people in the town think that he wasn’t bright? A.Because he was bom in a small town.B.Because he was so quiet.C.Because he was the ninth president of the US.D.Because he liked money.48.Why did the people laugh at William Henry Harrison? A.Becausse he was bright.B.Because he was not shy.C.Because he loved the nickel.D.Because he always chose the nickel.49.Did William Henry Harrison know a nickel was worth much less than a dime? A.Yes, he did.B.No, he didn’t.C.Yes, he does.D.No, he doesn’t.50.What do you think of William Henry Harrison? A.Stupid.B.Clever.C.Naughty.D.Brave, II.阅读短文,判断短文后各题所给句子的内容是否与短文内容相符，相符 的请在答题卡上相应题号后的选项中将A项涂黑，不相符的则将B项涂黑。(每小题2分,共10分）

2012 has also brought in a new age for Chinese TV.The country’s first 3-D TV channel has started broadcasting(播放).Opened on New Year’s Day, the channel will air different programs including documentaries, sports, serials and live events— including the CCTV New Year Gala and the Olympic Games.The 3-D channel broadcasts from 10:30 a.m.through midnight，Beijing time each day.There are no viewing fees(费用）during the early phase of operation(运行阶段），and viewers can get the full 3-D effect by wearing 3-D glasses.Six TV stations have worked together to produce the channel, including CCTV, Beijing, Tianjin, Shanghai, Jiangsu and Shenzhen TV stations.Each station is working on a specific program, while the channel itself is broadcast through CCTV.51.The country's first 3-D TV channel started broadcasting on New Year’s Day.52.The 3-D TV channel will not air the Olympic Games.53.Viewers can get the full 3-D effect by wearing 3-D glasses.54.The 3-D TV channel broadcasts from 8:30 a.m.through midnight, Beijing time every day.55.Tliere are viewing fees(费用）during the early phase of operation(运行阶段）• 卷 II第五部分

任务型阅读（10分）

I.阅读短文，按照短文后的要求答题。请把答案写在答题卡相应的位置。（每 小题2分，共10分）

More than 85% of respondents(调查对象）to a survey about the Chinese Lunar New Year said they expect the festival's traditions to be continued, survey res ults have show n.The survey, done online by the China Youth Daily Social Investigation Center on 7,012 people, showed that 88%of respondents consider reuniting with family to be the most important part of the festival.According to the survey, 78.6% of respondents see the festival as an opportunity to visit relatives as many people live far from their hometowns.Wan Jianzhong, a professor of Beijing Normal University, said that Lunar New Year traditions, including visiting the elderly, holding family get-togethere and setting off firecrackers(放鞭炮），have mostly been preserved(保持），but some others are disappearing.“ During the Spring Festival，people woricing outside their hometowns hurry to get home and reunite with their families.This causes a great national migration(迁徙），because the tradition of family get-togethers on Chinese New Years Eve is rooted in the hearts of the Chinese，” Wan said.任务一：替换

56.写出短文中能替换下列句子划线部分的词或短语。

According to the survey, over 5960 respondents expect Lunar New Year traditions to be continued.任务二：用英语回答问题。

57.How many people were surveyed about the Chinese Lunar New Year? 58.Where was the survey done? 59.Was holding family get-togethers a Lunar New Year tradition? 任务三：翻译

将短文中的划线部分翻译成中文。第六部分

词汇（10分）

根据句意和首字母或汉语提示，写出句中所缺单词的正确形式，每空一词。请把 完整的单词写在答题卡相应的位置。（每小题1分,共10分）

61.Mike’s parents are b __________ teachers.Xk b1.co m 62.People will __________(飞往）to the moon for vacation.63.You should ___________(刷)your teeth after meals.64.Don't __________(吼）！I can hear you.65.Mary wanted to buy a __________(新的）computer.66.Keep your eyes closed.Don't open them u__________ I tell you to do so.67.Lucy is thinner than Lily, but Lily is t __________ than Lucy ? 68.M__________ is the fifth month of a year.69.My favorite season is __________(夏季）because I can swim in the river behind my house.70.What are you g__________ to do tomorrow? 第七部分情景交际（10分）

根据对话内容，在每小题的空白处填上合适的句子，使对话意思完整、通 顺。请把答案写在答题卡相应的位置。（每小题2分，共10分）

David：Excuse me, sir.Could you please tell me the way to the Space Museum? Man: Sorry,.David：Thank you all the same.(Then David goes and asks a woman for help.)David ：

Excuse me，could you tell me how I can get to the Space Museum? Woman：Sure.Go along this street.When you reach the traffic lights, turn left.At the end of the road, you'll see it.David：It's very kind of you.By the way，72 ? Woman: No, it is not very far.David ： Can I take a bus to get there? Woman ： 73.David ：74 ? Woman ： You can take the No.17 bus.David： 75.Woman:It’s my pleasure.第八部分短文改错（10分）

此题要求改正所给短文中的错误，对标有题号的每一行划线部分和有漏字 符号（A）处作出判断： 如无错误，在该行右边横线上画一个如有错误（每行只有一个），则按 下列情况改正： 划线部分为多余的词:把该词写在该行右边横线上,并划上斜线（）。划线部分为错词:在该行右边横线上写出正确的词。有浞字符号处缺一个词:在该行右边横线上写出所缺的词。

请在答题卡相应位罝答题。（每小题1分，共10分）

Two years ago, my English class is difficult.First of all，76.__________ I couldn’t understand the teacher when she speak English.She

77.__________

spoke so quick that I couldn’t understand every word.Later

78.__________ on，I realized that it don’t matter if you dont understand every

79.__________ word.I was also afraid to speak in die class, because I thought

80.__________ my classmates might laugh at me.I couldn’t always make complete 81.__________ sentences，either.Then I started to watched English-language TV.82.__________ I think that doing lots of listening practice is one of the secret of

83.__________ becoming a good language leamer.Now I enjoy leam English and 84.__________ I got an A this term.My teacher is very impressed.85.第九部分书面表达（30分)书面表达分A、B两部分,A部分10分,B部分20分。A.假如你校成功举办了第一次英语角活动，请根据下列提示，以“The First English Comer in Our School”为题，用英语为学校的校报写一篇20-30词的简 讯。请在答题卡相应位罝答题。（10分）

活动时间:2012年6月14日下午3:00-4:00 活动内容:用英语交谈英语学习的方法 活动地点:学校图书馆 参加人数:英语教师和学生共100余人 活动效果:学生积极参与，有利于促进英语学习

B.假如你是张武,是某校八年级学生，感到学习任务太重,每天要学习的科 目多，老师布罝的作业多，连周末和节假日都有做不完的作业，很多时候放学后 老师还要补课，每天几乎都没有属于自己的时间，睡眠时间严重不足，身心疲惫，不知道怎么办。请你以张武的名义用英语写一封80-100词的信给某报社的中 学生信箱，谈谈你的这种情况，并希望老师们少布罝作业，多 关爱学生的健康成 长。（20分）

部分参考词汇:editor(编辑）task(任务）healthy growth(健康成长）subjects(科目）

第三篇：九年级长江寒假作业英语答案

九年级长江寒假作业英语答案

听对话或独白，根据对话或独白的内容，从下面各题所给的A、B、C三个选项中选择最佳选项。每段对话或独白读两遍。（共12分，每小题1分）请听一段对话，完成第5至第6小题。5.Where does the woman want to go? A.The library.B.The post office.C.The City Bank.6.What should the woman do at the traffic lights? A.Turn right.B.Tum left.C．Go forward.请听一段对话，完成第7至第8小题。7.Why did the woman take pictures of her flat? A.To put them in her living room.B．To show them to her friends． C.To send them to her parents.8.Which room does the woman like best?

A.The study.B.The living room.C.The、bedroom.请听一段对话，完成第9至第10小题。9.When does the man go to the gym every day? A.After breakfast.B.After lunch.C.After dinner.10.What's the man's job? A.A reporter.B.An actor.C.A doctor.请听一段对话，完成第11至第13小 题。11.Why is the man asking for hot water? A.He is thirsty.B.His feet hurt.C.He feels cold.12.How well did the man do in the race?

A．He was in the middle.B.He was one of the fastest.C.He was one of the slowest.13.What can you learn from the conversation? The man enjoys running.B.The man wants to win the race.C.The woman will run with the man.请听一段对话，完成第14至第16小题。14.What's the speaker mainly talking about? A.His students.B.His job.C.His trouble.15.What do the students usually do duringthe lesson? A.Mark their coursework.B.Do experiments.C.Answer questions.16.What does the speaker think of his way of teaching? A.It bores the students.B.It saves time C.It works.三、听对话，根据所听到的对话内容和提示词语，记录关键信息。对话读两遍。（共10分，每小题2分）Healthy Dentistry To: Dr.Lee

Patient’s name: Bill __17__

Last check-up: __18__ ago

Check-up time: __19__, July 4 7:30 in the __20__

Room number: __21__

知识运用（共25分）

四、单项填空。（共13分，每小题1分）

从下面各题所给的A、B、C、D四个选项中，选择可以填入空白处的最佳选项。22.The lovely girl is from Class6.____ name is Alice.A.Her

B.His

C.Your

D.Its 23.—Is your father home? —No，he’s working late ____ the office.A.on

B.at

C.of

D.to 24.There were only two paintings for sale and he bought ____.A.all

B.any

C.both

D.some 25.Let’s ____ for a walk, shall we?

A.to go

B.going

C.go

D.gone 26.—Where were you last Saturday? —I ____ in the Capital Museum.A.am

B.will be

C.was

D.have been 27.—Mum, must I wash the dishes right now? —No, you ____.A.shouldn’t B.wouldn’t

C.mustn’t

D.needn’t 28.I work hard this term, but Peter works much ____.A.hard

B.harder

C.hardest

D.the hardest 29.—May I speak to the headmaster? —He ____ a meeting now.Can I take a message? A.is having B.had

C.has

D.will have 30.There are no buses, ____ you’ll have to walk.A.so

B.or

C.but

D.for 31.— ____ is the dictionary? —It’s $22.95

A.How old B.How long

C.How thick D.How much 32.I ____ Mr.Smith since he moved to Shanghai.A.didn’t hear from

B.don’t hear from C.won’t hear from

D.haven’t heard from

33.Today, computers are really helpful.They ____ everywhere.A.use

B.are used

C.used

D.were used 34.—Can you tell me ____ the prize, Tom? —Last year。

A.when you got

B.when did you get C.when will you get

D.when you will get

五、完形填空。（共12分，每小题1分）

阅读下面的短文，掌握其大意，然后从短文后各题所给的A、B、C、D 四个选项中，选择最佳选项。

Several weeks ago, our headmaster, Mr.Gaudi, told usthat our school had been chosen to compete on Smart Aleck—a game show which my best friend Carla and I both love.Carla has a good imagination, and I know a lot of history, so we thought we’d be good __35__ for the team.A few days later, Mr.Gaudi held a meeting with everyone interested in the__36__.He told us that Smart Aleck uses a five member team.He also said that three more people would be needed as backup（替补）.Unluckily four times that many students were at the meeting.So Mr.Gaudi said we would have a __37__ and the top eight scorers would become the team and the backup.Everybody agreed that this was a __38__ way to decide.Yesterday, all of the hopefuls went to the dining hall after school.We would have to decide the starting line-up（阵容）.Mr.Gaudi acted as the host.After a couple of hours, all the __39__ on the team were set except one.Carla and I __40__ for that last position.We had to hold a one-on-one competition between the two of us.The winner would be on the team and the loser would be the backup.Midway through our two-person competition,I was starting to pull ahead.__41__ I saw the look on Carla's face.I waited for a second and knew what I had to do.As much as I wanted to be on Smart Aleck,Carla wanted __42__ even more.So,starting with my next question,I held back and le t Carla __43__,just by a little bit.Her expression as she __44__ she would be on the show made up for my not being on the team.And since I will go as backup,I'll still have the fun of seeing the show up close.Was I __45__ by not trying as hard as I could?I don't think so.No one noticed,and Carla and I didn't __46__ it.It won't hurt the team because Carla will be a very good competitor on the real show.I think that making my best friend happy was the right thing to do.35.A.choices B.pairs C.leaders

D.fans 36.A.course B.work C.trip

D.show 37.A.direction B.discussion C.competition D.conversation 38.A.special B.hard

C.fair

D.funny 39.A.places B.rules C.names

D.orders 40.A.tied

B.clapped C.cried

D.returned 41.A.Still

B.Never C.Then

D.Again 42.A.us

B.it

C.me

D.her[来新 课标 第一 网 43.A.wait

B.turn

C.move

D.win 44.A.accepted B.realized C.considered D.decided 45.A.coming

B.refusing C.helping

D.cheating 46.A.mean B.plan

C.regret

D.say 阅读理解（共44分）

六、阅读下列短文，根据短文内容，从短文后各题所给的A、B、C、D四个选项中，选择最佳选项。（共26分，每小题2分）A Join Us for a Day at Sun Valley Amusement Park Children aged 10 to 14 are invited to take part in the “Event of the Summer” at Sun Valley Amusement Park, the most popular amusement park on the East Coast.Sun Valley has more than 80 amusement rides.For sports lovers, there are basketball courts, an indoor baseball field, and climbing walls.No amusement park would be complete without a gift shop.Sun Valley has two.You won’t want to miss out on this day of fun.Join us at Sun Valley Amusement Park on July 14 Register（登记）early. The cost of the trip is $25.This includes tickets and all rides. We suggest that all children bring lunch. Buses leave at 9:00 AM and return at 5:00 PM. Rain Date: Wednesday, July 16.Register at the Children’s RecreationCenter at the Town Hall by July 3.A one-day registratio n will also be held on July 1 at the Brown School.For more information, call Jane Parks at 555-7267

47.Who can take part in the “Event of the Summer”? A.Children under 5

B.Children over 16 C.Children aged 10-14

D.Children aged 5-9 48.The children had better bring ____ A.a basketball

B.lunch

C.a gift

D.gloves 49.When can children register at the Brown School? A.On July 1

B.On July 3 C.On July 14 D.On July 16 B Street Ping Pong— Ping!Do you like table tennis? If you had travelled to cities in the UK like London or Birmingham last summer, you might have seen one of the dozens of free tablesthat were there as part of a project（项目）called Ping!.What is Ping!?[ xk b 1.c o m] Ping！is a three-year table tennis project.It has been running since 2010 and this year, 2012, is the final year.The idea is to put free table tennis tables in eight different towns in the UK for four weeks during the summer.Each table comes with its own bats and balls and is free to play.You can find the tables outdoors.What does Ping!hope to achieve? It would be great if Ping！helped find a new Olympic table tennis star but what Ping!really hopes.to achieve is just to get people playing and having fun together.“Putting a ping pong table on the street gives people a chance to connect with other people,” said MeeraSodha, Ping!Project Manager.One of the towns that took part in the project was Hull, a city in England.Forty-five tables were put into the city.JakobAdamski, an ESOL student learning.English, said, “I really enjoyed playing table tennis in the park.It was alsoagood way for me to practise my English and meet people.” 50 When did the Ping!project start? A.Last summer.B.Last winter.C.In 2010.D.In 2012.51.What's the Ping!project?

A.Choosing table tennis stars.B.Holding table tennis matches.C.Teaching people how to.play table tennis.D.Putting free table tennis tables in some towns.52.The purpose of the Ping!project is

A.to help people practise English B.to invite people to visit the UK cities

C.to get people to play and have fun together.D.to encourage people to take part in the 2012 0lympics C The right name is important in the business world.All you have to do is think of the names for some of the products you buy every day and you’ll agree that the name and the product are connected in the everyone’s mind.In many countries, successful trade or brand names are protected by law.This is so that other companies cannot make a product and, in fact, be buying something different.Businesses register a company or a product name with the government.In fact, more than 1,000 product and company names are registered every hour.Many companies spend a lot of money to find the right name for their products.A good example of this is.In the car industry.Some successful names for cars have powerful associations（联系）.The Ford Mustang and the Jaguar are only two examples of choosing the names of animals that are fast and strong.When a U.S company decides to sell its product in another country, it has to make sure that the product name translates properly.When Coca-Cola introduced its soft drink to China, it looked for the right name.It wanted a name that would do two things.One was to present its image（形象）in Chinese and the second was to be close to its first brand name—Coke.It took some efforts before finding the right word —which sounds similar and translates as “happiness in the mouth”.Asian company names are not new to the United States.The brand names of Samsung and Sony have been successful.Finding the right brand name is a big business.Asian companies that sell to foreign markets pay to find a name that will connect with its customers.There are even naming companies that specialize in inventing product names.These companies can charge（要价）up to $100,000 a word for their creations.But it’s worth it.Successful companies know how important the right brand names are for their development.53.Why are trade names protected by law in many countries? A.To make companies pay for naming service.B.To help people choose the best products C.To present good images of the products.D.To prevent good images from being copied 54.What can we learn from the passage? A.Many companies care about the cost of finding the right names B.Creative trade names can help companies to have a larger sale C.The government often does business with naming companies D.It is considered necessary for cars to be names after animals 55.What’s the best title for the passage? A.The Business of Names B.The Development of Names C.The Rules of Naming Business D.The Methods of Choosing Names D Reading Oliver James'Affluenza,I thought about what often happens at home.My 12-year-ole daughter is in tears.“I have so take a test tomorrow.I don't understand any of it,”she cries out.After shouting and shutting her door,she calms down enough to go through her notes.The following dry I ask her how the test went and the just says“OK,I got a nine”.“Wow.well done!”I s ay,before she finishes with “But I never get a ten!” According to James,this obsession with getting top marks has been a bad development,which encourages people to think of education in terms of work and money.To test this,I asked my daughter why she was so worried about her tests.She looked at me as if I was thick.“Well,if I don't get good grades,I won't be able to afford nice things like a car and stuff.” I was quite surprised,because I don't consider myself a pushy parent.But James suggests and it leaves students feeling failures even if they are very bright.He points to the Danish system（体制）of education as a better model.Creating happy citizens who have good social skills is seen as more important than high achievements at school or the needs of business.For me,I cannot remember the last time I had to work out the area of a circle,recite a Shakespeare poem or grammar rules,yet I have lived a happy life.What I really needed to learn at school was how to make polite conversations,or how to avoid getting into debt or how to develop good personality.This is in fact similar to what Oliver James really has in mind.And he is looking for schools where students are encouraged to find and follow their own interests,something more like Tongjon.Tongjon has been developed in some Korean private schools.It is quite different from the more rigid system of learning things by heart that is used in Korea,and indeed in many other school systems around the world.As the Russian poet Pushkin said,“Inspiration(灵感）is needed in geometry(几何学）just as much as in poetry ”,and inspiration does not come from endlessly revising for tests or getting worried about them.56.What does the writer probably think of his/her daughter? A.She sets herself a goal too high to reach.B.She should be more polite to her parents.C.Sheis hard-working but not very bright.D.She takes her grades much too seriously.57.What does the word “obsession”in paragraph 3 mean? A.A plain and unavoidable fact.B.A satisfied and very prou d state.C.A practical and widely-used way.D.A fixed and often unreasonable idea.58.What can we infer from the passage?

A.Social skills are as important as high grades.B.Interest in grades can shake self-confidence.C.The writer regrets not having studied hard at school.D.Danish educational system is for very smart students.59.The writer wants to tell us that____.A.learning happily is the key to self-development.B.top marks may be helpful to increase one's interest.C.tests should be improved to give children inspiration.D.education should meet one's needs for word and money.七、阅读短文，根据短文内容，从短文后的五个选项中选出能填入空白处的最佳选项。选项中有一项为多余选项。（共8分，每小题2分）

Dr.Jack Todd is very interested in clean water.____,so it's natural that he is to developer of a small and affordable system(系统）to clean wastewater,His “Living Machine" can clean wastewater in your home or in your business.__61__ The wastewater goes into a big plastic tank where bacteria(细菌）start to break down the waste.A few days later after it is dealt with, the water is brought into a greenhouse filled with plants and fish.With the help of sunlight,the plants and animals remove more chemicals from the water,making it cleaner,Then the water can be reused for washing or bathing __62__ but the water is clean enough for watering the flowing, washing the dog, or even for bathing or swimming.The advantage of this technology is that it is affordable and good for the environment.__63__.It can help to use less fresh water, and it can help keep the water supply unpolluted.A.If enough homes and businesses use “Living Machines” B.People like to plant trees around their houses C.He is also interested in saving money D.It cannot be used for drinking or cooking E.The “Living Machine” is a system for cleaning wastewater

八、阅读短文，根据短文内容回答问题。（共10分，每小题2分）

Every year, wildfires(野火)destroy much forest land.homes are broken down, and thousands of people die.smokejumpers are stop help ing to stop this.Smokejumpers are a special kind of firefight.they jump from places into areas that difficult to reach by car or on foot.they race to put out fires as fast as they can.At a fire site, Smokejumpers first examine the land and decide how to fight the fire.their main goal is to stop fire from spreading.using basic tools such as shovels and axes, smokejumpers clear land of burnable material like plants and other dry material.they carry water with them too, but not much.Although most smokejumpers are men, more women are joining.M ost important are your weight and height.Smokejumpers in the U.S.for example ,must be 54 to 91 kilograms, so they don’t get hurt when they land, or get blown by strong winds.Smokejumpers must be able to live in the wild erness.in Russia ,many smokejumpers know how to find food in the forest and even make simple furniture from trees.They work is dangerous, the hours are lo ng.But for these firefighters, smokejumpers isn’t just a job.They love being able to jump out of planes, fight fires, and live in the forest.As 28-year-old Russian smokejumpers Alexi Tishin says,“This is the best job for the strong and brave.” 64.What are Smokejumpers? 65.Where do the jump from? 66.What’s their main goal?

67.Why should they have proper weight? 68.What’s needed to be a smokejumpers? 书面表达（共25分）

九、完成句子。（共10分，每小题2分）根据中文意思完成句子。69.很抱歉我没能参加你的生日晚会。_____for missing your birthday party.70.你在课余时间喜欢读书吗？ Do you _____ in your spare time? 71.杰克会和同学们相处得很好。Jack will _____ his classmates.72.这个演讲非常精彩。我们都听得很认真。The speech _____ we all listened carefully.73.他们很难在这么短的时间内想出新的办法。_____ a new way in such a short time.十、文段表达。（共15分）

根据中文和英文提示词语，写出意思连贯、符合逻辑、不少于60词的短文，所给英文提示词语仅供选用，请不要写出你的真实校名和姓名。

74.生活中每个人都有过与他人分享的体验，如分享一本有趣的书、一段难忘的经历、一个闪光的想法„„

现在，某英文报纸就分享（Sharing）话题征文，请你投稿。描述一次你与他人分享的经历，并谈谈你的感受。

提示词语：share„with„;experience;interest;learn;change;encourage;enjoy;happiness;confident

参考答案

一、听对话，选图

1、C2、B3、A4、C

二、听对话或独白，选答案

5、A6、B7、C8、A9、A10、B11、B12、C

13、A14、B15、C16、C

三、听对话，记录关键信息

17、Appleman 18.four months

19.Monday 20.evening 21.315

四、22、A23、B24、C25、C26、C27、D28、B29、A

30、A

31、D32、D33、B34、A

五、35、A36、D37、C38、C39、A40、A41、C42、B43、D

44、B45、D46、B 阅读理解

六、47、C48、B49、A50、C51、D52、C53、D54、B55、A

56、D57、D58、B59、A

七、60、C61、E62、D63、A

八、64、Smokejumpers are a special kind of firefighter.65.They jump from planes.66.Their main goal is to stop a fine from spreading.67.Because they won’t get hurt when they land ,or get blown by strong winds.68.To be a smokejumper,one needs to have proper height and weight, be able to live in the wilderness and love his/her job.书面表达

九、69.I am sorry 70.like reading 71.get along/on well with 72.was so wonderful that 73.It’s difficult for them to come up with

十、文段表达

74.One possible version

I had an experience of sharing.When my family moved, I had to go to a new school and study in a new class.The first test made me so nervous that I failed.I got worried and felt helpless until one of my new classmates came up t o me and asked softly if I was OK.After I told him about my problem, he gave me some advice.From then on, we got to know each other and shared our ideas ,problems, and happiness.We became good friends.Sharing with friends helped me bring back my confidence and fit in with others.

第四篇：长江九年级数学寒假作业答案

长江九年级数学寒假作业答案

一、选择题

1.（江苏省常州市2002年2分）以长为3cm，5cm，7cim，10cm的四条线段中的三条线段为边，可以构成三角形的个数是【

】 A.1个

B.2个

C.3个

D.4个 【答案】B。

【考点】三角形三边关系。

【分析】从4条线段里任取3条线段组合，可有4种情况，看哪种情况不符合三角形三边关系，舍去即可：

首先进行组合，则有3，5，7；3，5，10；3，7，10；5，7，10四种情况，根据三角形的三边关系，则其中的3，5，10和3，7，10不能组成三角形。故选B。2.（江苏省常州市2004年2分）下列命题中错误的命题是【

】（A）的平方根是

（B）平行四边形是中心对称图形（C）单项式 与 是同类项（D）近似数 有三个有效数字 【答案】C。

【考点】平方根，平行四边形的性质，同类项，近似数和有效数字。【分析】A、也就是9，9的平方根是±3，正确，故本选项正确；

B、平行四边形是中心对称图形，对角线的交点是对称中心，故本选项正确； C、单项式 与 是相同字母的次数不同，不是同类项，故本选项错误； D、近似数3.14×103有三个有效数字，正确。故选C。

3.江苏省常州市2004年2分）如图，在△ABC中，DE∥BC，DE分别与AB、AC相交于点D、E，若AD=4，DB=2，则AE︰EC的值为【

】

（A）0.5

（B）2

（C）

（D）

【答案】B。

【考点】平行线分线段成比例。

【分析】∵DE∥BC，∴AD：DB=AE：EC。

而AD=4，DB=2，∴AE：EC=AD：DB=4：2=2。故选B。

4.（江苏省常州市2005年2分）如图，已知AB∥CD，直线 分别交AB、CD于点E、F，EG平分∠BEF，若∠EFG=40°，则∠EGF的度数是【

】

A、60°

B、70°

C、80°

D、90° 【答案】B。

【考点】平行线的性质，角平分线的定义。

【分析】根据两直线平行，同旁内角互补可求出∠FEB，然后根据角平分线的性质求出∠BEG，最后根据内错角相等即可解答： ∵AB∥CD，∴∠BEF+∠EFG=180°。又∠EFG=40°，∴∠BEF=140°。

∵EG平分∠BEF，∴∠BEG= ∠BEF=70°。∴∠EGF=∠BEG=70°。故选B。

5.（江苏省常州市2006年2分）锐角三角形的三个内角是∠A、∠B、∠C，如果，，那么、、这三个角中【

】

A．没有锐角

B．有1个锐角

C．有2个锐角

D．有3个锐角 【答案】A。

【考点】三角形的外角性质。

【分析】根据三角形的外角和锐角三角形的性质作答：

∵锐角三角形中三个角∠A、∠B、∠C都是锐角，而由题意知，、、分别是其外角，∴根据三角形外角的性质，可知、、这三个角都是钝角。故选A。

6.（江苏省常州市2007年2分）下列轴对称图形中，对称轴的条数最少的图形是【

】 A．圆

B．正六边形

C．正方形

D．等边三角形 【答案】D。

【考点】轴对称图形。

【分析】根据轴对称图形的概念求解：

A、圆有无数条对称轴；B、正六边形有六条对称轴；C、正方形有四条对称轴；D、等边三角形有三条对称轴。故选D。

二、填空题

3.（江苏省常州市2002年1分）将两块直角三角尺的直角顶点重合为如图所示的形状，若∠AOD=1270，则∠BOC=

▲

.【答案】53。

【考点】余角的性质。

【分析】因为两直角直角的顶点重合于点O，由∠AOD=127°可求得∠AOC的值，再根据角与角的关系转换求解：

∵∠AOD=∠AOC+∠DOC=∠AOC+90°=127°，∴∠AOC=37°。又∵∠AOC+∠BOC=37°+∠BOC=90°，∴∠BOC=53°。

4.（江苏省常州市2003年2分）光线以图所示的角度α照射到平面镜Ⅰ上，然后在平面镜Ⅰ、Ⅱ之间来回反射，已知∠α=60°，∠β=50°，∠γ=

▲

度。

【答案】40。

【考点】跨学科问题，反射的性质，平角定义，三角形内角和定理。【分析】利用反射的性质得到入射光线与水平线的夹角等于反射光线与水平线的夹角、平角定义和三角形内角和定理来求解： 如答图所示，根据反射的性质，得

∠BAC=∠α=60°，∠ABC=180°－2∠β=80°，∠ACB=∠γ。在△ABC中，∠BAC＋∠ABC＋∠ACB=180°，则

∠ACB=180°－（∠BAC＋∠ABC）=40°，即∠γ=40°。

5.（江苏省常州市2004年2分）若∠α的余角是30°，则∠α=

▲

°，sinα=

▲。

【答案】60。

【考点】余角，特殊角的三角函数值。

【分析】根据余角的定义求得α的值，再求它的正弦值：

∵∠α的余角是30°，∴∠α=90°－30°=60°，∴sianα=sian60°=。

6.（江苏省常州市2006年2分）若 的补角是120°，则 ＝

▲

°，▲

。【答案】60。

【考点】补角，特殊角的三角函数值。

【分析】根据补角的概念求出 的值，再根据特殊角的三角函数值求解即可： ∵ 的补角是120°，∴ =180°－120°=60°，∴。

7.（江苏省常州市2006年1分）如图，小亮从A点出发，沿直线前进10米后向左转30°，再沿直线前进

10米，又向左转30°，……照这样走下去，他第一次回到出发地A点时，一共走了

▲

米。

【答案】120。

【考点】平角定义，多边形内角和定理。

【分析】根据题意，小亮这样走法形成一个正多边形，由平角定义，知正多边形的每个内角等于1500。

∴根据多边形内角和定理，得，解得。

∴照这样法，他第一次回到出发地A点时，一共走了12×10=120米。

8.（江苏省常州市2007年2分）若，则 的余角是

▲

°，▲

． 【答案】60：。

【考点】余角，特殊角的三角函数值。

【分析】根据互余的性质和特殊角的三角函数值计算：的余角是90°－ =90°－30°=60°： cosα=cos30°=。

9.（江苏省常州市2008年2分）如图，在△ABC中BE平分∠ABC，DE∥BC，∠ABE=35°，则

∠DEB=______°，∠ADE=

▲

°.【答案】35；70。

【考点】角平分线的定义，平行线的性质。

【分析】利用平行线的性质及角平分线的定义即可求出：

∵在△ABC中，BE平分∠ABC，∠ABE=35°，∴∠ABC=70°，∠EBC=35°。∵DE∥BC，∴∠DEB=∠EBC=35°；∠ADE=∠ABC=70°。

10.（2011江苏常州2分）若∠ 的补角为120°，则∠ =

▲，Sin =

▲。

【答案】600。

【考点】补角，特殊角的三角函数。

【分析】利用补角和600角的正弦，直接得出结果：根据补角定义，∠α＝180°—120°＝60°，于是sinα＝sin60°＝。11.（2012江苏常州2分）若∠α=600，则∠α的余角为

▲，cosα的值为

▲

。【答案】300。

【考点】余角定义，特殊角的三角函数值。【分析】根据余角定义，∠α的余角为900－600=300；由特殊角的三角函数值，得cosα=。

三、解答题

1.（江苏省常州市2002年7分）如图，它是由6个面积为1的小正方形组成的矩形，点A，B，C，D，E，F，G是小正方形的顶点，以这七个点中的任意三个点为顶点，可组成多少个面积为1的三角形？请你写出所有这样的三角形？

【答案】解：由题意得符合条件的三角形高是1，对应的底是2，或高是2，对应的底是1，因此，以点A，B，C，D，E，F，G中的任意三个点为顶点，可组成多少个面积为1的三角形共有14个，它们是：△ADE，△AEF，△AFG，△BDE，△BEF，△BFG，△ABD，△ABE，△ABF，△ABG，△CDF，△CEG，△CBF，△CAG。【考点】三角形的面积。

【分析】根据三角形的面积公式，观察图形，只要保证该三角形的高是1，对应的底是2，或高是2，对应的底是1，即可。在列举时，宜采用字典排列法。

2.（江苏省常州市2004年8分）用水平线和竖直线将平面分成若干个边长为1的小正方形格子，小正方形的顶点，叫格点，以格点为顶点的多边形叫格点多边形。设格点多边形的面积为S，它各边上格点的个数和为。

（1）上图中的格点多边形，其内部都只有一个格点，它们的面积与各边上格点的个数和的对应关系如下表，请写出S与 之间的关系式。答：S=

。多边形的序号 ① ② ③ ④ … 多边形的面积S 2 2.5 3 4 … 各边上格点的个数和5 6 8 …

（2）请你再画出一些格点多边形，使这些多边形内部都有而且只有2格点。此时所画的各个多边形的面积S与它各边上格点的个数和 之间的关系式是：S=。

（3）请你继续探索，当格点多边形内部有且只有 个格点时，猜想S与 有怎样的关系？答：S=

。【答案】解：（1）。

（2）画格点多边形如下：

+1。

（3）。

【考点】分类归纳(图形的变化类)，网格问题，正方形的性质。【分析】（1）由表可以直接得到。

（2）当多边形内部都有而且只有2格点，它们的面积与各边上格点的个数和的对应关系如下表：

多边形的序号 ① ② ③ ④ ⑤ …

多边形的面积S 2.5 3 3.5 4 4.5 … 各边上格点的个数和4 5 6 7 …

可见，这时所画的各个多边形的面积S与它各边上格点的个数和 之间的关系式是：S= +1

第五篇：长江寒假作业九年级数学答案

长江寒假作业九年级数学答案

1、如图，火车匀速通过隧道（隧道长大于货车长）时，火车进入隧道的时间与火车在隧道内的长度之间的关系用图象描述大致是

（）

2、抛物线 的对称轴是

（）(A)直线x＝1

(B)直线x＝3

(C)直线x＝－1

(D)直线x＝－3

3、已知二次函数，当b从-1逐渐变化到1的过程中，它所对应的抛物线位置也随之变动．关于抛物线的移动方向的描述中，正确的是（）

A．先往左上方移动，再往左下方移动

B．先往左下方移动，再往左上方移动 C．先往右上方移动，再往右下方移动

D．先往右下方移动，再往右上方移动

4、已知函数 的图象与x轴有交点，则k的取值范围是（）

5、若二次函数（a，b为常数）的图象如图，则a的值为（）

A.1

B.C.D.-2

6、二次函数 的图像可以由二次函数 的图像平移而得到，下列平移正确的是

（）A.先向左平移2个单位，再向上平移1个单位 B.先向左平移2个单位，再向下平移1个单位 C.先向右平移2个单位，再向上平移1个单位 D.先向右平移2个单位，再向下平移1个单位

7、已知：a>0，b<0，c<0，则二次函数 的图像可能是（）

A

B

C

D

8、已知a=－1，点（a－1，y1），（a，y2），（a+5，y3）都在函数 的图象上，则

()

A．y1

B．y1

C．y3

D．y2

9、如图，一条抛物线与x轴相交于A、B两点，其顶点P在折线C－D－E上移动，若点C、D、E的坐标分别为（-1，4）、（3，4）、（3，1），点B的横坐标的最小值为1，则点A的横坐标的最大值为（）

A、1

B、2

C、3

D、4

第9题

第10题

10、如图6，抛物线 与 交于点A(1，3)，过点A作x轴的平行线，分别交两条抛物线于点B、C．则以下结论：

①无论取何值，的值总是正数． ②．a=1 ③当x=0时，． ④．2AB=3AC 其中正确结论是（）

A．①②

Ｂ．②③

Ｃ．③④

Ｄ．①④

11、将抛物线 先向左平移2个单位，再向下平移3个单位，那么所得抛物线的函数关系式是（）A．

B．

C．

D．

二、解答题

12、直线 与坐标轴分别交于A、B两点，动点P、Q同时从点O出发，同时到达点A，运动停止．点Q沿线段OA运动，速度为每秒1个单位长度，点P沿路线O→B→A运动．（1）直接写出A、B两点的坐标；

（2）设点Q的运动时间为t秒，的面积为s，求出s与t之间的函数关系式，并求出t的取值范围；

13、如图,抛物线 经过点A(1,0)和点P(3,4).(1)求此抛物线的解析式,写出抛物线与x轴的交点坐标和顶点坐标.(2)若抛物线与轴的另一个交点为B,现将抛物线向射线AP方向平移,使P点落在M点处,同时抛物线上的B点落在点D（BD∥PM）处.设抛物线平移前P、B之间的曲线部分与平移后M、D之间的曲线部分，与线段MP、BD所围成的面积为m, 线段 PM的长度为n,求m与n的函数关系式.14、如图，有长为24m的篱笆，一面利用墙（墙的最大可用长度a为10m），围成中间隔有一道篱笆的长方形花圃．设花圃的宽AB为x m，面积为S ．

（1）求S与x的函数关系式；

（2）如果要围成面积为45 的花圃，AB的长是多少米？

（3）能围成面积比45 更大的花圃吗？如果能，请求出最大面积，并说明围法；如果不能，请说明理由．

15、如图，在平面直角坐标系中，直线y=-2x+42交x轴与点A,交直线y=x于点B,抛物线 分别交线段AB、OB于点C、D，点C和点D的横坐标分别为16和4，点P在这条抛物线上．（1）求点C、D的纵坐标．

（2）求a、c的值．

（3）若Q为线段OB上一点，且P、Q两点的纵坐标都为5，求线段PQ的长．

（4）若Q为线段OB或线段AB上的一点，PQ⊥x轴，设P、Q两点之间的距离为d（d＞0），点Q的横坐标为m，直接写出d随m的增大而减小时m的取值范围．

16、如图，矩形ABCD的两边长AB=18cm，AD=4cm，点P、Q分别从A、B同时出发，P在边AB上沿AB方向以每秒2cm的速度匀速运动，Q在边BC上沿BC方向以每秒1cm的速度匀速运动．设运动时间为x秒，△PBQ的面积为y（）.（1）求y关于x的函数关系式，并写出x的取值范围；（2）求△PBQ的面积的最大值.17、如图，在△AOB中，，矩形CDEF的顶点C、D、F分别在边AO、OB、AB上。（1）若C、D恰好是边AO，OB的中点，求矩形CDEF的面积；（2）若，求矩形CDEF面积的最大值。

18、对于三个数a,b,c，用M{a,b,c}表示这三个数的平均数，用min{a,b,c}表示这三个数中最小的数．例如：

； ；

解决下列问题：

（1）填空： =

；如果，则x的取值范围为 ．（2）①如果，求x的值；

②根据①，你发现了结论“如果，那么

（填a,b,c的大小关系）”．证明你发现的结论；

③运用②的结论，填空：

，则x+y=

．

（3）在同一直角坐标系中作出函数y=x+1，y=2-x的图象（不需列表描点）．通过观察图象，填空： 的最大值为

．

19、如图，已知抛物线 的对称轴为直线x＝1，且抛物线经过A(－1,0)、C(0，－3)两点，与x轴交于另一点B.(1)求这条抛物线所对应的函数解析式；

(2)在抛物线的对称轴直线x＝1上求一点M，使点M到点A的距离与到点C的距离之和最小，并求出此时点M的坐标；

(3)设点P为抛物线的对称轴直线x＝1上的一动点，求使∠PCB＝90°的点P的坐标．

20、改革开放以来，某镇通过多种途径发展地方经济，1995年该镇年国民生产总值为2亿元，根据测算，该镇国民生产总产值为5亿元时，可达到小康水平。(1)若从1996年开始，该镇国民生产总值每年比上一年增加0.6亿元，该镇通过几年可达到小康水平?(2)设以2001年为第一年，该镇第x年的国民生产总值为y亿元，y与x之间的关系是 该镇那一年的国民生产总值可在1995年的基础上翻两番（即达到1995年的年国民生产总值的4倍）？

21、两个完全相同的矩形ABCD、AOEF按如图所示的方式摆放，使点A、D均在y轴的正半轴上，点B在第一象限，点E在x轴的正半轴上，点F在函数 的图象上，AB=1，AD=4．

(1)求k的值．

(2)将矩形ABCD绕点B顺时针旋转

得到矩形 ,边 交函数 的图象于点M，求 的长．

22、在梯形ABCD中，AB//CD，点E在线段DA上，直线CE与BA的延长线交于点G，（1）求证：△CDE∽△GAE;(2)当DE：EA=1：2时，过点E作EF//CD交BC于点F且 CD=4,EF=6，求AB的长

23、如图，在平行四边形ABCD中，过点A作AE⊥BC，垂足为E，连接DE，F为线段DE上一点，且∠AFE＝∠B.(1)求证：△ADF∽△DEC；

(2)若AB＝4，AD＝，AE＝3，求ED，AF的长.24、如图，一艘军舰从点A向位于正东方向的C岛航行，在点A处测得B岛在其北偏东（即），航行75海里到达点D处，测得B岛在其北偏东，继续航行5海里到达C岛，此时接到通知，要求这艘军舰在半小时内赶到正北方向的B岛执行任务，则这艘军舰航行速度至少为多少时才能按时赶到B岛？

25、已知，延长BC到D，使CD=BC．取AB的中点F，连结FD交AC于点E．（1）求 的值；（2）若，求 的长．

26、有一河堤坝BCDF为梯形，斜坡BC坡度，坝高为5 m，坝顶CD = 6 m，现有一工程车需从距B点50 m的A处前方取土，然后经过B—C—D放土,为了安全起见，工程车轮只能停在离A、D处1 m的地方即M、N处工作，已知车轮半经为1 m，求车轮从取土处到放土处圆心从M到N所经过的路径长。（）

27、如图，某种新型导弹从地面发射点L处发射，在初始竖直加速飞行阶段，导弹上升的高度y（km）与飞行时间x（s）之间的关系式为（0≤x≤10）．发射3s后，导弹到达A点，此时位于与L同一水平面的R处雷达站测得AR的距离是2km，再过3s后，导弹到达B点．（1）求发射点L与雷达站R之间的距离；

（2）当导弹到达B点时，求雷达站测得的仰角（即∠BRL）的正切值．

28、如图，为测量江两岸码头B、D之间的距离，从山坡上高度为50米的A处测得码头B的俯角∠EAB为15°，码头D的俯角∠EAD为45°，点C在线段BD的延长线上，AC⊥BC，垂足为C，求码头B、D的距离（结果保留整数）．

29、如图，A，B两座城市相距100千米，现计划要在两座城市之间修筑一条高等级公路（即线段AB）。经测量，森林保护区中心P点在A城市的北偏东30°方向，B城市的北偏西45°方向上。已知森林保护区的范围在以P为圆心，50千米为半径的圆形区域内，请问：计划修筑的这条高等级公路会不会穿越保护区？为什么？

30.如图，在矩形 中，．点 在 上，交 于，交于 于 ．点 从 点（不含）沿 方向移动，直到使点 与点 重合为止．

（1）设，的面积为 ．请写出 关于 的函数解析式．（2）点 在运动过程中，的面积是否有最大值，若有，请求出最大值及此时 的取值；若无，请说明理由．