初一上册寒假科学作业答案

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第一篇:初一上册寒假科学作业答案

第二章

空气

预习作业 2.1 1.无

质量

2.把一个瓶子倒置于水中(不能斜放),谁不会流入瓶中;如向下压,会感到一股阻力,说明有空气存在。

3.冬天装有暖气片,暖气片安装在房间下部,当暖气来的时候,下部空气温度升高,密度降低,所以暖空气上升,形成对流。6.大气层

大气压

7.1235 8.用气压计测量;是科学家托里拆利。2.2 1.混合物

21 0.03

2.白烟

上升

1/5 氧气

1/5 3.氦

不活泼

飞艇

气球 4.B 5.氮气

氧气

其他气体

6.液化空气

氮气

液氧

蓝 7.21 78 200 234 8.C 2.3 1.很高

很低

一般

2.氯酸钾

高锰酸钾

过氧化氢 3.催化

加快

4.过氧化氢——氧气+水 5.排水

难溶或微溶于水 6.氮气

氧气

排水

7.过氧化氢——氧气+水

催化剂

加快过氧化氢的 8.排水法

向上排空气法

9.物理性质

化学性质

物理性质

化学性质 10.无

不易

物理 11.复燃

12.燃烧

缓慢氧气

“燃烧” 13.活泼

非金属

14.氮气

氧气

稀有气体

二氧化碳

其他气体和杂质

用排水法 15.铁丝

蜡烛

木炭

硫磺

木条

16.(横的)无色

大于空气

气体

不易溶于水

无味

支持燃烧 17.发热

发光

剧烈化学

着火点 18.可燃物

温度

空气

不能

19.油锅着火,盖上锅盖

建筑物着火,用高压水枪喷水灭火

喷射干冰灭火 20.泡沫灭火器

干粉灭火器

液态二氧化碳灭火器 2.4 1.空气

0.03 高

吸收 2.无

大 3.1 多 4.无

固态二氧化碳

5.氧气

二氧化碳

降低

增多 6.不能

不能

7.澄清的石灰水变浑浊

二氧化碳+氢氧化钙——碳酸钙+水

氢氧化钙

碳酸钙

水 8.酸碱指示剂

9.石灰石

稀盐酸

碳酸钙+盐酸——氯化钙+二氧化碳+水 10.排水法

向上排气法

向下排气法

11.23451 2.5 1.21% 78% 0.03% 2.生存

腐烂

光合作用

灭火

霓虹灯 3.臭氧

臭氧

氟氯烃

氮氧化物

4.二氧化碳

氮氧化碳

灰尘

烟尘

雾 5.技术

煤气或液体燃料

工艺

6.污染指数

首要污染物

环境空气质量等级 第六章

物质的结构

预习作业 6.1 1.分

分子

原子

离子

2.化学

4.原

2个氢原子

1个氧原子 5.2 氢 氧 氢 氧 6.道尔顿

阿伏伽德罗

汤姆生 7.离

8.原子核

核外电子 9.质子

中子

夸克 10.核外电子数 11.空隙

相互 二

元素 1.元素 2.元素

4.氢

5.(横的)H He C N O Ne Na Mg AI Si Zn I Br Pb Hg Ag 6.单质

金属

非金属 7.化合物 8.纯净物 9.混合物

物质的变化与性质 1.没有 2.有

5化学

颜色

气味

状态

硬度

熔点

沸点

密度6.化学

物质的可燃性

酸性

碱性 7.有确定的没有确定的

8.(横的)最大

较差

较小

良好

P S CI K Ca Mn Fe 溶解性

导电性

导热性 Cu

寒假作业1 C

A

A

B

D

C

C

B

D

A

D

C

B

C

D

C

D

D

A

A

C

D

C

B

C

D

D 28.4

植物——兔——鹰

数量急速降少 29.234 哺乳 30.冬

极昼

31.6月21日或22日

春分 32.稳定

简单

33.自然生态系统

半人工生态系统

人工生态系统 34.生物圈

水圈 35.森林

灌木层

36.正确

蚊子可水陆两栖,符合两栖动物的特征之一 37.双子叶

樟树为直根系,有两枚子叶,叶呈网状叶脉 38.肉汤变质是否是有空气中的细菌引起的 39.白色

应激性 40.3 2

41.昆虫

外骨骼 42.26.8℃

42℃ 寒假作业2 D

C

D

C

D

C

B

A

A

A

C

D

B

D

B

B

B

A

A

A

D

A

A

A

C

C

D 28.热胀冷缩

物质

太阳

天文望远镜

cm

m 29.d a b c a 30.12 夏季

极夜

31.观察

实验

建立假设

分解者

遗传多样性 32.变小

气温变低

33.这个被测物的实际质量为46.7g。

34.能快速适应环境

导致水中生物应缺氧而大量死亡,甚至还堵塞河道

可作为猪饲料

随意引进外来物种,会使整个生态系统遭到破坏,而生物体就会受害或死亡 35.分解者 绿色植物——食草昆虫——蛙——蛇——鹰

第二篇:初一上册寒假生活指导答案

I.听力部分(每题1分,满分20分)A)听对话选择正确的图片。(听两遍)1.Where does Jack come from? A.B.C.2.Where is the dog? A.B.C.3.Where does the woman chat with his mother? A.B.C.4.What is Madee doing now? A.B.C.B)听对话回答下列问题,选择正确答案。(听两遍)5.When is Daniel going to help Helen with her English?

A.This morning.B.This evening.C.Tomorrow morning.6.Where are they?

A.In the shop.B.At home.C.In the restaurant.7.Why does Mike like winter best?

A.Because he likes snow.B.Because he enjoys skating.C.Because he enjoys swimming.8.How many students are there in Class One?

A.Twenty-three.B.Forty-three.C.Forty-one 9.How often does Millie hear from her Australian friend? A.Once a week.B.Once a month.C.Twice a month.C)听对话回答下列问题

听第一段对话,回答第10-12小题.

l0.Which season does the man like best?

A.Spring.B.Winter.C.Summer.11.When does the summer holiday finish?

A.In July.B.In August.C.In September.12.What does the man like to do in summer?

A.Go shopping with his uncle.B.Swim with his uncle.C.Play with his uncle.听第二段对话,回答13-15小题

13.What does the man want to buy? A.Eggs.B.Apples.C.Bananas.14.How much is the lantern?

A.23 yuan.B.22 yuan.C.32 yuan..15.Are there any bookshops in this shopping mall? A.Yes, there is one.B.No, there aren‟t.C.Yes, there is some.听短文,回答第16-20小题。16.Joan is from ________.A.China B.Japan C.the USA 17.Joan likes speaking ________with us after class.A.Chinese B.English C.Japanese 18.Joan's ________ is an English teacher.A.father B.mother C.father‟s brother 19.How often does Joan go to the shop?

A.Often.B.Every Sunday.C.Sometimes.20.How many people are there in Joan‟s family? A.Four.B.There.C.Two.Ⅱ.单项选择(从四个选项中找出最佳答案 每题1分,满分20分)21.My favourite pet is _____cat.______fur is grey and white.A.a...Its B.the....its C.the...It‟s D.a...A

22.---does Mary usually go to the buddy club?---Once a week.A.How often B.How long C.How far D.How much

23.The boy always looks.Now he‟s looking at his new drawing.A.happy;happily B.happy;happy C.happily;happily D.happily;happy 24.What‟s your best friend like? A.He is fine.Thank you.B.He looks like a doctor.C.He likes making friends.D.He is helpful and generous.25.Chinese students have weeks in the summertime than American students.A.more;on B.fewer;on C.more;off D.less;off 26.There an exciting softball match on TV this evening.A.will have B.are going to have C.are going to be D.is going to be 27.There are many tall buildings on of the busy street.A.both side B.all sides C.each side D.every side 28.I have friends than you, but I have true friends than you.A.more;more B.less;more C.fewer;more D.more;less 29.If you live near the shopping mall, you go far to buy things.A.have to B.haven‟t to C.don‟t have to D.needn‟t to

30._______ Tim‟s help, I found my pet dog in the end.I should say thanks to him.A.Along with B.Without C.Thanks to D.Because

31.Only two of the students worked the maths problem out correctly.______ all did it wrong.A.Other B.Others C.The other D.The others

32.---David, your mother‟s birthday is _____.Let‟s think about how to celebrate it.---OK, Dad.A.coming up B.picking up C.closing down D.looking up

33.---Because the petrol(汽油)price is going up , ________people will choose to own a car, I think.---I have the same idea as you.A.more and more B.fewer and fewer C.less and less D.less and fewer 34.There few great changes in our city 10 years ago.A.were B.had C.was D.are

35.---Why didn‟t you arrive there until three days later?

---Because the heavy rain added to_____ of the journey(旅程).A.the difficulties B.more difficult C.the most difficult D.the difficult 36.---How was your interview(采访)last Monday?---____.A.Not at all B.It was OK C.That‟s right D.Good luck

37.---You don‟t like rock music, do you?---_________.I think it is too noisy.A.Yes, I do B.No, I don‟t C.Yes, I don‟t D.No, I do 38.Lucy is _______ of the twins.A.slimmer B.slimmest C.the slimmer D.the slimmest 39.Vivien has a good sense of humour.She is very good _______telling jokes.A.to B.for C.in D.at

40.The 2012 American action film „The Expendables 2‟makes me ______great.A.felt B.feel C.feeling D.to feel

三、完形填空(共15小题;每小题1分,满分15分)

From Monday to Friday most people are busy working or studying, but in the evenings and at weekends they are free and like to __41__ themselves.Some watch television or go to the cinema, others __42__ sports.This is decided by their own __43__.There are many different ways to spend our __44__ time.Almost everyone has some kind of __45__: it may be something from collecting stamps to __46__ model planes.Some hobbies are very __47__, but others don‟t cost anything at all.Some collections are worth(值)__48__ of money, others are valuable(有价值的)only to their owners.I know a man has a coin collection.It is worth several dollars.A short time ago he bought a rare(罕见的)fifty-cent piece.It __49__ him $250!He was very happy about this collection and thought the price was all right.On the other hand, my youngest brother collects match boxes.He has almost 600 of them, but I want to know__50 __ they are worth any money.However, __51__ my brother they are quite valuable.__52__ makes him __53__ than to find a new watch box for his collection.That‟s what a hobby means, I think.It is something we 54 to do in our free time just for the 55 of it.The value in dollars is not important, but the pleasure it gives us is.41.A.love B.work C.enjoy D.play

42.A.look like B.take care of C.think about D.take part in 43.A.lives B.interests C.jobs D.things 44.A.working B.free C.own D.whole 45.A.hobby B.thing C.makes D.way 46.A.sending B.making C.eating D.looking 47.A.interesting B.exciting C.cheap D.expensive 48.A.a little B.a few C.a lot D.a number 49.A.paid B.cost C.took D.spent 50.A.that B.if C.what D.in 51.A.to B.on C.with D.in 52.A.Everything B.Anything C.Nothing D.Something 53.A.happier B.worse C.more happily D.happiness 54.A.have B.need C.refuse D.like 55.A.money B.work C.fun D.time

四、阅读理解(共15小题;A篇每题2分,B、C篇每题1分,共20分)

A

John is 14 years old.He is a student of Grade Eight.He was a very active and happy boy two years ago.But everything changed after he started to play computer games.He never plays basketball or football with his friends any more.And when he sits in the classroom, he can‟t listen to the teachers.He sleeps in class.And he spends less and less time in studying.So he gets bad scores in tests.But he is very different after school is over.He stays in the net bar until it is closed.Ah, he loses himself in computer games.His parents can do nothing to stop him.Every morning in the school, when we see that he is so tired after a night‟s “busy working”, we really feel sad.He is too tired!

56.John was ______two years ago.A.sad and unhealthy B.active but bored C.active and happy D.healthy but sad 57.John changed a lot because ________.A.he couldn‟t get good grades B.he played computer games C.he had to work for money D.he didn‟t exercise any more 58.Every morning John feels ________.A.tired B.healthy C.happy D.relaxed 59.John _______ plays basketball with his friends now.A.seldom B.often C.always D.never 60.Which of the following is TRUE?

A.John wasn‟t a good student two years ago.B.John often sleeps in class at school.C.John‟s parents don‟t love him.D.John is busy working every day.B

China Youth says that more and more girl students have come into colleges(大学)to study in the recent few years.As we know, once the number of boys was larger than that of girls and boys did much better than girls in our country for a long time.Now, things have changed a lot.In recent years, the proportion of girl students is growing fast.In 1998, about 39.7% of college students were girls.In 2000, it was 41.07% and in 2001, the number was 42.14%.There are several reasons for this.Firstly, there is little difference between boys and girls in their intelligence(智力).That‟s to say, girls are as clever as boys.And boys have more interests than girls, so they may not always do well in their study.Secondly, girls are more careful than boys.They work harder at school and they do better in all exams.Another reason is that with the development of society, people pay more and more attention(注意力)to girls‟ education.61.China Youth says that more and more ______.A.boys are clever than girls B.boys can‟t go to school

C.girls have come into colleges D.girls begin to study at school 62.42.14% refers to(指)the number of ______.A.girls at schools in 1998 B.girls in colleges in 200

1C.boys at schools in 2001 D.boys in colleges in 1998 63.The writer gave us ______ reasons to explain the question.A.two B.three C.four D.five

64.What does the underlined word “proportion” mean in Chinese?

A.成绩 B.比例 C.特性 D.速度 65.Which of the following sentences is TRUE?

A.Boys may not do well in their study as girls because they don‟t like studying.B.Boys are much cleverer than girls because they‟re interested in many things.C.Girls‟ intelligence is the same as boys‟.D.Girls study harder, but they couldn‟t get higher marks than boys.C

There are about fifteen hundred languages in the world.But only a few of them are very important.English is one of them.Many, many people use it, not only in England and the USA, but also in other parts of the world.About 200,000,000 people speak it as their own language.It is difficult to say how many people are learning it as a foreign language.Many millions of people are trying to do so.Is it easy or difficult to learn English? Different people may have different answers.Have you ever noticed advertisements of this kind in the newspapers or magazines? “Learn English in six weeks, or give your money back…” “Easy and funny…” “Our records and tapes help you master English in a month”.Of course, it never happened quite like that.The only language that seems easy to learn is the mother tongue.We should remember that we all learned our own language well when we were children.If we could learn English in the same way, it would not seem so difficult.Think of what a small child does.He listens to what people say.He tries what he hears.So it is hard to say that learning English is easy.We must do a lot of practice.And practice needs great efforts and takes much time.Good teachers, record, tapes, books, and dictionaries will be helpful, but they cannot do the student‟s work for him.66.How many languages are very important in the world?

A.A few.B.Few.C.About 1500.D.Many.67.If we want to learn English well, what shall we do?

A.We should study it without any help.B.We must do a lot of practice.C.We need to get much money back.D.We must live in England or America.68.How does the writer like the advertisements in the newspapers or magazines? A.He thinks the advertisements very expensive.B.He thinks the advertisements are true.C.It never happened quite like what the advertisements said.D.He believes” Learn English in six weeks, or give your money back”.69.Which language is easy to learn?

A.English B.Chinese C.Japanese D.The mother language 70.Which countries use English as the mother tongue? A.China and France.B.Japan and Italy.c.England the America.D.Germany and France.第II卷(75分)

一、选择正确的词组完成下列句子。(每题1分,满分7分)

the fastest runner becomes famous make friends with as much as as well the same as the most points is ready to 1.I really want to ______________ my new classmates at the new school.2.Do you miss me _________I miss you?

3.The 25-year-old Bolt is _____________in the 100 metres.4.Mo Yan __________ all over the world after receiving 2012 Nobel Prize in Literature.5.During the Reading Week, I want to read all our classmates‟ books_________.6.Ninth grade in the USA is __________Grade 9 in China.7.I hope you will score ____________ in the English exam in your class.二、根据句子意思,用括号中所给单词的适当形式填空。(每题1分,满分12分)1.Tom‟s father is teaching his parrot ____________(speak)in the house.2.We should not__________(study)for the study in word.3.Simon has __________(little)orange juice than Millie.4.Do you often practice___________(ski)here in winter?

5.Peter from Australia is the___________(tall)of the six foreign teachers.6.Many teenagers are willing to ________(give)their seats to people in need on bus.7.We always have a good time_______(talk)to each other at lunch time at school 8.Happiness is sometimes just staying in your bed, eating pizza and _______(watch)television all day.9.Many _______(hero)in the history books have secrets.10.But to his dying day, he could never solve the problem______(correct).11.Betty wants to be a _______(sing)like his mother when she grows up.12.The new student hopes I can give him some ___________(advice).三、根据汉语提示完成下列各句(每题最少两词,每题2分,满分16分)1.这个女孩总是带着微笑,看上去很开心。

The girl always __________________and looks happy.2.我听说吴先生今晚将要上电视。I hear Mr.Wu is going to___________ tonight.3.我爸爸正在学如何做健康美味的饭菜。

My father is learning ____________healthy and tasty meals.4.今年我们学的科目比他们学的少。

We study________________ than they do this year.5.放学后我常和我的伙伴们打一小时篮球。

I often spend one hour _______________with my buddies after school.6.在午餐时间,他总是独自坐着读着书。

During lunchtime, he always _______________and reads books.7.戴眼镜的漂亮女孩是美国歌手、舞者、演员布兰妮。

The beautiful girl _______________is the American singer, dancer and actress Britney.8.他视力不好是因为夜晚在电脑上工作太多。

He has poor eyesight ___________working on the computer too much at night.四、.阅读短文(共2篇;每小题2分,满分20分)A

One afternoon, Mr.Dickens went out for a walk at the side of a river.He saw a fisherman on the bank of the river.So he stopped to watch him quietly.After a few minutes, the fisherman pulled his line in.There was a

big, fat fish at the end of it.The fisherman took it off the hook(鱼钩)and threw it back into the water.Then he put his hook and line in again.After a few more minutes he caught another big fish.Again he threw it back into the river.Then, the third time, he caught a small fish.He put it into his basket and started to get ready to go home.Mr.Dickens was very surprised, so he spoke to the fisherman.He said, “Why did you throw those beautiful, big fish back into the water, and keep only that small one?” The fisherman looked at Mr.Dickens and answered, “My pan is too small!” 根据文章内容回答下列问题。

1.Why did Mr.Dickens stop walking?

2.For the first time, what did the fisherman catch?

3.Did the fisherman put the first and the second fish back into the river? 4.Is the third fish bigger than the other two? 5.How was Mr.Dickens at what he saw? B

Do you know how many families in the US and Canada have pets? If you say 60%, you‟re right!Sixty percent of families have at least one pet there.What about the most popular types of pets? Does anyone know what the most popular pets are? Dogs are very popular.In fact, dogs and cats are the two most popular types of pets.Other popular pets are birds and fish.Some people have dogs, cats, birds and fish!

Do you know how pets help their owners? You probably know that people help their pets.They feed them and take care of them.But do you know that pets help their owners? Pets help their owners to feel good.People without any pets often feel lonely, especially older people.Pets can also help people‟s health.It‟s true!People with pets are healthier than people without pets.People in the United States and Canada love their pets like members of their own family.Many people let their pets sleep in their beds.And sometimes pet owners carry a picture of their pets with them.根据文章内容完成下列各句。

6._____________of families have at least one pet in the US and Canada.7.The two most popular types of pets are __________________ there.8.Pets help their owners to feel good and they can also help _________________.9.It‟s a good idea for older people __________________if they don‟t want to feel lonely..10.People in the western counties treat their pets as ______________their own family.五、书面表达(20分)

请以“My best teacher”为题,写一篇短文,来表达你对老师的感谢和喜爱。要点如下:

1.简单介绍老师的基本情况(包括性别、年龄、外貌)。

2.说明你喜欢老师的一个或两个原因,是老师的人格魅力如幽默风趣知识渊博;是老师的 精彩有趣的课堂教学;还是老师对你无微不至的关心等等,原因不限定但合情理。3.真情表述你对老师的感谢,喜爱和祝福等。

全文约80个字左右,段落分明,条理清晰,可以采用老师的真实姓名。

第三篇:六年级上册寒假数学作业答案

六年级上册寒假数学作业答案

一、选择题(本大题共5题,每小题2分,满分10分)(每题只有一个选项正确)

11、下列式子中,属于整除的是

().A、20 ÷ 2.5 = 8

B、8 ÷ 5 = 1.6

C、1.2÷0.4 = 3

D、42 ÷ 6 = 7

12、下列四个数 中,不能化成有限小数的有()个.A、1

B、2

C、3

D、4

13、下列说法正确的是:

().A、一个素数只有一个因数

B、所有偶数都是合数 C、一个合数至少有3个因数

D、素数都是奇数

14、一批玉米种子,发芽粒数与没有发芽粒数的比是4:1,这批种子的发芽率是().A、80%

B、75%

C、25%

D、20%

15、在△ABC中,∠C=90°,∠A=60°,∠B=30°,AB=2,将△ABC绕点B旋转至△A’B’C’的位置(如图),且使点A、B、C’在同一条直线上,则点A经过的路径长为()

A、B、C、D、三、填空题(本大题共10题,每小题2分,满分20分)

16、对于6、18这两个数最小的公倍数是

.17、将20分解素因数:20=_________________.

18、求比值:1.5小时:50分钟=

.19、一件服装进价为120元,售价为90元,则它的亏损率为

.20、一条弧的长度为25.12,所对圆心角为120°,那么弧所在的圆的半径为

.21、某人存入银行10000元,年利率为5%,三年后可得本息和

元.22、标有1~9数字的相同大小的纸片9张,从中抽到一张素数纸片的可能性大小为

.23、半径为3cm的半圆周长是___________cm.24、某学校对学生早上到学校的方式进行了调查,结果如图,其中A为骑自行 车上学的学生,B为乘公共汽车上学的学生,C为走路上学的学生,D为乘地 铁上学的学生,所在扇形的圆心角为15°,问其中走路上学的学生占受调查人数 的(几分之几).25、如右图,在边长为6厘米的正方形内,有四个半径相等的圆,每相 邻的两个圆仅有一个公共点,求阴影部分的面积为

平方厘米.四、计算题(本大题共5题,每小题5分,满分25分)26、27、28、29、求x的值:

30、已知,求

五、应用题(本大题共5小题,每小题6分,满分30分)

31、某工程队修一条路,12天共修780米,还剩下325米没有修。照这样速度,修完这条公路,还需要多少天?(用比例解)

32、加工一批零件,第一天和第二天各完成了这批零件的 ,第三天加工了80个,正好完成了加工任务,这批零件共有多少个?

33、要在周长为18.84米的圆形花坛外围一条宽2米的环形大理石道路,问需用大理石多少平方米?若每平米大理石需要200元,则至少该准备多少资金?

34、某冰箱厂每个月可生产A型冰箱400台,每台冰箱的成本价为2000元.现有两种销售方法:第一种,每台冰箱加价20%,全部批发给零售商;第二种,全部由厂家直接销售,每台冰箱加价25%作为销售价,每月也可售出400台,但需每月支付销售门面房和销售人员工资等费用共9500元.

问:(1)如果厂家按第一种方法销售冰箱,400台冰箱全部销售完后,厂家可获利多少元?

(2)如果你是厂长,应选择哪一种销售方法,才能获得更多的利润.请说明理由。

35、据报载,在“百万家庭低碳行,垃圾分类要先行”活动中,某地区对随机抽取的1000名公民的年龄段分布情况和对垃圾分类所持态度进行调查,并将调查结果分别绘成条形图、扇形图.

(1)图中所缺少的百分数是____________%;

(2)如果把所持态度中的“很赞同”和“赞同”统称为“支持”,那么这次被调查公民中“支持”的人有_______________名.

(3)这次随机调查中,年龄段是“25岁以下”的公民中“不赞成”的有5名,它占“25岁以下”人数的百分数是_____________;

六、解答题(本大题满分5分)

36、如图所示,∠AOB=90°,∠COB=45°,(1)已知OB=20,求以OB为直径的半圆面积及扇形COB的面积;

(2)若OB的长度未知,已知阴影甲的面积为16平方厘米,能否求阴影乙的面积?若能,请直接写出结果;若不能,请说明理由。

六年级数学第一学期期末考试参考答案 及评分标准

一、直接写出答案(本大题共10题,每题1分,满分10分)

1、;

2、; 3、22; 4、1; 5、2.3;

6、;

7、;

8、;

9、;

10、0.6

二、选择题(本大题共5题,每小题2分,满分10分)(每题只有一个选项正确)

11、D;

12、A;

13、C;

14、A;

15、D;

三、填空题(本大题共10题,每小题2分,满分20分)16、18;

17、20=2×2×5; 18、1.8或 ;

19、25%; 20、12; 21、11500;

22、;

23、15.42;

24、; 25、9;

四、计算题(本大题共5题,每小题5分,满分25分)

26、解:原式=----2分

=32-12------------2分

=20---------------1分

27、解:原式=-----------------------------2分

------2分

------------1分

28、解:原式=

2分

=----1分

=-----------1分

=-------------1分

29、解:

--2分

--1分

-------1分

------1分

30、解: ∵ a∶b=6∶7,a∶c=15∶4------------------------------2分 a∶b=30∶35,a∶c=30∶8----------------------------2分

∴ a∶b∶c=30∶35∶8---1分

五、应用题(本大题共5小题,每小题6分,满分30分)

31、解:设修完这条公路还需要x天-----------------------------1分

-----------------------------2分

-------------------------1分

X=5--1分

答:修完这条公路还需要5天---------------------1分

32、解:设这批零件共有x个-----1分

------------------------------2分

-----------------------------1分

x=144-----------------------------1分

答:这批零件共有144个。---------------------1分 或另一种解法:

解:------2分

-------------2分

=144(个)-----------1分

答:这批零件共有144个。1分

33、解:∵C=18.84m ∴r= =3m1分

∴R=3+2=5m-------------1分

∴----------2分

50.24×200=10048(元)---1分

答:需用大理石50.24m2,至少该准备10048元。------------------1分

34、解:(1)2000×20%×400------1分

=160000(元)--------1分

答:厂家按第一种方法销售冰箱,400台冰箱全部销售完后可获利160000元。---1分

(2)2000×25%×400-9500-----1分

=200000-9500

=190500(元)-------------1分

∵190500元>160000元

∴选第二种销售方法---------------1分

35、解:(1)12;---------2分

(2)700;-----------------2分(3)5%.-----------------2分

六、解答题(本大题满分5分)

36、(1)解:∵OB=20-------1分

∴-----------1分

-------1分

(2)解:能求阴影乙的面积-----1分

∴--------1分

第四篇:五年级上册寒假英语作业答案

五年级上册寒假英语作业答案

一、请阅读第21页课文,用直线把各人想去的城市连接起来,并把相关句子补充完整。

1.Mr.Webb

Tokyo

2.Mrs.Webb

Paris

3.Janet

Rome

4.Ben

Wellington

二、请根据课文内容,选择适当的词,把下列句子补充完整。

1.Ben would like to go to ______________(Japan / Rome).2.Mrs.Webb thinks Tokyo is a _____________(good / bad)place to visit.3.Paris is ___________________(more beautiful / more interesting)than Tokyo.4.Mrs.Webb thinks Tokyo is _________________(more crowded / more interesting)than Paris.5.Mr.Webb would like to go to a ____________(colder / warmer)place.6.Mr.Web thinks Rome is _____________(colder / warmer)than Paris.7.Mrs.Webb thinks Paris and Rome are so ____________________(quiet and clean / noisy and crowded).8.Wellington is _____________(noisier / quieter)than the other cities.9.Mrs.Webb would like to go to ______________(Tokyo / Wellington).10.Ben thinks Wellington is ____________(interesting / boring).11.Wellington is _____________(busier / cleaner)than Tokyo.12.They decided(决定)to go to ______________(Shanghai / Beijing)at last.四、请根据中文意思,把下列句子补充完整。

1.We're going to g______ o______ h___________ i____ P________(在巴黎度假)this summer.2.I______ l________ t______(我想)go to Japan next year.3.London is ______ g________ p_________(一个好地方)to visit.4.Washington is m____________ b____________ t______ T_________(比东京更漂亮).5.I'm going to _____ w________ p__________(更暖和的地方)with my parents.6.Guangzhou is so n________ a________ c___________(又吵又拥挤).7.Wellington is quieter than t_______ o_________ c__________(其它城市).8.I p_________ t_____(更喜欢)get the red one.9.This classroom i_____ m________ c___________ t______(比...干净的多)that one.10.There are s______ m_________ b___________ p__________(很多美丽的地方)in the UK.11.He has been to m________ c__________ i_____ t______ w____________(世界上很多城市).12.W________ n________(为何不)we go to Lijiang this summer?

第五篇:关于初一历史作业答案

大家把理论知识学习好的同时,也应该要复习,从复习中找到自己的不足,下面是初中频道为大家整理的初一暑假历史作业答案,希望对大家有帮助。

一、选择题

题号***13141

5答案CBDCADBDDADBABA

题号16***2232425

答案BDCCCBCABA

二、非选择题

26.(13分)

(1)A.涿郡B.余杭;(2分)永济渠、通济渠。(2分)

(2)运河形状不同,截弯取直(或隋朝大运河呈大弯曲状,路程远,元朝大运河较直,路途缩短);(2分)

共同影响:都加强了南北经济的交流,促进了社会经济的发展。(2分)

(3)不同;(1分)隋朝大运河的开通一方面加强了南北交通,促进了经济的发展;另一方面由于开凿运河劳民伤财加速了隋王朝的灭亡。(4分)

27.(13分)

(1)手工业发达,越窑青瓷、邢窑白瓷、唐三彩最为有名;商业发达,唐都长安是当时世界上国际性的大都市等等。(2分)

(2)李白、杜甫、白居易等。(3分)

(3)民族关系——文成公主入吐蕃、唐玄宗册封回纥首领为怀仁可汗等等;(2分)对外交往——玄奘西游、鉴真东渡等等。(2分)

(4)《金刚经》是世界上最早的、标有确切日期的雕版印刷品;(2分)吴道子,《送子天王图》。(2分)

28.(14分)

(1)隋朝,科举制;(2分)因为之前的官员大多从权贵的子弟中选拔;许多出身低微但有真才实学的人不能担任高官,不利于社会的发展。(2分)

(2)隋文帝:采取分科考试的方法选拔官员;隋炀帝:设置进士科,科举制度正式诞生;武则天:开始实施殿试,增设武举科;唐玄宗:诗赋成为进士科主要内容。(5分)

还有唐太宗。(1分)

(3)科举制使门第不高的人,可以凭才学做官;选拔官吏的权力,也从地方集中到朝廷;科举制促进了教育事业的发展;科举制也促进了文学艺术的发展。(4分)

29.(10分)

(1)时间早、规模大、次数多、范围广(任意两点即可);(2分)最远到达红海沿岸和非洲东海岸。(2分)

(2)原因:郑和下西洋是和平交往,促进了中国和亚非各国的经济交流,加强了中国和亚非各国的友好关系。(3分)

(3)实行闭关锁国的政策,看不到世界形势的变化,导致中国逐渐落伍;(2分)

我们要吸取教训,坚持对外开放。(言之有理即可)(1分)

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