2011年大连中考数学练习(五)(23题---26题)

第一篇：2011年大连中考数学练习(五)(23题---26题)

2011年大连中考数学复习

（五）（23题---26题）

1.如图，在Rt△ABC中，∠ACB＝90°，AC、BC的长为方程x 2－14x＋a＝0的两根，且AC－BC＝2，D为。AB的中点．

（1）求a的值．

（2）动点P从点A出发，以每秒2个单位的速度，沿A→D→C的路线向点C运动；动点Q从点B出发，以每秒3个单位的速度，沿B→C的路线向点C运动，且点Q每运动1秒，就停止2秒，然后再运动1秒……若点P、Q同时出发，当其中有一点到达终点时整个运动随之结束．设运动时间为t秒．

①在整个运动过程中，设△PCQ的面积为S，试求S与t之间的函数关系式；并指出t的取值范围；

②是否存在这样的t，使得△PCQ为直角三角形？若存在，请求出所有符合条件的t的值；若不存在，请说明理由

2.如图，△ABD中，C是AD上一点，且AD=k DB，DB= k DC，AC=mBC，E是直线BC上一点，∠AEF=∠ACB，EF交直线DB于F，探究AE与EF之间的数量关系。

3.一条笔直的公路上有A、B、C三地，B、C两地相距150千米，甲乙两辆汽车分别从B、C同时出发，沿公路相向而行，分别驶往C、B两地，甲、乙两车到A地的距离y1、y2（千米）与行驶时间x（小时）的关系如图所示，根据图像回答问题：

⑴图中M点的坐标为----------------；⑵补全甲车的函数图像，求甲车到A地的距离y1（千米）与行驶时间x（小时）的函数关系；

⑶若A地设有指挥中心，指挥中心及两车都配有对讲机，对讲机在不超过15千米内能够互相通话，求甲乙两车可以同时与指挥中心用对讲机通话的时间；

24.已知抛物线y=ax + bx +c与x 轴相交于A、B两点，与y轴相交于点C，点A的坐标为（1，0），B的坐标为（3，0），点C的坐标为（0，-3），2⑴求抛物线y= ax + bx + c与直线BC的解析式；

⑵若在抛物线上有一点E，在直线CB上有一点F，以A、C、E、F为顶点的四边形是平行四边形，求F点的坐标 ；

⑶抛物线上是否存在一点P，使得△ACP为直角三角形？若存在，求出点P的坐标，不存在，说明理由；

第二篇：中考数学第二十五题案例分析

中考数学第二十五题案例分析

三道河中学教师张小龙

河北省中考数学试题第二十五题，在整套试题中占有举足轻重的作用，是两道压轴题中的其中之一，因此，做好第二十五题，对于中考考生来说至关重要，跟踪近几年中考，此题多为市场营销的利润题，但2009年发生了变化，变为与生活密切相关的室内装修建材设计，细心想来，其实，出题的路子与以往并无多大变化，只是选材发生了变化。现以2009年中考数学第二十五题为例，对如何解决第二十五题，谈一下自己粗略的认识，与同仁们共同探讨：

25．（本小题满分12分）某公司装修需用A型板材240块、B型板材180块，A型板材规格是60 cm×30 cm，B型板材规格是40 cm×30 cm．现只能购得规格是150 cm×30 cm的标准板材．一张标准板材尽可能多地裁出A型、B型板

y 张、按裁法三裁z张，且所裁出的A、B两种型号的板材刚好够用．

（1）m =，n =；

（2）分别求出y与x和z与x的函数关系式；

（3）若用Q表示所购标准板材的张数，求Q与x的函数关系式，并指出当x取何值时Q最小，此时按三种裁法各裁标准板材

多少张？

分析第一问：答案：（1）m=0n=

3这一问实际上并不难，然而很多考生并未得到分，究其原因，并不是此问有多深奥，而是很多同学根本就没读懂题，认真分析一下裁法一，就可以发现，用标准板材裁出A、B型板材只是将长150cm尽可能多的裁出几个60cm和40cm，要求余料不能再裁，而宽度三种板材一样，所以，不必考虑。裁法一，A板材1块，B板材2块，合计60×1＋40×2=140，余料为10cm.裁法二：A板材2块，用料60×2=120，150-120=30＜40，所以可裁B板材0块即m=0。同理，裁法三，(150-0×60)÷40可得最大整数值为3，即n=3.如下图：

1点拨：中考时，遇到一些读起来有些费解的题目，不要被表面现象所蒙蔽，一定要有耐心，很多题目都能在生活中找到原型，要与实际生活结合起来，把他们看成是生活中的数学，建立出我们所学的数学模型，发现其中隐含的数学知识，多读两遍题，这样比较简单的题目就迎刃而解了。

分析第二问：答案：（2），即这一问，多数同学的疑问就出在：这些板材是否按一种或两种还是三种裁法一共裁出A板材240块，B板材180块，如何确定是按几种裁法裁出的呢？细心人当然一眼就能看出，也就是题中明确指出的：设所购的标准板材全部裁完，其中按裁法一裁x张、按裁法二裁y张、按裁法三裁z张，且所裁出的A、B两种型号的板材刚好够用．所以，是三种裁法，共裁出A板材240块，B板材180块。即

x2y240

y120

x

2x3z18，0即

z60

x

可列式为：1x＋2y＋0z=240,整理得：x＋2y=240, 即

z60

3y120

2x，2x＋0y＋3z=180整理得：2x＋3z=180即

点拨：中考第二十五题在路子不变的情况下，第一问或第二问多数会与一次函数有关，当然一次函数的得出不完全一样，情况（1）：不把得出一次函数作为一个单独步骤，但在解题过程中需要直接或间接求出。例如2006年第二十七题；情况（2）：直接出现两个变量，例如市场营销利润问题中的，销售量随销售价的变化而变化。例如2003、2004年第二十七题；情况（3）：题中出现2或3个未知数，但作为变量不太明显，需要仔细读题找到等量关系后列式再变形成一次函数形式，如2007、2009年中考25题。做这类题首先需要明确属于哪一种情况，对于前两种情况，比较容易掌握。第三种情况，判断清楚了也应该没问题。分析第三问：答案：（3）由题意，得

Q180

16x

x

Qxyzx120

2x60

3x

．

整理，得．

由题意，得

X+2Y=240,2X+3Z=180,y120

x≥0

z60

X≥0

x

≥0

解得 0≤x≤90．

【注：事实上，0≤x≤90 且x是6的整数倍】 由一次函数的性质可知，当x=90时，Q最小． 此时按三种裁法分别裁90张、75张、0张．

分析：本题中说明设所购的标准板材全部裁完，其中按裁法一裁x张、按裁法二裁y张、按裁法三裁z张，且所裁出的A、B两种型号的板材刚好够用．所以很容易得出方程

Qxyzx120

12x60

23x

整理，得

Q180

x

． 然后，根据后两种裁法成立的条件，即y≥0、z≥0得出公共解集0≤x≤90.然后根据一次函数的增减性：Q随x的增大而减小，所以，当x取最大值90时，Q最小=75.此时y=75.z=0.点拨:此题的解法与2004年二十七题、2007年二十五题相似，属于较难的一次函数题。这类题到这一步，必须考虑题中所涉及的量成立，列出不等式组，求出自变量的取值范围，然后根据一次函数的增减性求出最适合的值。但中考第二十五题，有时候，到第三问会以二次函数的形式出现，出现形式是用第二问得出的一次函数代入整道题的函数式中，整理后得出二次函数，然后通过配方或抛物线

b4acb2



22a4ayaxbxc(a0)求出最大值。这时候，特殊问的顶点坐标

题，因题而异，随机解决。

通过这一例题的分析，我们在做这种函数建模的问题应该注意

一、仔细审题，做到分层次去审题。比如先审题干的文字部分，审题干的表格，图形部分，知道题目中告诉了什么。

再审问题，要一个一个问题的审，看看需要求什么，然后分析里面的数量关系，等量关系。这样无论背景怎样创新，我们心中都会底气十足。

二、写出等量关系，把已知量和未知量一起代入等量关系，一般能够看出所建立的模型是一次函数还是二次函数。

三、根据函数解决问题，比如最值问题，需要考虑增减性、取值范围、顶点坐标和实际意义等。还有将函数转化为方程或不等式，即知x求y或知y求x ,等。总之即：分析建模----------解决问题这一模式。

第三篇：重庆数学中考17题练习

2017年重庆中考数学第17题训练五

1.甲、乙两人都从光明学校出发，去距离光明学校1500m远的篮球馆打球，他们沿同一条道路匀速行走，乙比甲晚出发4min．设甲行走的时间为t（单位：min），甲、乙两人相距y（单位：m），表示y与t的函数关系的图象如图所示，根据图中提供的信息，下列说法： ①甲行走的速度为30m/min ②乙在距光明学校500m处追上了甲 ③甲、乙两人的最远距离是480m ④甲从光明学校到篮球馆走了30min.正确的是 ①③（填写正确结论的序号）．

2.（2016春•丰台区期末）甲乙两城市相距600千米，一辆货车和一辆客车均从甲城市出发匀速行驶至乙城市．已知货车出发1小时后客车再出发，先到终点的车辆原地休息．在汽车行驶过程中，设两车之间的距离为s（千米），客车出发的时间为t（小时），它们之间的关系如图所示，则下列结论错误的是 ③

①货车的速度是60千米/小时 ②离开出发地后，两车第一次相遇时，距离出发地150千米 ③货车从出发地到终点共用时7小时 ④客车到达终点时，两车相距180千米

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3.（2016•道里区二模）甲、乙两人匀速行走从同一地点到距离1500米处的图书馆，甲出发5分钟后，乙出发并沿同一路线行走，乙的速度是甲的速度的下列说法：

①甲行走的速度是30米/分，乙的速度是50米/分； ②乙走了7.5分钟就追上了甲； ③当甲、乙两人到达图书馆时分别用了50分钟和35分钟； ④甲行走30.5分钟或38分钟时，甲、乙两人相距360米； 其中正确的个数是 ①②④ 5．设甲、乙两人相距s（米），甲行走的时间为t（分），s关于t的函数图象如图所示，3

4.（2016•枣庄模拟）小明和小亮在操场的同一条笔直的跑道上进行500米匀速跑步训练，他们从同一地点出发，先到达终点的人原地休息，已知小明先出发2秒，在跑步的过程中，小明和小亮的距离y（米）与小亮出发的时间t（秒）之间的函数关系如图所示，下列四种说法：

①小明的速度是4米/秒； ②小亮出发100秒时到达了终点； ③小明出发125秒时到达了终点； ④小亮出发20秒时，小亮在小明前方10米．其中正确的说法为

①②③

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5.（2015•青山区一模）甲、乙两名自行车爱好者准备在一段长为3400m的笔直公路上进行比赛，比赛开始时乙在起点，甲在乙的前面，他们同时出发，匀速前进，已知甲的速度为15m/s，设甲、乙两人之间的距离为y（米），比赛时间为x（秒），图中的折线表示从两人出发至乙先到达终点的过程中y（米）与x（秒）的函数关系，根据图中信息，乙到终点时，甲离终点还有 40 米．

6.甲、乙两名自行车爱好者准备在一段长为3500米的笔直公路上进行比赛，比赛开始时乙在起点，甲在乙的前面．他们同时出发，匀速前进，已知甲的速度为12米/秒，设甲、乙两人之间的距离为s（米），比赛时间为t（秒），图中的折线表示从两人出发至其中一人先到达终点的过程中s（米）与t（秒）的函数关系．乙到达终点C时两人相距 200 米．

7.（2016•莆田模拟）A、B两地之间路程是350km，甲、乙两车从A地以各自的速度匀速行驶到B地，甲车先出发半小时，乙车到达B地后原地休息等待甲车到达．如图是甲、乙两车之间的路程S（km）与乙车出发时间t（h）之间的函数关系的图象． b的值为 ．

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8.（2015•武汉校级模拟）甲、乙两车从A地出发以各自的速度匀速开往450km外的B地，甲车先行0.5h后乙车出发，乙车到达B地后原地休息．甲、乙两车的距离s与乙车行驶的时间t之间的函数关系如图，则此次行程中，甲、乙两车两次相遇的时间间隔为 6 h．

9.（2016•宽城区一模）甲、乙两人从学校出发沿同一路线步行到距学校1500米处的图书馆看书，甲与乙在行进过程中以各自的速度匀速行走，甲比乙先出发5分钟，乙比甲先到达图书馆，甲、乙两人间的距离y（米）与甲的行走时间x（分）之间的函数图象如图所示．线段BC所在直线对应的函数表达式 ．

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第四篇：2014大连中考英语真题

大连市2014年初中毕业升学考试英语 注意事项：

1.请在答题卡上作答，在试卷上作答无效。

2.本试卷共七大题，72小题，满分140分。考试时间100分钟。(受版面限制，完型填空、阅读理解 图略）

第I卷 选择题（共70分）

I.单项填空（本题共10小题，每小题1分，共10分）。

从各题所给的四个选项中，选出可以填入空白处的最佳选项。1.At primary school,I dreamed of being_____astronaut.A.a B.an C.the D./ 2.I often go to the cinema with my parents _____Saturdays.介词 A.at B.by C.on D.in 3.The boys in my class are interested in_____,especially ball games.名词 A.music B.science C.art D.sport 4.--Betty,_____do you start celebrating New Year in America?--On December 31st.副词

A.when B.where C.why D.how 5.The Australians are like the English in many ways_____they have many British relatives.连词(结果状语从句连接词)A.if B.because C.so D.although 6.It's_____to throw away old things.Some of them can be reused.形容词 A.normal B.dangerous C.wasteful D.necessary 7.The air is very clear today,so we'll_____the whole park from up the hill.动词

冠词

A.visit B.enter C.see D.cross 8.My friends are going to different schools,but I hope we will_____with each other.动词短语

A.go back B.grow up C.have a word D.stay in touch 9.The CD player will go wrong if you don't use it _____.副词 A.properly B.carelessly C.quietly D.clearly 10.--I passed my PE test yesterday.情景交际--Did you?_____ A.It doesn't matter B.What a Pity!C.Thanks a lot.D.Congratulations!II.完形填空

（一）（本题共12小题，每小题1分，共12分）

阅读下面短文，理解其大意，然后从各题所给的四个选项中，选出可以填入空白处的最佳选项。In a small village in Parkville,there is an unlocked(未锁的)shop that has no workers in it.The shop is run(经营)in a telephone box.Lewis Cooke,who provides goods(商品)for the shop ,said,“Nothing has been stolen__11__it opened.”

In1998,the only shop in the village__12__.The villagers had great difficulty in getting goods.To solve this problem,the __13__ to change a telephone box into a shop.In the shop ,you __14__find many kinds of goods.Mr.Cooke brings goods to the shop every morning before 7am.He puts__15__the things the shop has in the shop.People can call him if __16__want anything else.The next day,they can go to the phone box to __17__.Mr.Cooke will write down the name of the people who want the goods and put the __18__beside the goods.When the customers come to the shop ,they will be able to find their goods__19__.People can either leave __20__or a cheque(支票)for the goods.“The phone box isn't locked and people can go there whenever they want,__21__no one has stolen a thing.This shows how ___22__everyone around here is,”said Mr.Cooke.11.A when B.until C.before D.since 12.A.opened B.disappeared C.closed D.started

13.A.promised B.decided C.refused D.forgot 14.A.might B.can C.must D.need 15.A.a number of B.a couple of C.a pair of D.a list of 16.A.we B.I C.they D.you 17.A.try it out 试验 B.take it off脱下，起飞

C.write it down写下 D.pick it up拿出 18.A.report B.menu C.paper D.news 19.A.easily B.safely C.regularly D.suddenly 20.A.messages B.advice C.money D.lestters 21.A.so B.and C.or D.but 22.A.honest B.rude C.brave D.polite III.阅读理解

（一）（本题共19小题，每小题2分，共38分）

A.阅读下列短文，根据短文内容，从各题所给的四个选项中，选出最佳选项。Passage 1 Would you like to visit Britain one day?--Our country would like to welcome you!Overseas travel can be expensive.But there are ways of visiting Britain cheaply.We hope that we can give you some good ideas.When to come?If you can avoid the busy months--July and August ,your visit may be cheaper.There will be smaller numbers of visitors.British weather is pleasant from April to the end of September.Of course,you can visit it in winter,but it is often dark by 4pm.Many places,such as large houses and castles(城堡),are closed early in winter.However,if you are interested in museums,art galleries or theatres,winter may be a good time to visit.Be prepared.If you are a student,it's a good idea to apply for(申请)an International Student Identity Card(身份证).With this card,you can save a lot of money.You can get the card from your local student travel office ,and you can also call(44)-08708-413224 to get it.To get the card,you need to show that you are a student,get a passport photo ,and pay a little money.23.Which is the most popular time for visitors to Britain?细节题 A.July and August B.The winter season C.From April to September D.The vacation season.24.What's the weather like in winter in Britain?细节题 同意转换 A.There is lots of snow.B.The daytime is short.C.It's neither hot nor cold.D.The weather is pleasant.25.If you are a student with an International Student Identity Card,_____.细节题 A.you have to prove you're a student B.you will pay less money for your trip.C.you can call(44)-08708-413224 for help.D.you must apply for a trip from the student travel office 26.The writer of this article is _____.细节题 A.a German B.a Chinese C.an Englishman D.an American 27.This passage is mainly about_____.2009fashion 特例 每一段讲什么 纠结两项用核心概念

A.when to visit Britain B.why to take a trip to Britain C.what to do and see in Britain D.how to trip cheaply in Britain Passage2 Mr.Dawson was an old man with a bad temper.Kids(孩子)were afraid to go into his yard(院子)to pick apples.One day ,12-year-old Janet and her friend Amy had to walk past Mr.Dawson's house.When Janet saw him ,she suggested crossing the street to the other side.But Amy said they needn't.When Mr.Dawson saw Amy ,he smiled and said ,“Hello,Amy!I see you have a new friend with you today.”Amy smiled back.Mr.Dawson looked friendly and gave them each a fresh apple.Later Janet asked Amy,“Everyone says he is the most unwelcome person in town.Why was he so kind to us?”Amy explained that when she first walked past his house,she was also afraid of him.But she imagined there was an invisible(看不见)smile on his face and then started talking to him.Beginning with a “hello”at first,and then speaking more each time.“An invisible smile?”Janet was puzzled(困惑的).“Yes,”answered Amy.“My grandma told me to think so.She says smiles can spread.If we keep smiling at someone ,sooner or later they will smile back.”

Remember what Amy's grandma said,and we will find that most people can't refuse our smile.28.Mr.Dawson was thought to be a(an)_____person.细节 A.warm-hearted B.unhappy C.badly-behaved D.unfriendly 29.How did Janet feel when Mr.Dawson gave them two apples? 细节 A.Happy B.Surprised.C.Proud.D.Terrible.30.Why was Mr.Dawson kind to Amy?细节

A.Because Amy was never afraid of him.B.Because Amy's grandma was his old friend.C.Because Amy was kind to Mr.Dawson first.D.Because Amy was the most popular girl in town.31.From the story,we know Amy is a girl who_____.推断题 A.likes helping others B.never says no to older people C.enjoys working with her friends D.would like to take others' advice 32.Which can be the best title of this passage? 主旨 A.How to be a welcome person B.Smiles build a better world C.what's the best thing about life?.Is it important to get on well with others? Passage3 What will the house of the future look like?Could it have gardens on its walls,or a pool with fish for dinner ? Architects(建筑师)believe that they are all possibilities.The only thing for sure is that the house will be as green as possible.The tree house Many architects in the world would like to build a “tree house”.Like a leaf ,the surface of the house collects sunlight during the day.The energy can be used to heat water,produce electricity,and even create fresh air for the home.The “root(根)”of the house is deepunder the ground so that it can control（控制）the home's temperature.The lizard（蜥蜴）house

Like a lizard ,changing colour with the weather is the most important design of a lizard house,When it's in the bright sun,the cover of the house will turn dark to protect it from strong heat.During dark days,it rurns white and takes in as much light and heat as possible to produce energy.Meals at home The future of food production is taken as one part of the design of the building.Gardens may appear on the outside walls of the house.People can plant tomatoes,carrots and green tea on them.So every day in the morning,you just need to walk outside and collect your meals.Learning from the past Looking to the future isn't the only way to be green.Sometimes,ancient techniques(技术)can also help cut down energy use.For example,a chimney(烟囱)can be a useful air conditioner because it is easier for hot air to flow out of the chimney.33.The tree house is special for _____.细节 同义转换

A.fresh air creation B.energy collection C.its recycling system D.electricity production 34.What is the colour of the lizard house in sunny days? A.White.B.Black.C.Bright D.Dark.turn用法 35.“Meals at home”means_____.段落主旨 A.we needn't buy food any more B.the house can produce food itself C.meals will be cooked more easily at home D.plants will be grown on the walls of the house 36.The last kind of the house is different from others because_____.细节 A.it looks as the same as an old house B.it makes less use of natural materials C.it gets the idea from ancient techniques

D.it is easier for hot air to flow out of the house 37.All the houses above are designed to _____.A.reduce air pollution B.cut down energy use C.make our life greener A推出B 选A D.create a news environment B.阅读短文，根据短文内容，从所给的六个选项中选出可以填入空白处的最佳选项，使短文意思完整、连贯。（有两项为多余选项）

Passage4 关键信息

Freedom of riding bicycles There isn't any other type of transportation that is as common as bicycles.In China,they have a very long history.But now ,not only in China,bikes are becoming popular in many European countries.__38(_F_)Bicycles are popular for many reasons.The most important one is prodably its great use in protecting the environment.__(D)39__In some European countries,bike-griendly facilities(设施)have helped clear busy roads.As a traditional “cycling capital”,Copenhagen's roads keep bicycles and cars separated（分开）as much as possible.On these routes(路线),there are pre-green lights for cyclists.These kinds of bicycle traffic lights turn green a few seconds before car traffic lights do.It gives the cyclists time to avoid traffic while crossing.Cycling also gives people a feeling of freedom.__40_(C)_In cities like Amsterdam and Hague ,up to 70 percent journeys are made by bike.To make biking easier,many European cities like Paris and Berlin allow cyclists to bring their bicycles onto subway trains.主旨题

__41__(A)There are some safety rules you need to follow.Stop at all stop signs and obey red lights just as cars do.Wearing a helmet(头盔)can protect your head if you fall down.If you are cycling with friends,ride in a line.Don't face each other while riding side by side.A.However,cycling is not always easy.B.They're especially popular among students.C.Some young people see cycling as a fashion.D.Cycling is also a great way to reduce heavy traffic.E.That's why many young people choose it as a way to get around the city.F.According to the BBC,more bicycles were sold than cars in Europe last year

IV.情景交际（本题共5小题，每小题2分，共10分）

根据对话内容，从所给的七个选项中选出可以填入空白处的最佳选项，使对话内容完整。为多余选项）

Betty:What are you going to do on holiady,Tony? Tony:__42__(D)Betty:You'll love it!I Went there two years ago.We had a great time.Tony:__43__(G)Betty:It took about nine hours.Tony:__44__(C)Betty:Well, first, we went to Disneyland.Then we went to Hollywood.Tony:__45__(B)I can't wait to go there.Betty:It's really a wonderful place.__46__(E)Tony:Thank you.（有两项

A.I've no idea.B.It sounds brilliant!C.Where did you go? D.We are going to Los Angeles.E.I'm sure you will have a nice trip.F.Did you see anything interesting? G.How long did it take to get there? 第II卷 非选择题（共70分）

V.完形填空

（二）（本题共15小题，每小题2分，共30分）

A.根据短文内容，用方框内所给词或短语的适当形式填空，使短文内容完整。（每词或短语限用一次）

many classroom good a few get family ill stop hear of have

Hope for the future 初三课文原文

Liu Sanzi is an eight-year-old boy from a village in Hunan Province.His parents want him to drop out of school.It's important for him to work on their farm because there are seven people in Liu's __47family__ and they are very poor.Li Yinming is 14 and from hangxian in Gansu Province.He __48stopped__ going to school a few years ago.His parents have been __49ill and he has to look after them.Many children like Li Yinming and Liu Sanzi can't __50get__ an education because their families are poor.Now they can go to school with the help of Project Hope.In the last 15 years, this project __51has__ raised money and paid for the education of 2.5 million poor students in the countryside.People in China and abroad have given 2.2 billion yuan.With this money, Project Hope has built __52_many_ schools and libraries.It has also trained teachers and it has sent students to high schools.Last year Shen, a boy from Shanxi Province, went to a school with no electricity and only __53a few__ books.But this year he's at a new school with big __54classrooms__ and lots of books.Project Hope paid for it.Most people in China have __55heard of__ Project Hope and have given money.But 40 million children from poor families still need help.Because of Project Hope, thousands of children have __56better__ lives.Perhaps we should all ask: What can we do for Project Hope? How can we help? B.阅读下面短文，在短文的空格内填入适当的词，使其内容通顺。（每空格限填一词）

Did you know that Earth is home to __57millions__ of animals? A recent survey shows that scientists have found more than 2 million kinds of animals and there are over 10 million we haven't discovered yet.Animals are much more than food or pets for humans.Animals are __58_clever_.Some of them do very unusual things.Research shows that animals can use tools.For example, chimpanzees（黑猩猩）use sticks to get white ants out of the ground.They even teach each other how to use tools.Scientists find that animals have their __59own_ ways to communicate.Did you know dolphins（海豚）use ultrasound（超声）to communicate? Birds learn to sing from their parents.They also learn to tell the difference between the sound of their group and those of other groups.Animals have societies too.Let's take ants as an __60example__.An ant family usually has millions of ants.Some ants are strong enough to fight against enemies（敌人）.Some take care of babies.Others go looking for food.They have organizations that make the group work well.Animals can help humans in many ways.Long age, people used pigeons(鸽子）to send mail over long distances.Dogs have been the best friends to humans since ancient times.Nowadays some dogs are even __61__helpful to guide blind people.Dogs also use their noses to search out drugs for the police.Ⅵ.阅读理解

（二）（本题共5小题，每小题2分，共10分）

阅读下面短文，根据短文内容，回答下列问题。

Jessica Ennis:a role model for teenagers Jessica Ennis,a British track and field（田径运动）star,was chosen as the World Sportswoman of the Year 2013.The 27-year-old athlete（田径运动员）was the face of the London 2012 Olympics and is a role model to many teenagers.Ennis developed her interest in track and field at a young age.When her parents took her to hurdle events at a stadium in England,she fell in love with the sport immediately.In addition to the hurdles,Ennis tried her hand at the heptathlon（女子七项全能）,a race combination（结合）of high jump,long jump,100-metre hurdles and four other sports events.Throughout high school,she spent much of her time on training.However,many of her schoolmates didn't believe she could be an athlete.“When I started practicing the heptathlon,I was always getting people saying‘You’re too small and you won't be good at this event because of your height,'”Ennis said.But other people's words didn't make her feel sad.Instead,she started practicing even harder than before.She dreamed of being an Olympic champion one day,and her dream came true finally.Ennis's success inspires（鼓舞）many teenagers:if you want to achieve anything,you just give this all your attention and don't worry about other people's words.If you have a dream,please follow your heart and try your best to make it happen!62.How old was Ennis when she became an Olympic champion?26years 63.What did Ennis's schoolmates think of her as an athlete? too small and you won't be good at this event because of your height 64.Did Ennis believe she could be a successful athlete? Yes, she did 65.Why did Ennis become successful? you have a dream,please follow your heart and try your best to make it happen!

66.Why did the writer call Ennis a role model for teenagers?

Ⅶ.写

A.句子翻译。将下列句子译成英语。（本题共5小题，每小题2分，共10分）67.艾尔斯岩（Ayers Rock）长3,600米，高348米。

固定用法 Ayers Rock is 3.6 kilometers long, and 348 meters high.68.摄影比赛你获奖了吗？

一般过去时 Did you win the photo competition? 69.妈妈让我每天自己整理房间。每天| 一般现在时 Mum asks me to tidy up the room myself every day.70.孔子是中国古代伟大的思想家，今天我们依然受他思想的影响。被动语态 Confucius is known as a great thinker in ancient China, we are influenced by his thoughts today.71.对外国人来说，如果他们以前没用过筷子，用起来就会很难。If 条件状语从句 | it is adj.to do It is difficult for foreigner to use chopsticks if they haven’t used them before.B.书面表达（共20分）

72.假期中，我们有时间做与学校学习生活不同的很多事情，如旅游、干家务、做义工、参加夏（冬）令营„„请你根据以往的假期生活经历，用英语写一篇短文，跟同学们分享你在假期做过的一件事情及体会。

内容提示：（1）讲述你在假期里做过的一件事情；

（2）谈谈你做这件事情的体会。

要求：（1）中心突出，语义连贯，层次清晰，书写规范；

（2）文中不得出现真实姓名和校名；

（3）词数80词左右。

完型：连词

2、动词

3、名词

2、短语

2、代词

1、形容词

1、副词

1、阅读：旅游、道理、科技、环保、健康、励志 翻译：1几米高 时态 一般过 一般现

3被动 固定句式 it is adj，5从句

第五篇：2014中考数学练习(一)

2014年中考数学每日一练

练习题

（一）1、将下列图形绕其对角线的交点逆时针旋转90，所得图形一定与原图形重合的是()

A．平行四边形B．矩形C．菱形D．正方形

2、现有3cm，4cm，7cm，9cm长的四根木棒，任取其中三根组成一个三角形，那么可以组成的三角形的个数是（）

A．1个B．2个C．3个D．4个

3、为落实“两免一补”政策，某市2011年投入教育经费2500万元，预计2013年要投入教育经费3600万元．已知2011年至2013年的教育经费投入以相同的百分率逐年增长，则2012年该市要投入的教育经费为万元．

4、某宾馆有单人间和双人间两种房间，入住3个单人间和6个双人间共需1020元，入住1个单人间和5个双人间共需700元，则入住单人间和双人间各5个共需_____________ 元．

m-1x5、若关于x有增根，则m的值是（）x-1x-1

A．3B．2C．1D．-

16、在一次“人与自然”知识竞赛中，竞赛题共25道，每题4个答案，其中只有一个正确，选对得4分，不选或选错倒扣2分，得分不低于60分得奖，那么得奖至少应答对题（）

A．18题B．19题C．20题D．21题

x-1≤0，7、不等式组的整数解是．．．-2x＜30

阅读材料：若一元二次方程ax+bx+c=0(a≠0)的两个实数根为x1、x2，则两根与方程系 数

8、bc之间有如下关系：x1+x2=-，x1x2． aa

11根据上述材料填空：已知x1、x2是方程x2+4x+2=0的两个实数根，则+． x1x2229、已知关于x的方程xmx50的一个根是5，那么m10、一学校为了绿化校园环境，向某园林公司购买了一批树苗，园林公司规定：如果购买树苗不超过60棵，每棵售价120元；如果购买树苗超过60棵，每增加1棵，所出售的这批树苗每棵售价均降低0.5元，但每棵树苗最低售价不得少于100元，该校最终向园林公司支付树苗款8800元，请问该校共购买了多少棵树苗？