八年级数学下册期中测试题及答案

一.精心选一选，旗开得胜（每小题3分，共30分）

1. 把直角三角形的两直角边均扩大到原来的两倍，则斜边扩大到原来 的( )

A.8倍 B.4倍错误！未找到引用源。 C. 2倍 D. 6倍

2.两个直角三角形全等的条件是（ ）

A. 一锐角对应相等 B.两锐角对应相等 C.一条边对应相等 D.两条边对应相等

3.下面的性质中，平行四边形不一定具有的是（ ）

A.内角和为360° B.邻角 互补 C.对角相等 D. 对角互补

4.如图，如果平行四边形ABCD的对角线AC、BD相交于点O，那么图中的全等三角形共有（ ）

A.1对 B.2对 C.3对 D.4对

第4题图

5.□ABCD的对角线交于点O，且AB=5，△OCD的周长为23，则□ABCD的两条对角线的和是

（ ）

A.18 B.28 C.36 D.46

6. 若点M（x，y）满足x+y=0，则点M位于 （ ）

A. 第一、三象限两坐标轴夹角的平分线上；　 B. x轴上；

C. 第二、四象限两坐标轴夹角的平分线上； D. y轴上。

7.已知x、y为正数，且｜ |+(y2-3)2=0，如果以x，y的长为直角边作一直角三角形，

那么以此直角三角形的斜边为边长的正方形的面积为（ ）

A.5 B.25 C.7 D.15

8.在平面中，下列说法正确的是（ ）

A.四个角相等的四边形是矩形 B.对角线垂直的四边形是菱形

C.对角线相等的四边形是矩形 D. 四边相等的四边形是正方形

9.下列图形中，既是轴对称图形又是中心对称图形的有（ ）

A.4个 B.3个 C.2个 D.1个

第9题图 第10题图

10. 如图所示，矩形ABCD的对角线AC，BD相交于 点O，CE∥BD，DE∥AC.若 BD＝ 6，则四边形CODE的周长是 (　　)

A．10 B．12 C．18 D．24

二.细心填一填，一锤定音（每小题3分，共30分）

11. 在Rt ABC中，∠C=90°，∠A=65°，则∠B= .

12一个等腰直角三角形中，它的斜边与斜边上的高的和是18cm，那么斜边上的高为

cm ．

13.如图，已知□A BCD中，AB=4,BC=6,BC边上的高AE=2，则DC边上的高AF的长是 .

第13题图 第15题图 第17题图

14.□ABCD的周长为60cm,其对角线交于O点，若△AOB的周长比△BOC的周长多10cm, 则

AB= cm.

15.如图，已知在□ABCD中，AB=4cm,AD=7cm，∠ABC的平分线交AD于点E，交CD的延长线

于点F，则DF= cm.

16. 一个多边形的每一个外角等于30°，则 此多边形是　　边形，它的内角和等于　　 　。

17.如图，正方形ODBC中，OC=1，OA=OB，则数轴上点A表示的数是 .

18.点P（a,a-3）在第四象限，则a的取值范围是 .

19.如图，正方形ABCD的顶点B、C都在直角坐标系的x轴上，若点A的坐标是（-1，4），

则点C的坐标是 .

20. 如图所示，矩形纸片ABCD中，AB＝5 cm，点E在BC上，且AE＝EC.若将纸片沿AE折叠，点B恰好与AC上的点B′重合，则AC＝________ cm.

第19题图 第20题图

三.用心做一做，慧眼识金（每小题8分，共24分）

21.如图，△ABC中，∠BAC＝900，AD是△ABC的高，∠C=300,BC=4,求BD的长.

22.如图，如果□ABCD的一内角∠BAD的平分线交BC于点E,且AE=BE，

求□ABCD各内角的度数.

23.如图，将长为2.5米长的梯子AB斜靠在墙上，BE长0.7米。

（1）求梯子上端到墙的底端E的距离（即AE的长）；

（2）如果梯子的顶端A沿墙下滑0.4米（即AC=0.4米），则梯脚B将外移（即BD长）多

少米？

四.综合用一用，马到成功（共8分）

24.如图，某住宅小区在施工过程中留下了一块空地（图中的四边形ABCD）,经测量，在四

边形ABCD中，AB=3 m，BC=4m,CD=12m,DA=13m，∠B=900,

(1)△ACD是直角三角形吗？为什么？

(2)小区为美化环境，欲在空地上铺草坪，已知草坪每平方米100元，试问铺满这块空地共

需花费多少元？

五.耐心想一想，再接再厉（共8分）

25.已知，如图在平面直角坐标系中，S△ABC=30，∠ABC =450，BC=12，求△ABC三个顶点的坐标.

六.探究试一试，超越自我（每小题10分，共20分）

26.如图（1），在△OAB中，∠OAB=900,∠AOB=300,OB=8,以OB为边，在△OAB外作等边三角

形OBC，D是OB的中点，连接AD并延长交OC于E.

（1）求证：四边形ABCE是平行四边形；

（2）如图（2），将图（1）中的四边形ABCO折叠，使点C与点A重合，折痕为FG,求OG的

长。

27.已知：如图，在□ABCD中，E、F分别为边AB、CD的中点， BD是对角线，AG∥DB交CB的延长线于G．

（1）求证：△ADE≌△CBF；

（2）若四边形BEDF是菱形，则四边形AGBD是什么特殊四边形？并证明你的结论．

一.1—5 ：CDDDC 6—10：CCACB

二.11.250 12.6 13.3 14.20 15.3 16. 12 1800° 17.- 18.0

四.24.（1）三角形ACD是直角三角形，理由（略）

（2）3600元

五.25.证明：∵S△ABC= 1/2BC•OA=30，∠ABC =450，BC=12，

∴OA=OB=60÷12=5， ∴OC=7， ∵点O为原点，

∴A（0，5），B（-5，0），C（7，0）．

六.26.（1）证明（略）

（2）设OG=x，由折叠的性质可知：AG=GC=8-x，

在直角三角形AOB中，∠OAB=900，∠AO B=300，OB=8.

所以AB= OB=4，由勾股定理得OA=4√3，

在直角△OAG中，OG2+OA2=AG2

即 ，解得x=1，即OG=1

27. （1）证明：∵四边形ABCD是平行四边形，

∴∠4=∠C，AD=CB，AB=CD． ∵点E、F分别是AB、CD的中点，

∴AE= AB，CF= CD． ∴AE=CF． ∴△ADE≌△CBF（SAS）．

（2）解：当四边形BEDF是菱形时，四边形AGBD是矩形． 证明：

∵四边形ABCD是平行四边形， ∴AD∥BC． ∵AG∥BD，∴四边形AGBD是平行四边形．

∵四边形BEDF是菱 形， ∴DE=BE． ∴AE=BE， ∴AE=BE=DE．∴∠1=∠2，∠3=∠4．

∵∠1+∠2+∠3+∠4=180°，∴2∠2+2∠3=180°．∴∠2+∠3=90°．即∠ADB=90°．

∴四边形AGBD是矩形．

初二数学下册单元试题及答案解析

一.细心选一选：(本大题12个小题，每小题4分，共48分)在每个小题的下面，都给出了代号为A、B、C、D的四个答案，其中只有一个是正确的，请将正确答案的代号填在表格中.

1.在分式中，x的取值范围是(　　)

A. x≠1 B. x≠0 C. x>1 D. x<1

2.在以下回收、绿色食品、节能、节水四个标志中，是轴对称图形的是(　　)

A. B. C. D.

3.已知α、β是一元二次方程x2﹣2x﹣3=0的两个根，则α+β的值是(　　)

八年级数学什么单元卷子好

北大绿卡，课课大考卷，启动中学作业本，都是不错的题 四星级题库

八年级英语试卷及答案人教版

八年级 英语期末考试与学生的学习是息息相关的。下面是我为大家精心整理的人教版八年级英语期末试题，仅供参考。

人教版八年级英语期末试题

Ⅰ、听力部分(20分，每小题1分)

一、听下面5段对话。每段对话后有一个小题，从题中所给的A 、B、C三个选项中选出最佳答案，并将其标号填入题前括号内。每段对话读两遍。

( ) 1. What time will they meet?

A. At 7:00. B. At 7:15. C. At 6:45.

( ) 2. How many ladies are from Australia?

A. One. B. Two. C. Three.

( ) 3. Where does the conversation take place(发生)?

A. In a restaurant. B. In a post office. C. In a hotel.

( ) 4. What number did the man call?

A. 809713. B. 809731. C. 807931.

( ) 5. What are the two speakers going to do?

A. See a film. B. Eat out. C. Play computer games.

二、听下面几段对话或独白。每段对话或独白后有几个小题，从所给的A 、B、C三个选项中选出最佳答案，并将其标号填入题前的括号内。每段对话或独白读两遍。听下面一段对话，回答第6至第8三个小题。

( ) 6. Which city would Zhang Jing like to go to for the coming holiday?

A. Beijing. B. Nanjing. C. Tianjing.

( ) 7. Who is Zhang Jing going to see?

A. Her grandparents. B. Her uncle. C. Her parents.

( ) 8. What will Mike bring to Zhang Jing tomorrow?

A. Photos. B. Tickets. C. Maps.

听下面一段对话，回答第9至第10两个小题。

( ) 9. What does the man ask the woman to do every morning?

A. To go swimming. B. To go riding. C. To go running.

( ) 10. How long should the woman do exercise in the morning?

A. For about twelve minutes. B. For about forty minutes.

C. For about twenty minutes.

听下面一段独白，回答第11至第13三个小题。

( ) 11. What was the woman doing?

A. Seeing a film. B. Looking for the food. C. Sleeping.

( ) 12. Where did the man sit?

A. Behind the woman. B. In front of the woman. C. Next the woman.

( ) 13. Where were the man’s teeth?

A. In the woman’s cake. B. In the woman’s handbag. C. In the cake on the floor.

听下面一段对话，回答第14至第15两个小题。

( ) 14. What are they talking about?

A. How to save paper. B. How to protect the environment.

C. How to save waste plastic(塑料) bags.

( ) 15. What shouldn’t we do if we want to have a clean world?

A. Throw the plastic bags away after we use them once.

B. Use both sides of paper. C. Collect waste paper and soft drink cans.

三、听下面一篇短文。根据所听内容选择正确答案，并将其标号填入题前括号内。短文读两遍。

( ) 16. What do most American families do with newspapers each day?

A. They sell newspapers. B. They buy at least ten different newspapers.

C. They read newspapers.

( ) 17. What do newspapers provide us with?

A. Everything in our own city. B. Only world news.

C. Home news and world news.

( ) 18. When can we read important events that happen in other countries?

A. As soon as they happen. B. On the same day when they happen.

C. A week or a month after they happen.

( ) 19. How long did news often take to travel from one country to another hundreds of years ago?

A. Hours or days. B. Days or weeks. C. Months or years.

( ) 20. What about the news in the past?

A. It wasn’t always true. B. It was never true. C. It was always true.

Ⅱ、笔试部分(80分)

四、单项选择(共15分，每小题1分)

( ) 21. These books were really good, so she couldn’t .

A. put down it B. put it down C. put down them D. put them down

( ) 22. —Do you think if Tom the work well?

—I think he will if he his best.

A. does, will try B. will do, tries C. does, tries D. will do, will try

( ) 23. —I have never been to African countries. What about you?

— ________.

A. Neither have I B. So do I C. Neither do I D. So have I

( ) 24. Don’t worry! I’ll do what I can you when you are in trouble.

A. to help B. help C. helping D. helped

( ) 25. —I'm going to visit Yellow Mountain with my family this weekend.

— ________.

A. Good luck B. Congratulations C. Have a great time D. That sounds good

( ) 26. — ________ have you learned to play the piano?

— ________ five years ago.

A. How long, For B. How often, For

C. How long, Since D. How soon, Since

( ) 27. —Are you worried about the coming exam?

—No, I think the more ________ you study, ________ mistakes you’ll make.

A. careful, the less B. careful, the fewer

C. carefully, the less D. carefully, the fewer

( ) 28. —Do you know __ ___?

— Sorry, I don’t. But I saw her just now. xKb 1.C om

A. where has she gone B. where she has gone

C. where she has been D. where will she go

( ) 29. I have __ ___ decided when to leave, but my sister hasn’t decided

__ ___.

A. yet, yet B. already, already C. already, yet D. yet, already

( ) 30. —I called you last night, but no one answered me.

—Oh, I________ a shower.

A. have taken B. was taking C. took D. will take

( ) 31. The policeman asked the child ________ cross the street ________ the traffic lights turned green.

A. not, when B. not to, unti C. didn't, before D. not to, after

( ) 32. —I ________ a new house recently.

—Great. When ________ you ________ it?

A. have bought, did, buy B. have bought, have, bought

C. bought, did, buy D. bought, have, bought

( ) 33. Two thirds of the population of the village ________ farmers. The number of them ________ about 2,000.

A. is, is B. is, are C. are, are D. are, is

( ) 34. —I’m leaving for the exam. Bye, Mum.

—Well, make sure you’ve got ________ ready.

A. something B. anything C. everything D. nothing

( ) 35. — ________ is your school?

—I can’t remember it well. I________ for ten years.

A. How big, have left B. What big, have been away

C. How big, have been away D. What big, have left

五、完形填空(共15分，每小题1.5分)

Do you write your own blog(博客)? Do you often 36 other’s blogs on the Internet?

All over the world, not only famous persons but also many students use blogs as diaries and places to share their experiences and 37 advice or help.

“ I write my activities every day, 38 funny things and worries in my life.” says Lili, a high school student in Washington. “ I like putting pictures on my blog because it can make my blog more 39 and more people will like it. It’s a good way 40 my life to the world.” She has had her blog for eight months.

Students like writing blogs 41 they can write anything they want to, but don’t need to 42 any money.

When you start to write your blog, you will find 43 necessary to open up your eyes to a new world. But what you write down may trouble you 44 . So use the blog carefully 45 you can keep yourself away from some trouble. The blog makes everyone’s life colorful.

( ) 36. A. read B. write C. forget D. miss

( ) 37. A. learn from B. hear of C. ask for D. depend on

( ) 38. A. without B. including C. between D.include ( ) 39. A. common B. modern C. famous D.interesting ( ) 40. A. to show B. showing C. show D.showed ( ) 41. A. unless B. while C. until D. because

( ) 42. A. save B. spend C. take D. waste

( ) 43. A. that B. it C. one D. those

( ) 44. A. sometimes B. always C. ever D.never

( ) 45. A. only when B. even though C. so that D. ever since

六、阅读理解(共30分，每小题2分)

Dear Sir,

I am writing to you about my stay at your hotel. My wife and I arrived on Saturday, May 15th and stayed for a week. Though we were treated well and found the service excellent, we think there are one or two things we should bring your attention.

1. We hoped for a nice holiday from our busy work lives, and your ad said “comfortable and quiet”. We want to have a chance to enjoy ourselves. However, we were always waken up by the noise every morning. Is it really necessary for the workers to start their repair work so early?

2. We hoped to swim in your “wonderful pool”. To our disappointment(失望), we found that it was closed for the whole time of our stay.

I hope you do not mind my writing to you about these things, but I would be happy if you could give me some explanation(说明). As I said at the start, it is a pity, and your service is so good in other places.

I hope to hear from you soon.

Yours sincerely

Tom Green

( ) 46. Who is Mr Tom Green probably writing this letter to?

A. His friend. B. The owner of a hotel. C. A reader. D. His father.

( ) 47. When did they get to the hotel?

A. On May 15th. B. A week ago. C. Last year. D. On a cold morning.

( ) 48. What’s the main idea of the second paragraph (段落)?

A. The hotel was very comfortable and quiet.

B. The workers in the hotel were very hard-working.

C. He thought the hotel didn’t provide them with a quiet place.

D. The service in the hotel was very excellent.

( ) 49. What did Mr Green think about the swimming pool?

A. He felt disappointed because the swimming pool was closed for the whole time of their stay.

B. He felt disappointed because the swimming poop was too small.

C. He felt excited about it because he had a good time there.

D. He found it really wonderful, just like the words in the ad.

( ) 50. What kind of letter is it?

A. An invitation letter. B. A thank-you letter.

C. A sorry letter. D. A complaint letter.

Mobile phones(手机) have become a problem for middle schools. Some middle schools in Australia have stopped students from carrying mobile phones during school hours. The mobile phone use among children has become a problem for the school this year. Several children have got mobile phones as Christmas gifts, and more students will want them.

Mary, a teacher, said the mobile phone use is a distraction to students during school hours and it also gives teachers so much trouble in their classrooms. Teachers also said that sometimes students might use phone messages to copy during exams. She said some schools tried to stop mobile phones. Some parents felt unhappy because they couldn’t get in touch with their children.

Many teachers said students should not have mobile phones at school, but if there was a good reason, they could leave their phones at the school office. They also said there were many reasons why the students should not have mobile phones at school, they were easy to lose and were a distraction for studies.

Many people say that they understand why parents would want their children to have phones, but they think schools should let the students know when they can use their mobile phones.

( ) 51. Some middle schools in Australia have stopped students from carrying mobile phones .

A. because they are students B. when they are free

C. when they are at school D. because they are children

( ) 52. We know from the passage that some children get mobile phones from .

A. the makers and sellers B. the teachers

C. their parents and friends D.some mobile phone users

( ) 53. What does the underlined word mean in the passage?

A. 鼓舞 B. 分心 C. 奖励 D. 核对

( ) 54. Some parents felt unhappy because they couldn’t _ __ during school hours.

A. use their mobile phones B. leave their mobile phones at the school office

C. help the teachers with their work D. get in touch with their children

( ) 55. The passage mainly tells us that _ __.

A. students shouldn’t have mobile phones at school except(除…外) some special reasons

B. it is impossible to stop students from using mobile phones at school

C. some parents felt unhappy because they couldn’t use their phones at school

D. parents should teach children how to use mobile phones during school hours

Hundreds of years ago, life was much harder than it is today. People didn’t have modern machines. Life today has brought new problems. One of the biggest is pollution. Water pollution has made our rivers and lakes dirty. It kills our fish and pollutes our drinking water. Noise pollution makes us talk louder and become angry more easily. Air pollution is the most serious kind of pollution. It’s bad to all living things in the world.

Polluted air from cars, planes and factories is so thick that it is like a quilt(被子) over a city. This kind of quilt is called smog(烟雾). Many countries are making rules to fight pollution. Factories must now clean their water before it is thrown away. And they mustn’t blow dirty smoke into the air. We need to do many other things. We can put waste things in the dustbin and not throw it on the ground. We can go to work by bus or with our friends in the same car. If there are fewer people driving, there will be less pollution.

Rules are not enough, every person must help to fight pollution.

( ) 56. Hundreds of years ago, life was much harder than it is today because ___ __.

A. there were fewer modern machines at that time than today

B. people didn’t like to use modern medicines

C. there were no modern machines at all

D. there was no pollution at all

( ) 57. What is the biggest problem in today’s life?

A. Dirty water. B. Pollution. C. Noise. D. Too crowded

( ) 58. The most serious kind of pollution is ___ ___.

A. noise pollution B. air pollution C. water pollution D. waste paper

( ) 59. Factories must clean their water ___ ___.

A. before they use it B. when they use it

C. before it is thrown away D. whenever they use it

( ) 60. From the passage we know that _ ___.

A. a few years ago, there was no smog at all

B. today people don’t have to talk to each other in a loud voice

C. people are making rules in order to fight pollution

D. people can only use rules to fight pollution

七、单词拼写(共5分，每小题1分)

61. People lived in bad c ____ __ (条件) in the past.

62. Our English teacher often e____ __ (鼓励) us to study English hard.

63. With the d__ ____ (发展) of the modern city, we need more living abilities.

64. We should be honest students instead of c__ ____ (欺骗) our teachers.

65. The countryside is a p__ __ __(完美的) place to take a holiday.

八、补全对话(共5分，每小题1分)

请从A-G中选出五个 句子 完成对话，其中有两项多余。

A: Hello, Helen. The happy summer vacation is coming. 66

B: Yes. I’m not busy at all. I’ve just finished my homework.

A、What’s your name?

B、What color do you want

C、Here you are

D、Can I help you

E、What size do you like

F、How about this T-shirt

G、I’ll take it

A: 67

B: I have no ideas. What about you?

A: Let me see. We’d better do something interesting and helpful. 68

B: Certainly. Where?

A: In the new museum.

B: Oh, I remember. I heard of it last week. 69 IIwesfsufslfjklvmdklvdklv

A: By bike. It’s Saturday tomorrow. The traffic must be heavy, I think.学I]

B: I agree. 70

A: At the gate of our school at nine in the morning.

B: OK. See you then.

九、书面表达(10分)

假如你是Sally，是个中学生，经常收听音乐节目(program)，请你用英语给节目主持人写一封信，信的要点如下：

1、你听这个节目已经3年了，很喜欢这个节目， 特别(especially)是英文歌曲节目，到目前为止已学了10首英文歌曲;

2、当你学习繁忙或疲劳时，你常会打开收音机(recorder)去收听这个节目;

3、自己也已经写了1首英文歌曲，并寄到了这个节目;

4、你最喜欢Yesterday Once More这首歌，希望能得到歌词(lyrics);

5、你在 英语学习 上已经取得了巨大进步，感谢这个节目。

要求：语意连贯，语法正确，注意时态，80词左右。

Dear sir, Yours,

Sally

人教版八年级英语期末试题参考答案

I--III 听力部分(共20分，每小题1分)

1～5 C B C A A 6～10 B A A C C

11～15 A C C B A 16～20 C C B C A

IV 单项选择(共15分，每小题1分)

21～25 D B A A C 26～30 C D B C B 31～35 B A D C C

V 完形填空(共15分，每小题1.5分)

36～40 A C B D A 41～45 D B B A C

VI 阅读理解(共30分，每小题2分)

46～50 B A C A D 51～55 C C B D A 56～60 A B B C C

VII单词拼写(共5分，每小题1分)

61、conditions 62、encourages 63、development

64、cheating 65、perfect

VIII 补全对话(共5分，每小题1分)

66～70 F E A D C

IX 书面表达(共10分)

参考 范文 ：

Dir sir,

I’m Sally. Now I’m studying in a high school. I often turn on the radio to listen to your program when I am free or feel tired. I like your program so much, especially the English songs. I’ve listened to the program for about 3 years. So far I have learned 10 English songs through the program.

I like the song named Yesterday Once More best and I expect to get the lyrics of the song. I hope you can achieve my dream. I’ve already written an English song and sent it to your program. Thanks to your program, I have also made great progress in my English study. Wish your program more excellent.

Yours

Sally

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