英语试题含答案

英语试题含答案（共5篇）

英语试题含答案 篇1

1～5 BCBAC

6～10 CABCA

11～15 CBCCA

16～20 ABABC

21～25 BABBC

26～30 FFTFT

31～35 CBCAB

36. listening to songs

37. Why do you listen to English songs before sleep？

38. What kind of music do you like best？

39. What have you learnt from your pen friend？

40. Do you learn English by watching movies？

41. He was only fifteen years old.

42. I knew he was a clever/ smart boy， but he didnt like English at all.

43. 你确定你将送他去伦敦吗？

44. He said in it/ his letter that his spoken English was improving fast.

45. 当我听到这个消息时，我为他感到骄傲！

One possible version：

Dear Mrs. Wong，

I am very excited to write a letter to you. Im lucky to study at your school as an exchange student. My name is Du Li. I am fifteen years old. I like singing and dancing. Teachers will give us lessons all in English， wont they？ I am afraid that I wont catch up with the class， because Im not sure my English is good enough for studying at your school. So， I study English crazily these days.

I also know it is a new challenge for me to study in Hong Kong， because its fresh for me to go there. This is the first time for me to leave my parents far beyond my hometown. But Im sure I can make new friends and love local culture and school life as soon as possible. What I expect is to open and widen my horizon to learn more. Its important for me to improve my ability to study and live without parents care， isnt it？

Wow， Im so happy that the day will be coming！

Yours sincerely，

Du Li

【新目标英语九年级 Unit 2单元要点检测题参考答案】

1～5 BBACC

6～10 ABCBC

11～15 CCABA

16～20 BACAB

21～25 ACBAB

26～30 CACCA

31. Where did you go for your vacation

32. Is there anything interesting you have met

33. Did you buy anything special

34. Is the food delicious there

35. How long have you been there

36. It started to rain at 10：20.

37. They were watching the game near the river.

38. Yes， they were.

39. They went on foot.

40. He / She can eat dumplings.

One possible version：

We have discussed the ways to go on vacation. Li Ming says we should follow the agency for travel， because the guide will arrange the route. We wont worry about the room and board. We will follow the agency to come back home， so we wont get lost.

Zhang Fang advises that we should arrange the travel by ourselves. Independent travel is a new way to spend a holiday. We have free time for the vacation and we can help each other here and there because the three families are so familiar with every member.

For me， I dont agree with Li Ming. I think its too expensive to follow the agency to travel. I agree with Zhang Fang. I think its better to go for self-driving travel， because our parents can drive and we just follow the GPS. It saves a lot. We will go camping and have a picnic. How interesting it will be！

Later， Li Ming and Zhang Fang agree with me. We will drive for travel. Its an exciting thing， isnt it？

【新目标英语九年级 Unit 3单元要点检测题参考答案】

1～5 ABCCB

6～10 CABAB

11～15 CBBAC

16～20 BCBCA

21～25 ACABC

26. parents

27. September

28. draw pictures

29. Liverpool

30. returning love to / taking good care of

31. tell me your name

32. have you been a volunteer

33. It sounds great

34. No.18 Bus will not go to the Agriculture Museum

35. your English is excellent

36. 他在QQ上结交朋友，而且有的人现在成了他最好的朋友。

37. Because he wanted to save money.

38. Chen Lins school is near the Huanglong Cave.

39. 作为回报，八月份吴军邀请陈林游访衡阳市。

40. some people are dangerous for us to make friends with

One possible version：

We can understand that parents love their children very much. If parents always pick up their children to go home by car， it will make children more rely on parents. A student likes to go home by car because of his vanity. If he often does this， its not good for him to grow up.

Parents should give children more chances to develop their independent abilities. They can go home on foot， by bike or by bus. Its good for their health， isnt it？ Some students are too weak because they are lack of exercise. They will get weaker and weaker， wont they？

英语试题含答案 篇2

A

First there was learning. This has always been an important part of human life. By imitating their parents， children learned to hunt， to make tools， and to take care of themselves and others.

Next came education. This was possible only after people developed language. Then adults could explain how to do things. They could talk about traditions， beliefs， and ceremonies of the group. Still， education was oral. Children could learn only what their teachers could remember.

Finally， schools were created. They came into being because writing was invented. The first system for writing appeared about 3，500 B.C. in Sumeria， a land that is now Iraq. The Sumerians also invented a system for calculating with numbers. About 500 years later， the Egyptians discovered writing and calculation， too. And shortly after that， both the Sumerians and the Egyptians started schools. Being able to read and write they allowed people to learn anything that could be recorded. But the early systems were complicated. Children couldn‘t learn them just by watching. That’s why schools became a necessity.

Those first students learned reading， writing， and calculation. Having these skills gave people great power over those who did not have them. Some 5，000 years later， this is still true.

( )51. The main idea of this article is that schools ________.

A. had great power B. became necessary for learning

C. taught children to hunt D. developed language

答案：B

( )52. You can decide from the article that schools have ________.

A. made education difficult B. held back learning

C. imitated parents D. advanced human skills

答案：D

( )53. What happened before Egyptians discovered calculation?

A. Egyptians discovered writing. B. Egyptians started schools.

C. Sumerians invented writing. D. Sumerians started schools.

答案：C

( )54. Education became possible only with the development of _______.

A. learning B. language C. calculation D. clocks

答案：B

B

Once a landlord wanted to plant garlic in his fields. He found a group of boys and asked them to do the work for him. At lunch time he did not invite the boys to have lunch with his family. The boys had to sit by the door and have lunch on the ground. The landlord was afraid that other people would see the bad food for the boys. So with a smile on his face he said to them： “Boys， go and eat in the house. This is for your food. If you eat here by the door， the dogs will bite you.” The boys were surprised. But they said nothing and went to eat in the house. The landlord was quite pleased.

Supper time came and the boys went into the house again. When they walked past the landlord‘s room， they looked in through the window. What do you think they saw there? They saw a big table with white bread and all kinds of good food on it. The landlord and his family were sitting around the table and eating their dinner. But the food for the boys was bad. The boys were very angry. They wanted to teach the landlord a lesson. So they decided to plant his garlic upside down. And that was what they did the next day.

A few days later the garlic was coming out everywhere but not in the landlord‘s fields. The landlord was very surprised and asked the boys why this was so. “The garlic is afraid that the dogs will bite it，” the boys answered.

( )55. The landlord asked the boys to come because ________.

A. he wanted them to plant garlic for him

B. he wanted to invite them to have lunch with his family

C. he wanted to tell them to sit by the door

D. he wanted them to plant vegetables for him

答案：A

( )56. The landlord asked the boys to eat in the house because _______.

A. he was afraid the dog would eat their food

B. he was afraid the dog would bite them

C. he thought other people would see the bad food for the boys

D. he was afraid the boys would play with the dog

答案：C

( )57. The next day the boys planted the landlord‘s garlic upside down because _______.

A. they did not know how to plant it

B. they wanted to teach the landlord a lesson

C. they were afraid the dogs would bite it

D. they made a mistake

答案：B

( )58. A few days later the landlord‘s garlic did not come out because ________.

A. the garlic was afraid the dogs would bite it

B. the boys had planted it upside down

C. the boys had not planted it at all

D. the boys had not watered it

答案：B

C

The International Olympic Committee (IOC) said on February 9 it would award its highest honour to Arthur Ashe， the tennis star and human rights fighter who died on February 6 of AIDS. He was 49.

The award， called the Olympic Order， is awarded to sportsmen and others for service to the Olympics and its principled.

Ashe never participated in the Olympics， but IOC president Juan Antonio Samaranch said： “I think he was really a thorough Olympian.”

Ashe is the first black man to win Wimbledon and the only black to win the Australian US open titles.

Last April 8， he announced he had AIDS， which he got from a blood transfusion during a heart operation in 1983.

Ashe often worked for racial equality in and out of sports. He said the happiest moment of his life was not winning Wimbledon， but when Nelson Mandela―South Africa‘s antiapartheid (反N族隔x的) leader―was freed from jail in 1990.

A quote from Ashe： “I have good days and bad days. My ratio of good days to bad days is about six to one.”

( )59. The underlined word “award” in the first paragraph means “________”。

A. send a telegraph B. give a prize

C. congratulate somebody D. be in memory of somebody

答案：B

( )60. Arthur Ashe ________.

A. won Olympic gold medals in tennis

B. took part in several Olympic Games

C. was a famous sportsman in the Olympic Games which was held in South Africa

D. had not been in any Olympic games

答案：D

( )61. ________ made Ashe happier than anything else.

A. Nelson Mandela‘s freedom

B. Winning the Australian US open titles

C. Juan Antonio Samaranch‘ s congratulation

D. His good days in his life

答案：A

( )62. Which is correct?

A. There were as many good days in his life as bad days.

B. His good days were equal to his bad days.

C. He had more good days in all his life than bad days.

D. He had six good days in all his life.

答案：C

D

For some time past， it has been widely accepted that babies―and other creatures―learn to do things because certain acts lead to “rewards”， there is no reason to doubt that this is true. But it used also to be widely believed that effective rewards， at least in the early time， had to be directly connected to such basic physiological “drives” as thirst or hunger. In other words， a baby would learn if he needed food or drink or some sort of physical comfort， not otherwise.

It is now clear that this is not so. Babies will learn to behave in ways that produce results in the world with no reward except success in sight.

Papousek began his studies by using milk in the normal way to “reward” the babies and so teach them to carry out some movements， such as turning the head to one side or the other. Then he noticed that a baby who had had enough to drink would refuse the milk but would still go on making， the learned response with clear signs of pleasure. So he began to study the children‘s responses in situations where no milk was provided. He quickly found that children as young as four months would learn to turn their heads to right or left if the movement “turned on” some lights―and indeed that they were able to learn some more turns to bring about this result， for example， two left or two right， or even to make as many as three turns to one side.

Papousek‘ s light experiment was placed directly in front of the babies and he made the interesting observation that sometimes they would not turn back to watch the light closely although they would “smile and speak” when the light was on. Papousek concluded that it was not the sight of the lights which pleased them. It was the success they were achieving in solving the problem， in mastering the skill， and then there is a basic human nature to make sense of the world and bring it under control.

( )63. According to the writer， babies learn to do things which _______.

A. will satisfy their surprise B. will meet their physical needs

C. are directly connected to pleasure D. will bring them a feeling of success

答案：D

( )64. Papousek noticed in his studies that a baby _________.

A. would make learned responses when it saw the milk

B. would continue the simple movements without being given milk

C. would turn its head to right or left when it had enough to drink

D. would carry out learned movements when it had enough to drink

答案：B

( )65. The babies would “smile and speak” at the lights because ________.

A. they succeeded in “turning on” the lights

B. the sight of lights was interesting

C. they need not turn back to watch the lights

D. the lights were directly connected to some basic “drives”

答案：A

五、补全对话(共5句;每句满分为3分，共15分。)

根据中文提示，将对话中缺少的内容下在线上。这些句子必须符合英语表达习惯。打句号的地方，用陈述句;打问号的地方，用疑问句。

提示：Joe和Henry谈起报上的一篇文章，Henry问什么报，什么文章。他没用读完这篇文章，但标识下午要读，然后告别。

Joe ：Hi， have you read today‘s newspaper?

Henry：_________66___________?

Joe ：The People‘s Daily.

Henry：________67__________. But I only looked through it while having lunch.

Joe ：Did you notice an interesting article?

Henry：___________68___________?

Joe ：About air pollution.

Henry：________69__________. On which page?

Joe ：On page 5. At the bottom.

Henry：Good. I‘ll read it this afternoon.

Joe ：Don‘t forget to tell me what you think after reading it.

Henry：Sure. __________70__________.

Joe ：See you.

66.答案：Which one (do you mean)

67.答案：Yes， I did

68.答案：What article / What is it about

69.答案：Sorry， I didn‘t

70.答案：See you later

六、书面表达(共30分)

写一篇记述在海滨度周末的日记，内容包括以下几点：初夏，风和日丽;有很多游人和小船，我门捡贝壳(shell);日光浴(sun bathe)玩得很愉快。

注意：(1)行文要流;

(2)要符合日记的格式;

(3)词数为100左右。

答案：June 18， 2002， Saturday Fine

Yesterday some of my classmates and I spent our weekend at the seaside.

It was sunny and a little hot， but the water was too cool to swim in. The sea was blue and calm. It shone merrily under the bright sun. There were boats floating here and there. People in them laughed and sang happily.

We took off our shoes and went into the cool water. We walked along the beach in the water. Some girls looked for shells on the shore. Then we lay down and bathed in the sun or played games until it was time to go home.

We all enjoyed a pleasant time at the seaside.

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英语试题含答案 篇3

Tim Flowers and Tony Yeo, from Sussex University’s School of Biological Sciences, have spent several years researching how crops, such as rice, could be made to grow in water that has become salty.

The pair have recently begun a three-year programme, funded by the Biotechnology and Biological Sciences Research Council, to establish which genes enable some plants to survive salty conditions. The aim is to breed this capability into crops, starting with rice.

It is estimated that each year more than 10m hectares(公顷) of agricultural land are lost because salt gets into the soil and stunts(妨碍生长)plants. The problem is caused by several factors. In the tropics, mangroves(红树林) that create swamps(沼泽) and traditionally formed barriers to sea water have been cut down. In the Mediterranean, a series of droughts have caused the water table to drop, allowing sea water to seep(渗透)in. in Latin America, irrigation often causes problems when water is evaporated(蒸发) by the heat, leaving salt deposits behind.

Excess salt then enters the plants and prevents them functioning normally. Heavy concentrations of minerals in the plants stop them drawing up the water they need to survive.

To overcome these problems, Flowers and Yeo decided to breed rice plants that take in very little slat and store what they do absorb in cells that do not affect the plants’ growth. They have started to breed these characteristics into a new rice crop, but it will take about eight harvests before the resulting seeds are ready to be considered for commercial use.

Once the characteristics for surviving salty soil are known, Flowers and Yeo will try to breed the appropriate genes into all manners of crops and plants. Land that has been abandoned to nature will then be able to bloom again, providing much needed food in the poorer countries of the world.

31 Which of the following statements about Flowers and Yeo is true?

A They are students at Sussex University.

B They are rice breeders.

C They are husband and wife.

D They are colleagues at an institution of higher learning.

32 Flowers and Yeo have started a programme

A to find ways to prevent water pollution.

B to identify genes that promote growth in salty soil.

C to breed rice plants that taste salty.

D to find ways to remove excessive salt from soil.

33 Which of the following is NOT mentioned as a cause of the problem discussed in the passage?

A Natural barriers t

职称英语等级考试试题真题-综合A(含答案)

o sea water have been destroyed.

B the water table has gone down after droughts.

C Sea level has been continuously rising.

D Evaporation of water leaves salt behind

34 The word “affect” in Paragraph 6 could be best replaced by

A “influence”

B “effect”

C “stop”

D “present”

35 The attitude of the author towards the research project is

A positive

B negative.

C suspicious

英语试题含答案 篇4

外研 六年级下module 2 测试题 一、选出不同类的一项。（10分）()1.A.cold B.hot C.weather()2.A.meals B.breakfast C.lunch()3.A.eat B.enjoy C.sunny()4.A.cola B.tea C.noodles()5.A.week B.Monday C.Tuesday 二、单项选择。（10分）（）1.Look!It’s going to _________ soon.A.rainy B.rain C.raining()2.We are going to eat _________ ten o’clock.A.in B.on C.at()3.It’s _________ beautiful day.A.a B.an C.the()4.Let’s _________ to school.A.going B.go C.goes()5.___________ ducks are very naughty.A.This B.These C.That 三、将单词与其汉语意连线。（10分）1.duck A.热的 2.hot B.下雨 3.rain C.鸭子 4.warm D.现在[来源:学#科#网Z#X#X#K] 5.now E.温暖的 四、选词填空。（10分）when what is rain warm 1.She _________ going to have a picnic this weekend.2.________ are you going to school? 3.It’s going to be _______ in Guangzhou.4._________ are you going to do? 5.It’s going to _________ in Harbin.五、用所给单词的正确形式填空。(10分)1.We’re going to __________(have)a picnic in the park.2.What _______(be)he going to do?[来源:学§科§网Z§X§X§K] 3.It is __________(rain)now.4.It’s going to be _________(snow)tomorrow.5.When are you going to _______(play)chess? 六、连词成句。（15分）1.do, are, what, you, to, going(?)___________________________ 2.Harbin, snow, it, will, in(.)_____________________________ 3.when, eat, going, to, we, are(.)_____________________________ 4.ducks, the, sandwiches, are, our, eating(?)_____________________________ 5.will, cold, it, tomorrow, be(.)_____________________________ 七、情景匹配。（10分）（）1.It’s sixty dollars.A.What time is it?()2.I’m going to play chess.B.What are you going to do?[来源:Z,xx,k.Com]()3.It’s going to rain in Shanghai.C.When are you going to eat?()4.It’s twelve.D.How much is it?()5.We are going to eat at seven.E.How’s the weather in Shanghai? 八、完形填空。（10分）On Sundays we often go to the 1_______ near our school.There are many 2___________ in it—tigers, elephants, pandas and monkeys.The 3___________ are very big.They all have 4________ noses.Their noses can 5__________ them eat and drink.Tigers are very 6________.They ofte run about.They don’t like to 7_________ in the zoo.Many people like 8________.They are animals of China.But I like monkeys best.We like 9________ to the zoo.We can 10________ more(更多)about animals there.()1.A.park B.school C.zoo D.the shop()2.A.people B.children C.animals D.things()3.A.elephants, B.tigers C.pandas D.monkeys()4.A.long B.short C.free D.small()5.A.give B.help C.make D.get()6.A.strong B.hungry C.happy D.careful(小心)()7.A.eat B.play C.walk D.live()8.A.elephants B.pandas C.tigers D.monkeys()9.A.go B.going C.are going D.goes()10.A.see B.play C.get D.know 九、阅读短文，选择正确的答案。（15分）The summer vacation is coming soon.The students in Class One are talking about their vacations.Peter is going back to England because he wants to visit his parents.Liu Xing is going to Harbin because his uncle lives there.He is going to visit him.Cindy is going to learn to swim during the summer vacation.Lucy and Lily are twins(双胞胎).They are going to Beijing with their parents.There `are many places of interest(名胜古迹)in Beijing, such as(例如)the Summer Palace and the Palace Museum.Everyone has a good plan.()1._________ and Lily are twins.A.Lucy B.Cindy C.Linda()2.Peter is going back to __________.A.Australia B.America C.England()3.Cindy is going to learn to ____________.A.sing B.swim C.dance()4.Liu Xing is going to visit ________.A.his aunt B.his uncle C.his cousin()5.The twins are going to Beijing with __________.A.their friends B.their classmates C.their parents [来源:学科网ZXXK] [来源:学科网ZXXK] 参考答案：

一、1—5 CACCA 二、1—5 BCABB 三、1—C 2—A 3—B 4—E 5—D 四、1.snow 2.cloudy 3.hot 4.sunny 5.rain 五、1.have 2.is 3.raining 4.snowy 5.play 六、1.What are you going to do? 2.It will snow in Harbin.3.When are you going to eat? 4.The ducks are eating our sandwiches!5.It will be cold tomorrow.七、1—5 DBEAC 八、1—5 CCAAB 6—10 ADBBD 九、1—5 ACBBC

测试题参考答案 篇5

1. 某个方向距离运动形状大小2. 线段角平行相等3. 等腰直角224. 25. 答案不唯一,例如炎､从等.6. 4

7. B8. B9. D10. C11. C12. D13. D

14. 略.15. 略.16.略.17. 略,注意∠C也可求出.

《生活中的旋转》测试题

1. 一个定点沿某个方向转动一个角度 2. 相等 3. A点 ∠BAE(或∠CAF) 4. 90°120° 5. 4π 6. 180°7. 3 8. π cm2

9. A 10. A11. B12. B 13. B14. B

15. 略.

16. ①分针旋转了120°,时针旋转了10°.②时针和分针的夹角为20°.

17. (1)旋转中心是点A,旋转角度是45°.

(2)通过3次旋转组合而得的,旋转角度分别为90°,180°,270°.

18. 将△CNB绕点C顺时针旋转90°到△CN1A的位置.连接N1M.在△N1CM和△NCM中,因为CN1=CN,∠N1CM=∠NCM,CM=CM,所以△N1CM≌△NCM,MN1=MN.因为N1A=NB,在△AN1M中,∠N1AM=90°,所以AM､MN､NB可构成直角三角形.

《它们是怎样变过来的》《简单的图案设计》测试题

1. 平移 旋转 对称 2. △ACE 旋转 3. 72°4.略. 5. 射线AC方向 6. J53e8J 7. π cm

8. D 9. B 10. D 11. C 12. C 13. A

14. 略.

15. 略.

16. 略.

17. (1)△ABE绕点A逆时针方向旋转90°得到△ADF.

(2)垂直且相等.

因为△ADF是△ABE绕A点逆时针方向旋转90°得到的,所以DF=BE.∠F=∠AEB.延长BE交DF于G,因为∠ABE+∠AEB=90°,所以∠ABE+∠F=90°.故BE⊥DF.

第三章综合测试题

1. 平移旋转轴对称2. 逆 90°轴对称 3. 2BE,CF 90° 4. 旋转轴对称5. 5 5 6. 3 7. 135°8. 2

9. C 10. B 11. D 12. B 13. D 14. B15. C 16. A

17. 略.18. 略.

19. ①组成了正方形.②可以用这个图案说明勾股定理.

20. S阴影=S梯形DHGM.S梯形DHGM=(15-5+15)×8=100(cm2).

21. (1)略.(2)△APP′是等边三角形,周长=6,面积=.

22. 略.

《平行四边形的性质》测试题

1. 100° 2. 4 3. 21cm 4. 40 5. 0.8 cm,1 cm,0.8 cm,1 cm

6. 150° 7. 5 cm 8. 1

9. D 10. A 11. B 12. D 13. B 14. C

15. 因为BA⊥AC,∠B=45°,所以∠BCA=45°.△BAC是等腰直角三角形.故AB=AC=2.

由勾股定理,得BC2=AB2+AC2=(2)2+(2)2=16.

所以BC=4.故ABCD的周长=2(BC+AB)=2(4+2)=8+4.SABCD=AB·AC=8.

16. 添加BF=DE即可(答案不唯一).

由SAS可证△BCF≌△DAE,证明略.

17. 因为FE⊥AD,∠A=45°.所以△AEF是等腰直角三角形.

故AE=EF=1.

AF2=AE2+EF2=12+12=2,AF=.

因为四边形ABCD是平行四边形,所以AD=BC.又因为AF=BC.所以AD=AF=.

故DE=AD-AE=-1.

18. (1)因为AE∥DF,AF∥DE,所以四边形AEDF是平行四边形.

(2)因为DE∥AC,所以∠EDB=∠C.又因为AB=AC,所以∠B=∠C.故∠B=∠EDB.BE=DE.同理,DF=CF.

故四边形AEDF的周长=AE+DE+DF+AF=AE+BE+CF+AF=AB+AC=30.

《平行四边形的判别》测试题

1. 互相平分 2. AB=CD(答案不唯一) 3. 3 4. 4 5. BE=DF (答案不唯一)6. 3ABEC,BDEC,BEFC

7. D 8. C 9. D 10. C 11. B 12. C

13. 图中有两个平行四边形,分别是ACEB,ADFB.

因为AB=2EF,EF=DE=CD,所以AB=CE.又因为AB∥CE,所以四边形ACEB是平行四边形.同理,四边形ADFB是平行四边形.

14. 自直角顶点作斜边的垂线,沿垂线切割,并将其中一个翻转,焊接即可.理由略.

15. 四边形ABCD是平行四边形,所以AD∥BC.易证△FOD≌△EOB(AAS),所以OD=OB,即O是BD的中点.

16. 因为AD∥BP,所以BP=AD时,四边形ABPD是平行四边形,所以BP=AD=6 cm.

所以易知3 s时,四边形ABPD是平行四边形.

《菱形》测试题

1. 对边平行且相等 对角相等,邻角互补对角线互相平分互相垂直平分一组对角相等2. 24 cm3. 5 cmcm 4. 5 cmcm5. 50°40° 6. 120° 7. 3 cm 8. 4

9. C 10. C 11. D 12. C 13. C 14. B

15. (1)因为四边形ABCD是菱形,所以AD=AB.又因为E为AB中点,DE⊥AB,所以AD=BD,所以△ABD为等边三角形.所以∠ABC=2×60°=120°.(2)四边形ABCD为菱形,所以AC､BD互相垂直平分,所以OB=BD=AB=2.所以OA===2.所以AC=4.(3)S菱形ABCD=AC·BD=×4×4=8.

16. (1)AC､BD的位置关系是互相垂直.

因为四边形ABCD是平行四边形,所以AC､BD互相平分,所以OA=AC=3,OD=BD=2.又因为OA2+OD2=32+22=13=AD2 ,所以△AOD是直角三角形,所以OD⊥OA,即AC⊥BD.

(2)因为四边形ABCD是平行四边形,又因为AC⊥BD,所以四边形ABCD是菱形.

17. 添加条件DM∥AC(或DM=DF,DM=CF,ME=EF等).

△ABC中,BD=BC ,BE⊥CD,所以DE=CE. 因为DM∥AC,所以△DME≌△CFE(ASA),所以DM=CF.所以四边形DMCF是平行四边形.又因为BF⊥CD,所以四边形DMCF是菱形.

18. (1)四边形AECF是菱形.

折叠后A､C重合,所以AF=FC ,AE=EC,OA=OC.

因为 AD∥BC,所以∠OAF=∠OCE,所以△AOF≌△COE (ASA).所以AF=EC .所以AE=EC=AF=FC ,所以四边形AECF是菱形.

(2)因为AD=AF+FD ,又因为AF=FC,所以FC+FD=AD=8(cm).

在Rt△DFC中,FC2-FD2=DC2=62 .把FD=8-FC代入,得FC= cm.又因为AC==10(cm),所以OA=OC=5 cm.Rt△CFO中,OF=== (cm).所以EF= cm.

《矩形､正方形》测试题

1. 有一个角是直角 互相垂直且相等2. 24 3. 5 cm

4. 8 cm5. 106. 36cm2 7.8.

9. D 10. B 11. B 12. B 13. C 14. B(提示:延长CM与BA的延长线交于P点,连接GP,易知△AMP≌△DMC.从而由同高等底知S△AGP=S△ABG,S△MGP=S△MCG .又易知S△ABG=S△MCG,故S△ABG=S△AGP=S△MGP .S△PBM= 3S△ABG .而S△PBM=··2=)

15. 因为EF⊥CE, 所以易知∠AEF=∠DCE.所以易证△AEF≌△DCE(AAS).所以AE=DC.又因为周长为16, 所以2(AE+DE+DC)=16.所以AE=3.

16. 易知Rt△ABE≌Rt△CD′E(AAS).所以BE=D′E,AE=CE.Rt△ABE中,设AE=x,则BE=BC-CE=8-x.由AE2=AB2+BE2,所以x2=42+(8-x)2 ,x=5.所以S△AEC=AB·CE=10.

17. (1)取AB的中点M,连接ME.

易知AM=EC,∠AME=∠ECF=135°.又因为AE⊥EF,故∠FEC=∠BAE.所以△AME≌△ECF(ASA).所以AE=EF.

(2)还会成立,思路方法同上(使AM=EC).

18. (1)△ABC中,AB=AC,AD⊥BC,所以∠BAD=∠DAC.

因为AN是△ABC外角∠CAM的平分线,所以∠MAE=∠CAE.所以∠DAE=∠DAC+∠CAE=×180°=90°.

又因为AD⊥BC,CE⊥AN,所以四边形ADCE为矩形.

(2)当AD=BC时,四边形ADCE为正方形(答案不唯一).因为AB=AC,AD⊥BC于D,所以DC=BC.又AD=BC,所以DC=AD.所以矩形ADCE是正方形.

《梯形》测试题

1. 134° 52° 2. 3 2 3. 4 cm4. (5+)cm 5. 1 cm或7 cm

6.7. 7

9. D 10. C 11. B 12. B 13. C 14. A

15. S梯 形ABCD=×(2+8)×4=20.

16. (1)略.

(2)因为BE=ME,∠AEB=∠CEM=90°,∠MCE=∠BAE,所以△ABE≌△CME,所以AB=MC,MC=7.

17. 由SAS可证△ABC≌△DCB,故AB=DC.由∠1=∠2,知OB=OC,而AC=BD,故OA=OD,∠DAO=∠ADO.因∠BOC=∠AOD,故可知∠DAO=∠2,AD∥BC.

因为AB与DC不平行,所以四边形ABCD是梯形.又因为AB=DC,所以梯形ABCD是等腰梯形.

18. (1)因为AD∥BC,所以只要QC=PD,四边形PQCD即为平行四边形.此时3t=24-t,解得t=6.

(2)当PQ=CD且PD≠QC时,四边形PQCD为等腰梯形.过点P､D分别作BC的垂线,交BC于E､F两点.

所以EF=PD,QE=FC=2 cm.所以[3t-(24-t)]=2,得t=7.

《探索多边形的内角和与外角和》测试题

1. 四 2. 5 6 20 3. 135° 4. 360° 5. 3 6. 减小180° 7. 6

8. 540°

9. C 10. D 11. B 12. D 13. A 14. D

15. 120°.

16. 因为△ABC是等腰三角形,所以∠C=∠B=70°.由四边形内角和知∠EPF=140°,∠DPF=110°.

17. 设等腰梯形较小的内角为α,则3α=360°.

所以α=120°.所以等腰梯形的四个内角分别为60°､60°､120°､120°.

18. ∠DPC=180°-(∠2+∠3)=180°-(∠ADC+∠DCB).又因为∠A+∠B=360°-(∠ADC+∠DCB),所以∠DPC=(∠A+∠B).

《中心对称图形》测试题

1. 略.2. 对称中心对称中心平分 3. 形状､大小都相同 4. 5 5. 3(提示:点C､D及CD的中点) 6. 3 7. 180°120°

8. C 9. C 10. A(提示:作∠A的平分线交BC于E,过E作ED∥CA,EF∥AB) 11. B 12. C 13. C 14. B 15. B

16. 略.

17. 以点M为中心将四边形ABCD旋转180°,得到四边形A′B′C′D′.四边形ABA′B′是矩形.所以对称中心M是矩形ABA′B′对角线的交点,所以AM=BM.

18. 因为AC与BD均关于O点成中心对称,所以OA=OC,OB=OD.四边形ABCD是平行四边形.又因为BD关于AC成轴对称,所以BD⊥AC.四边形ABCD是菱形.

19. 略.

第四章综合测试题

1. 135°2. AB=BC(答案不唯一) 3. 64. 165. 20 cm26. 360° 7. 16 cm8. 增加180°不变9. 矩形(答案不唯一)

10. C11. B12. A13. C14. B

15. 85°,95°,85°,95°.

16. BE与DF的关系:BE∥DF,BE=DF.

△ADF≌△CBE(SAS).所以DF=BE,∠DFA=∠BEC,所以BE∥DF.

17. ①､②可推出,②､③也可推出.但①､③不能推出.比如,选①､②,理由如下:

因为∠CAB=∠DBA,AC=BD,AB=BA,所以△ACB≌△BDA.所以AD=BC,∠ABC=∠BAD.

作DE∥BC交AB于E,则∠DEA=∠CBA.因为∠DAE=∠CBA=∠DEA,故ED=AD=BC,四边形DEBC为平行四边形,所以AB∥CD.又因为AD不平行于BC,所以四边形ABCD是等腰梯形.

18. ①由对边平行可知四边形ANCM是平行四边形,AM=CN.又因为AB=CD,所以DM=BN.②由ANCM的面积,有AM·CF=CM·AD.因为CF=AD,故AM=CM.所以ANCM是菱形.

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