专项练习三 选择填空

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小学六年级英语毕业考试专项复习练习题【三套】

小学六年级英语毕业考试专项复习练习题【三套】

【导语】⼩学六年级的学习⽣活即将结束,你⼀定学到了很多知识,下⾯的试题,你都会做吗?认真思考,细⼼作答,相信你⼀定能取得好成绩!®⽆忧考⽹准备了以下内容,供⼤家参考。

句型练习题⼀、句型转换1. We should park our car here.(改为否定句)We park our car here.2. It means ‘No smoking’.(改为同义句) It means you .3.It means ‘Danger’.( 对画线部分提问) it ?4. They were in the bag just now.( 改否定句) in the bag just now.5.My birthday is on the 26th of May .(提问) your birthday?6. I’d like a yo-yo as a birthday present. ( 对划线部分提问)you like a birthday present?7. It is on the desk now.(⽤just now 代替now) It on the desk just now.8. They were on the playground just now.(提问) they just now?9.I watched a film last Sunday.(提问) do last Sunday?10. Were they in your bag just now?(作否定回答) _______, they ______.11. Children’s Day is on the 1st of June.( 提问)Children’s Day?12.The teapot is YangLing’s.( 提问) teapot it?13. Can I watch TV?( 作肯定回答) Yes, .14. They are watching TV.(改成否定句) They watching TV.15. There are some apple trees on the farm.(改成⼀般疑问句)apple trees on the farm?16. is, what, favourite, your, holiday( 连词成句)your favourite ?17. My birthday is on the 26th of May .( 对画线部分提问)your birthday?18. Did you have a party last birthday?(作肯定回答)_______ , I ______.19. There are some apple trees on the farm.(改成⼀般疑问句)there apple trees on the farm?⼆、⽤所给词的适当形式填空:1. Public signs ____________ (mean) different things.2. The football under the table is (he).3. Helen (visit) her grandparents on Sunday.4. Did you (watch) a film last week ?5. I'd like (have) a party.6. They are (water) flowers at home.7. We (milk) cows and picked apples on a farm.8. Helen's family (be) at home last Sunday.9. The new mirror is (she).10. She shouldn’t ________(go) to the zoo now, she must __________(stay) at home.11. Jim likes (watch) TV very much .12. Su Yang is (look) for (she) camera now.13. New Year's Day is (come).14. She (like) (listen) to music.15. People (go) to the park every morning.16. Listen! The girl (sing) over there.17. Mike (have) a blue balloon. And I (have) a green one.18. Let’s (clean) the windows.19. When’s (he) birthday?20. That sign on the wall means ‘No __________’.(smoke)21. Ben often (have) breakfast at seven in the morning.22. I (be) at school a moment ago ,I (be) at home now .23. Sunday is the (one) day of a week.24. Can you help (she) (do) housework?25. There was an __________ (excite) running race last week. All the students were very __________ (excite),26. My birthday’s on the (three) of November.27. Mike (not) like listening to music.28. Do you like (collect) stamps?29. Where are your (CD)? They (be) in the desk yesterday.30. Did you ____________(pick) oranges on the farm?31. There (be) a pair of (glass) on the sofa now.32. Your shoes (be) there just now.33. Would you like _____________ (play) football with __________ (we)?34. Ben and Jim usually (go) home together.35. __________(not walk) on the grass, please.3. You should__________(come) home at 6:00.36. What you (do) yesterday?37. ---What _________ you ________ (do) last Friday?----We ___________ (water) trees in the garden.38. I want (visit ) the farm .39. We have different (hobby).40. _________ (be) you at home yesterday? No, I ___________.41. What holiday (come) after New Year’s Day ?42. They (go) to (visit) relatives last National Day.43. Can you (play) with lanterns ? No, I .44. Did you (watch ) a film on Saturday ?45. SuYang (like) listening to music.46. They are (watch) a running race.47. Does the sign on the wall ___________ (mean) ‘Danger’?48. The earphones __________ (be) not in the study now. They __________ (be) there a moment ago. www .Xkb1 .coM49. ---What ________ you _________ (do) last Halloween?---I __________ (go) to the park and _________ (have) a lot of fun there.50. __________ your brother go shopping last night? No, he __________(do) his homework at home.51. There are three ___________ (people) in her family.52. We ___________(not have) a party last Children’s Day.53. What ______ you usually _______ (do) on Sundays?I usually ___________ (do) my homework.54. She likes ___________(dance). She can dance very _________(good).55. My little sister ____________ (not like) going shopping on Sundays.She always ________ (stay) at home.56. Let’s go and say “Happy birthday” to _______(he).57. Shall we ______ (watch)“Aladin”now?58. The boy ____________(not pull) up carrots just now, he _________(cook) food.59. Mike and his father ____________( taste) some oranges a moment ago.60. __________ your brother go shopping last night? No, he __________(do) his homework at home.61. Were there any books on the desk? No, they ___________.62. _____ (it) a cat. And these are ______ (it) food. Give ______ (they) to ____(it).63. My birthday is on the ______ (three) of July.64. Mary is ________ (write) am e-mail to her friend.65. He _______ (have) many _________ (strawberry) on the plate.66. ______ he usually have a party at the weekends? No, he ______. (do)67. There _____ (be) some orange juice in the bottle.68. We are now _______ (live) in the town.69. I _______ (visit) the farm last Sunday.70. Helen _______ (pick) many apples on the farm last week.71. Did you like ______ (milk) cows, Nancy?72. What _____ you _____ yesterday? We ______ our homework. (do)73. This is _____ (I) wallet, not _____ (he).74. Helen often ______ (go) to school by bus.75. What ______ the students _______ (do) now? They ___________ (play) football at school.76. __________ (not draw) on the wall.77. We ______ (make) lots of delicious food. And we _______ (eat) them in the dining-room yesterday evening.78. ______ (who) mirror is it? Is it _____ (your)? No, it’s not ______ (I).I think it is _____ (she) mirror. It’s _____ (she).79. _______ (I) shirt’s black, but_______ (you ) are white ._______ (she ) cat’s thin , but_______(he) is fat.80. _______ (we) pens are long, but_______ (they) are short. Miss Gao is ________(we) English teacher.形容词⽐较级练习题I.Write the answers.(根据题意,写出答案。

小学代词专项练习题

小学代词专项练习题

小学代词专项练习题一、选择填空1. 在下列句子中,“他”指的是谁?- 他正在看书。

- 妈妈叫他吃饭。

- 他家住在这栋楼里。

- 我和他一起去了公园。

答案:他正在看书。

2. 在下列句子中,“她”指的是谁?- 她穿着一件红色的裙子。

- 妈妈让她去买菜。

- 她和我一起去上学。

- 她家住在这个小区里。

答案:她穿着一件红色的裙子。

3. 在下列句子中,“它”指的是谁?- 猫躲在桌子下面。

- 附近有一家小超市,它的商品种类很多。

- 我们来到了这个城市,它的风景很美。

- 汽车的后备箱里装满了行李,但它还能装得下一些东西。

答案:附近有一家小超市,它的商品种类很多。

二、句子改写请将下列句子中的“他”或“她”改为代词“他们”或“她们”。

1. 她和她的朋友们一起去了海边。

改写后:她和她们一起去了海边。

2. 他和他的弟弟一起去参观了博物馆。

改写后:他和他们一起去参观了博物馆。

3. 她和她的家人一起去旅游了。

改写后:她和他们一起去旅游了。

三、连词填空请填写合适的代词连词,使句子通顺完整。

1. 小明爱打篮球,但是小李不喜欢。

但是小李不喜欢。

2. 不仅我喜欢吃水果,而且妈妈也很喜欢。

不仅我喜欢吃水果,而且妈妈也很喜欢。

3. 姐姐很漂亮,可是她的性格不是很好。

可是她的性格不是很好。

4. 弟弟研究很刻苦,因此他的成绩很好。

因此他的成绩很好。

四、补全句子请填写合适的代词,补全下列句子。

1. 你喜欢什么运动?我喜欢打羽毛球。

我喜欢打羽毛球。

2. 你看到张老师了吗?没有,他可能在教室里。

没有,他可能在教室里。

3. 你觉得哪个季节最美?我觉得春天最美。

我觉得春天最美。

五、改正错误请找出下列句子中的错误,并进行修改。

1. 我们看到了小猫,它站在路边。

我们看到了小猫,它站在路边。

错误:我们看到了小猫,他站在路边。

他站在路边。

修改后:我们看到了小猫,它站在路边。

它站在路边。

2. 妈妈让小明和小丽带上他的衣服去晾晒。

他的衣服去晾晒。

错误:妈妈让小明和小丽带上他们的衣服去晾晒。

人教部编版小学语文课外现代文阅读专项练习(三)(含答案)

人教部编版小学语文课外现代文阅读专项练习(三)(含答案)

人教部编版小学语文课外现代文阅读专项练习(三)(含答案)x《多读书的好处》著名的高尔基先生说过:“书籍是人类进步的阶梯。

”书还能带给你许多重要的好处。

多读书,可以让你觉得许多的写作灵感。

可以让你在写作文的方法上用的更好。

在写作的时候,我们往往可以运用一些书中的好词好句和生活哲理。

让别人觉得你更富有文采、美感。

多读书,可以让你全身都有礼节。

俗话说:“第一印象最重要。

”从你留给别人的第一印象中,就可以让别人看出你是什么样的人。

所以多读书可以让人觉得你知书达理,颇有风度。

多读书,可以让你多增加一些课外知识。

培根先生说过:“知识就是力量。

”不错,多读书,增长了课外知识,可以让你感到浑身充满了一股力量。

这种力量可以激励着你不断地前进,不断地成长。

从书中,你往往可以发现自己身似的不足之处,使你不断地改正错误,摆正自己前进的方向。

所以,书也是我们的良师益友。

多读书,可以让你变聪明,变得有智慧去战胜对手。

书让你变得更聪明,你就可以勇敢地棉队困难,让你用自己的方法来解决这个问题。

这样,你又向你自己的人生道路上迈出了一步。

多读书,也能使你的心情变得快乐。

读书也是一种休闲,一种娱乐的方式。

读书可以调节身体的血液流动,使你身心健康。

所以在书的海洋里遨游也是一种无限快乐的事情。

用读书来为自己放松心情也是一种十分明智的方式。

读书能陶冶人的情操,给人知识和智慧。

所以,我们应该多读书,为我们以后的人生道路打下好的、扎实的基础!1.写出多读书会给你带来的好处。

2.在文中找出名人名言。

3.全文有()个自然段。

4.联系上下文,理解下列词语。

良师益友:遨游:《风雪中的一盏灯》我家对面有一座山,山腰上有一所学校,童年,我就在这里上学。

隔着弯弯曲曲的小河和绿油油的稻田,我的窗户正好对着学校里张老师的窗户,我常常喜欢向那里眺望。

每晚,那个窗口都闪烁着灯光。

那一年的冬天来得特别早天气也格外冷一个风雪交加的夜晚我早早就钻进了铺得软软的被窝一觉醒来我又习惯地向对面山腰望去透过纷纷扬扬的雪花张老师的窗口像往常一样闪烁着灯光在这沉沉的雪夜这灯光显得分外明亮、耀眼,我猛然想起,张老师的木柴已经烧光了!这样冷的天,张老师拿什么取暖?我急忙翻身下床,悄悄爬上小楼阁,把大哥留着大年三十炖猪头的好木柴“背”了一捆,向对面山腰跑去。

不定代词专项练习(可编辑修改word版)

不定代词专项练习(可编辑修改word版)

不定代词专项练习一、选用适当的不定代词填空(一):A.some , any1.W ould you like more?2.T here are some apples on the table. You can take of them.B.something,nothing,anything,everything1.I s there different in today’s newspaper?2.A s I know, he knows about this old town, so you don’t have to ask him.3.I don’t think he knows about his family now.4.There is wrong with my watch. It doesn’t work.5. is ready now. Let’s start(开始)C.somebody (someone), anybody (anyone), everybody (everyone), nobody1.I di dn’t know there.2.There is in the room. It is empty(空的).3.She is friendly to . We all like to make friends with her.4.I saw pass, but I didn’t know who it was.D.everyone, every one1.The question is quite easy. can answer it.2.I believe that of us will have a present from them.E.none, nobody1. of his friends wants to help him again. He felt disappointed(失望).2.I have some books with me, but of them are the ones you like.3. wants to live in such a poor(贫穷的)house.F.e ither, each, any1.T here’s tea and coffee. You can have .2.You can find many trees on side of the river.3. of the students in her class sent her a greeting card on New Year’s Day.G.b oth, all1.There were two girls at the door. of them were smiling(微笑).2.I don’t know which mo vie is more interesting. I want to see .二、选用适当的不定代词填空(二):A. another, other, others, the other, the others1.I only found Jim and Tom there. Where are ?2.O f these three girls one comes from China and two come from Japan.3.T his sweater is a little too big for me. Can I try on(试穿) ?4.S ome like black tea, prefer(偏爱) green tea.5.I don’t like these colors. Show me some , please.6.Have you any books on this subject?7.Saying is one thing and doing is .8.It is always hard to tell the twins one from .B.few, a few, little, a little1.There is a little bird in the tree, but only people saw it.2.Could I have words with you, Miss White?3.We don’t like him, because he does for other people.4.He has friends here and he seldom goes out on weekend.5.There is only water in the pot(锅).C.neither, none, either1.I know of the two students.3.He doesn’t agree with of his parents on many things.D.one, the one, ones, one’s1.These shirts are too small. I want to have some bigger .2.Which boy is your son? —in a red cap.3. has to do best.4.I have only one small flower on my desk and she has threebig .三、选择填空:1.Have you seen the three apples on the table? You can takeof them.A. the oneB. somethingC. anythingD. any2.These trousers don’t fit(适合) me. are too long andare too short.A. Some, othersB. Some, the othersC. These, thoseD. These, the other3.Did you enjoy last night, Lucy and Lily?A. yourselvesB. yourselfC. youD. your time4.is three plus (加)four? —seven.A. How many, They areB. What number, It’sC. How much, They areD. What, It is5.W e all know he was a famous doctor , butwhen he was born.of us rememberA. fewB. a fewC. littleD. a little6.H ow many bananas do you have in your basket? —.A. NeitherB. No oneC. NothingD. None8.Her parents school teachers.A.all areB. are allC. are bothD. both are15.All the students have gone o n a field trip. There’s in the classroom. A. somebody B. anybody C. everybody D. nobody16.You can borrow my CD player, but you mustn’t lend it to . A. others B. other C. the other D. the others17.I’m free. I have everything D. nothing 18.I have four friends, many D. each to do. A. something B. anything C.of them are workers. A. both B. all C.19.They were always together. He saw she saw. A. anything B. everything C. something D. nothing20.Suddenly, Tome came in and he said he had to tell the class. A. anything important B. important everything C. something important D. important something21.He said at eh meeting and just sat there silently. A. something B. anything C. nothing D. everything22.-You look so happy. -John says I’m pretty. has ever told me that before. A. Somebody B. Anybody C. Everybody D. Nobody 23.-How many birds can you see in the tree? -. A. None B. No one C. Nobody D. No24.-Hi, Bob! I can’t find my history book. Have you seen it ? -Sorry, I haven’t. Why don’t you ask him? Perhaps he’s seen it. A. somewhere B. everywhere C. nowhere D. anywhere25.-Do you have to tell us? -No, . A. something important, nothing B. anything important, nothing C. important something, everything D. important anything, everything26.Wang Fang isn’t here. She has gone for holidays. A. whereB.anywhereC. everywhereD. somewhere27.-Have you seen my basketball? -Yes, I saw it in the classroom just now. A. where B. anywhere C. everywhere D. somewhere28.Do you hope to go ? A. warm somewhere B. anywhere warmC.warm anywhereD. somewhere warm29.We should do to protect the environment because it’s our duty. A. everything possible B. possible everything C. anything possible D. possible anything30.I agree with most of what you said, but I don’t agree with .A. anythingB. somethingC. nothingD. everything31.Did you go last Sunday? A. somewhere B. anywhere C. something D. somebody32.Everyone is her, ? A. is he B. aren’t they C. is it D. are they33.-Who will get the job? -of the them will do. A. Anybody B. Anyone C. Any one D. SomeoneI.用some、any 填空。

小学数学五年级下册长方体、正方体表面积1专项练习

小学数学五年级下册长方体、正方体表面积1专项练习

一、填空(36分)1.长方体有()个面,()条棱,()个顶点。

相对的棱的长度(),相对的面完全()。

2. 一个长方体的棱长之和是104厘米,长7厘米,宽9厘米,高()厘米。

3. 一个长方体的长是15厘米,宽是12厘米,高是8厘米,这个长方体的表面积是()平方厘米。

4、一个正方体的棱长是12分米,它的棱长总和是(),表面积是()。

5、用60厘米长的铁丝焊接成一个正方体的框架,这个正方体的表面积是()平方厘米。

6、用铁丝焊接成一个长12厘米,宽10厘米,高5厘米的长方体的框架,至少需要铁丝()厘米。

7、一个长方体的长是25厘米,宽是20厘米,高是18厘米,最大的面的长是()厘米,宽是()厘米,一个这样的面的面积是()平方厘米;最小的面长是()厘米,宽是()厘米,一个这样的面的面积是()平方厘米。

8、一个长方体的长是1米4分米,宽是5分米,高是5分米,这个长方体有()个面是正方形,每个面的面积是()平方分米;其余四个面是长方形的面积大小(),每个面的面积是()平方分米;这个长方体的表面积是()平方分米。

9、一个长方体的金鱼缸,长是8分米,宽是5分米,高是6分米,不小心前面的玻璃被打坏了,修理时配上的玻璃的面积是()。

10、一个正方体的棱长总和是72厘米,它的一个面是边长()厘米的正方形,它的表面积是()平方厘米。

11.一个长方体灯笼框架的长、宽、高分别是40cm、30cm、30cm,制作这样一个框架需要()米木条。

12.把3个棱长1厘米的正方体拼成长为3厘米的一个长方体,它的表面积为()。

13.把4个棱长2厘米的正方体拼成一个长方体,它的表面积是()或()。

14.一个长方体的长是8分米,宽6分米,高4分米,把它切成两个小长方体,这两个小长方体的表面积和最大是()。

15.一个长方体,长4米,宽3米,高2米,占地面积最大是()。

16.把一个表面积为24平方分米的正方体平均分为两个长方体,表面积增加了()。

专题03 选词填空(含解析)-(2025年)外研版(三起)英语五年级上册期中专项练习

专题03 选词填空(含解析)-(2025年)外研版(三起)英语五年级上册期中专项练习

期中专项复习03 选词填空学校:___________姓名:___________班级:___________考号:___________一、填空题。

1.—Did you come back yesterday?—No, we back last Sunday. (come / came)2.Yesterday Lingling to London Town. (go / went)3.Did you John yesterday? (met / meet)4.There’s our bus! up! (Wait / Hurry)5.Do you in London? (live / lived)6.This is our friend, Lingling. (Chinese / China)7.Hello! How you? (is / are)8.(Amy’s / Amy) trousers are clean.9.We bought a lot of . (chocolate /chocolates).10.Here’s a present (from / by) Daming.11.(Did / Do) your father come back yesterday?12.I’ll make a (lost / shopping) list.13.I (ate / can) it all.14.We didn’t buy (some / any) bananas.15.— (How many / How much) cheese did you buy?—Half a kilo.16.It took one hour to go to the park. (we / us)17.What did you do ? (at the weekend / in the weekend)18.Daming and Lily went there . (by the bus / by bus)19.— (Where / What) did you see in the zoo?—I saw lots of animals.20.— (What / How) did you go to Hainan?—By plane.21.I had breakfast (in / at) seven o’clock in the morning.22.Amy didn’t (buy / bought) the yellow T-shirt last week.24.How many do you want? (pears / pear)25.Please out the notebooks. (gave / give)26.There a bird on the desk. (are / is)27.There are twenty-three in my class. (child / children) 28.There is only one (child / children) in the classroom. 29.Look! The children are playing (happy / happily). 30.Three dogs have (twelve / twenty) legs. 31.(How many / How much) children are there? 32.Please give (out / in) the books.二、根据句意,从方框中选词填空。

最新中考数学三角形全等专项练习 选择30、填空10、解答20 附解题过程

最新中考数学三角形全等专项练习 选择30、填空10、解答20 附解题过程

最新中考数学三角形全等专项练习选择题30道,填空题10道,解答题20道一、选择题1.如图,△ABC≌△DEF,BE=4,AE=1,则DE的长是()A.5B.4C.3D.2解:∵△ABC≌△DEF,∴DE=AB,∵BE=4,AE=1,∴DE=AB=BE+AE=4+1=5,故选A.2.如图所示,∠E=∠F=90°,∠B=∠C,AE=AF,结论:①EM=FN;②CD=DN;③∠FAN=∠EAM;④△ACN≌△ABM.其中正确的有()A.1个B.2个C.3个D.4个解:∵,∴△AEB≌△AFC;(AAS)∴∠FAM=∠EAN,∴∠EAN-∠MAN=∠FAM-∠MAN,即∠EAM=∠FAN;(故③正确)又∵∠E=∠F=90°,AE=AF,∴△EAM≌△FAN;(ASA)∴EM=FN;(故①正确)由△AEB≌△AFC知:∠B=∠C,AC=AB;又∵∠CAB=∠BAC,∴△ACN≌△ABM;(故④正确)由于条件不足,无法证得②CD=DN;故正确的结论有:①③④;故选C.3.用直尺和圆规作一个角等于已知角的示意图如下,则说明∠A′O′B′=∠AOB的依据是()A.(S.S.S.)B.(S.A.S.)C.(A.S.A.)D.(A.A.S.)解:作图的步骤:①以O为圆心,任意长为半径画弧,分别交OA、OB于点C、D;②任意作一点O′,作射线O′A′,以O′为圆心,OC长为半径画弧,交O′A′于点C′;③以C′为圆心,CD长为半径画弧,交前弧于点D′;④过点D′作射线O′B′.所以∠A′O′B′就是与∠AOB相等的角;作图完毕.在△OCD与△O′C′D′,,∴△OCD≌△O′C′D′(SSS),∴∠A′O′B′=∠AOB,显然运用的判定方法是SSS.故选A.4.如图,已知AB=AD,那么添加下列一个条件后,仍无法判定△ABC≌△ADC 的是()A.∠BCA=∠DCA B.∠BAC=∠DAC C.∠B=∠D=90°D.C B=CD解:A、添加∠BCA=∠DCA时,不能判定△ABC≌△ADC,故A选项符合题意;B、添加∠BAC=∠DAC,根据SAS,能判定△ABC≌△ADC,故B选项不符合题意;C、添加∠B=∠D=90°,根据HL,能判定△ABC≌△ADC,故C选项不符合题意;D、添加CB=CD,根据SSS,能判定△ABC≌△ADC,故D选项不符合题意;故选A.5.如图所示,正方形ABCD中,点E是CD边上一点,连接AE,交对角线BD 于点F,连接CF,则图中全等三角形共有()A.1对B.2对C.3对D.4对解:∵AD=CD,∠ADB=∠CDB=45°,DF=DF;∴△ADF≌△CDF;同理可得:△ABF≌△CBF;∵AD=CD,AB=BC,BD=BD∴△ABD≌△CBD.因此本题共有3对全等三角形,故选C.6 .如图,在△ABC与△DEF中,已有条件AB=DE,还需添加两个条件才能使△ABC≌△DEF,不能添加的一组条件是()A.∠B=∠E,BC=EF B.BC=EF,AC=DFC.∠A=∠D,∠B=∠E D.∠A=∠D,BC=EF解:A、添加∠B=∠E,BC=EF可用SAS判定两个三角形全等,故A选项正确;B、添加BC=EF,AC=DF可用SSS判定两个三角形全等,故B选项正确;C、添加∠A=∠D,∠B=∠E可用ASA判定两个三角形全等,故C选项正确;D、添加∠A=∠D,BC=EF后是SSA,无法证明三角形全等,故D选项错误.故选D.7.如图,已知∠1=∠2,AC=AD,增加下列条件:①AB=AE;②BC=ED;③∠C=∠D;④∠B=∠E.其中能使△ABC≌△AED的条件有()A.4个B.3个C.2个D.1个解:已知∠1=∠2,AC=AD,由∠1=∠2可知∠BAC=∠EAD,加①AB=AE,就可以用SAS判定△ABC≌△AED;加③∠C=∠D,就可以用ASA判定△ABC≌△AED;加④∠B=∠E,就可以用AAS判定△ABC≌△AED;加②BC=ED只是具备SSA,不能判定三角形全等.其中能使△ABC≌△AED的条件有:①③④故选B.8.如图:在平行四边形ABCD中,AB≠BC,AE、CF分别为∠BAD、∠BCD的平分线,连接BD,分别交AE、CF于点G、H,则图中的全等三角形共有()A.3对B.4对C.5对D.6对解:先从平行四边形的性质入手,得到AD=CB,AB=CD,∠BAD=∠DCB,∠ABC=∠CDA,再由角平分线的性质得到∠BAE=∠DAE=∠DCF=∠BCF,从而先得到:△ABD≌△CDB,△ABE≌△CDF,进而得到△ABG≌△CDH,△ADG≌△CBH,△BGE≌△DHF.所以全等三角形共5对,分别是:△ABD≌△CDB(SSS),△ABE≌△CDF(ASA),△ABG≌△CDH(ASA),△ADG≌△CBH(ASA),△BGE≌△DHF(AAS).故选C.9 .如图,在△ABC与△DEF中,给出以下六个条件:(1)AB=DE;(2)BC=EF;(3)AC=DF;(4)∠A=∠D;(5)∠B=∠E;(6)∠C=∠F.以其中三个作为已知条件,不能判断△ABC与△DEF全等的是()A.(1)(5)(2) B.(1)(2)(3) C.(4)(6)(1) D.(2)(3)(4)解:A、正确,符合判定方法SAS;B、正确,符合判定方法SSS;C、正确,符合判定方法AAS;D、不正确,不符合全等三角形的判定方法.故选D.10.下列说法中,正确的是()A.两腰对应相等的两个等腰三角形全等B.两锐角对应相等的两个直角三角形全等C.两角及其夹边对应相等的两个三角形全等D.面积相等的两个三角形全等解:A、两腰对应相等的两个等腰三角形,只有两边对应相等,所以不一定全等;B、两锐角对应相等的两个直角三角形,缺少对应的一对边相等,所以不一定全等;C、两角及其夹边对应相等的两个三角形全等,符合ASA;D、面积相等的两个三角形不一定全等.故选C.11.如图,AC、BD是长方形ABCD的对角线,过点D作DE∥AC交BC的延长线于E,则图中与△ABC全等的三角形共有()A.1个B.2个C.3个D.4个解:①在△ABC和△ADC中,∴△ABC≌△ADC(SAS);②∵在△ABC和△DBC中,,∴△ABC≌△DBC(SAS);③∵在△ABC和△ABD中,,∴△ABC≌△ABD(SAS);④∵DE∥AC,∴∠ACB=∠DEC,∵在△ABC和△DCE中,,∴△ABC≌△DCE(AAS).故选D.12.如图,△ABC是等腰直角三角形,∠ACB=90°,AC=BC,若CD⊥AB,DE⊥BC 垂足分别是D、E.则图中全等的三角形共有()A.2对B.3对C.4对D.5对解:∵∠ACB=90°,AC=BC,CD⊥AB,CD=CD,∴△CAD≌△CBD.(HL)同理可证明△CDE≌△BDE.故选A.13.如图,OA=OB,OC=OD,∠O=50°,∠D=35°,则∠AEC=()A.60°B.50°C.45°D.30°解:∵在△AOD中,∠O=50°,∠D=35°,∴∠OAD=180°-50°-35°=95°,∵在△AOD与△BOC中,OA=OB,OC=OD,∠O=∠O,∴△AOD≌△BOC,故∠OBC=∠OAD=95°,在四边形OBEA中,∠AEB=360°-∠OBC-∠OAD-∠O,=360°-95°-95°-50°,=120°,又∵∠AEB+∠AEC=180°,∴∠AEC=180°-120°=60°.故选A.14.如图,在△ABC和△BDE中,点C在边BD上,边AC交边BE于点F.若AC=BD,AB=ED,BC=BE,则∠ACB等于()A.∠EDB B.∠BED C.∠AFB D.2∠ABF解:在△ABC和△DEB中,,∴△ABC≌△DEB (SSS),∴∠ACB=∠DBE.∵∠AFB是△BFC的外角,∴∠ACB+∠DBE=∠AFB,∠ACB=∠AFB,故选C.15.如图所示,已知△ABC和△DCE均是等边三角形,点B,C,E在同一条直线上,AE与BD与BD交于点O,AE与CD交于点G,AC与BD交于点F,连接OC,FG,其中正确结论的个数是()①AE=BD;②AG=BF;③FG∥BE;④∠BOC=∠EOC.A.1个B.2个C.3个D.4个解:(1)△ABC和△DCE均是等边三角形,点B,C,E在同一条直线上,∴AC=BC,EC=DC,∠ACB=∠DCE=60°,∴∠ACE=∠BCD=120°,在△BCD和△ACE中∵,∴△BCD≌△ACE∴AE=BD,故结论①正确;(2)∵△BCD≌△ECA,∴∠GAC=∠FBC,又∵∠ACG=∠BCF=60°,AC=BC∴△ACG≌△BCF,∴AG=BF,故结论②正确;(3)∠DCE=∠ABC=60°,∴DC∥AB,∴,∵∠ACB=∠DEC=60°,∴DE∥AC,∴=,∴,∴FG∥BE,故结论③正确;(4)过C作CN⊥AE于N,CZ⊥BD于Z,则∠CNE=∠CZD=90°,∵△ACE≌△BCD,∴∠CDZ=∠CEN,在△CDZ和△CEN中∵,∴△CDZ≌△CEN,∴CZ=CN,∵CN⊥AE,CZ⊥BD,∴∠BOC=∠EOC,故结论④正确.故选D.16.如图,已知△ABC中,∠ABC=45°,AC=4,H是高AD和BE的交点,则线段BH的长度为()A.B.4C.D.5解:∵∠ABC=45°,AD⊥BC,∴AD=BD,∠ADC=∠BDH,∵∠AHE+∠DAC=90°,∠DAC+∠C=90°,∴∠AHE=∠BHD=∠C,∴△ADC≌△BDH,∴BH=AC=4.故选B.17.如图,已知等边△ABC中,BD=CE,AD与BE相交于点P,则∠APE的度数为()A.45°B.60°C.55°D.75°解:等边△ABC中,有∵,∴△ABD≌△BCE(SAS),∴∠BAD=∠CBE,∴∠APE=∠BAD+∠ABP=∠ABP+∠PBD=∠ABD=60°.故选B.18.如图,△ABD与△ACE均为正三角形,且AB<AC,则BE与CD之间的大小关系是()A.B E=CD B.BE>CDC.B E<CD D.大小关系不确定解:∵△ABD与△ACE均为正三角形,∴BA=DA,AE=AC,∠BAD=∠CAE=60°,∴∠BAE=∠DAC,∴△BAE≌△DAC,∴BE=CD,故选A.19.如图,将两根钢条AA′、BB′的中点O连在一起,使AA′、BB′可以绕着点O自由转动,就做成了一个测量工件,由三角形全等得出A′B′的长等于内槽宽AB;那么判定△OAB≌△OA′B′的理由是()A.边角边B.角边角C.边边边D.角角边解:△OAB与△OA′B′中,∵AO=A′O,∠AOB=∠A′OB′,BO=B′O,∴△OAB≌△OA′B′(SAS).故选A.20.如图,过边长为1的等边△ABC的边AB上一点P,作PE⊥AC于E,Q为BC延长线上一点,当PA=CQ时,连PQ交AC边于D,则DE的长为()A.B.C.D.不能确定解:过P作PM∥BC,交AC于M;∵△ABC是等边三角形,且PM∥BC,∴△APM是等边三角形;又∵PE⊥AM,∴AE=EM=AM;(等边三角形三线合一)∵PM∥CQ,∴∠PMD=∠QCD,∠MPD=∠Q;又∵PA=PM=CQ,在△PMD和△QCD中∴△PMD≌△QCD(AAS);∴CD=DM=CM;∴DE=DM+ME=(AM+MC)=AC=,故选B.21.如图,在边长为4的等边三角形ABC中,AD是BC边上的高,点E,F是AD上的两点,则图中阴影部分的面积是()A.4B.3C.2D.解:∵等边三角形ABC,AD⊥BC,∴BD=DC,∠CDF=∠BDF=90°∴△BDF≌△CDF同理可证:△BDE≌△CDE,△ABD≌△ACD,∴△BEF≌△CEF,△ABE≌△ACE∴S阴影=S△ABC=×∵AB=4,AD==2,∴S 阴影==.故选C.22.如图,在Rt△ABC中,AB=AC,AD⊥BC,垂足为D.E、F分别是CD、AD上的点,且CE=AF.如果∠AED=62°,那么∠DBF=()A.62°B.38°C.28°D.26°解:∵AB=AC,AD⊥BC,∴BD=CD.又∵∠BAC=90°,∴BD=AD=CD.又∵CE=AF,∴DF=DE.∴Rt△BDF≌Rt△ADE(SAS).∴∠DBF=∠DAE=90°-62°=28°.故选C.23.如图,已知△ABC中,∠ABC=90°,AB=BC,三角形的顶点在相互平行的三条直线l1,l2,l3上,且l1,l2之间的距离为2,l2,l3之间的距离为3,则AC 的长是()A.B.C.D.7解:作AD⊥l3于D,作CE⊥l3于E,∵∠ABC=90°,∴∠ABD+∠CBE=90°又∠DAB+∠ABD=90°∴∠BAD=∠CBE,,∴△ABD≌△BCE,∴BE=AD=3在Rt△BCE中,根据勾股定理,得BC==,在Rt△ABC中,根据勾股定理,得AC=×=2;故选A.24.如图,在▱ABCD中,分别以AB、AD为边向外作等边△ABE、△ADF,延长CB交AE于点G,点G在点A、E之间,连接CE、CF,EF,则以下四个结论一定正确的是()①△CDF≌△EBC;②∠CDF=∠EAF;③△ECF是等边三角形;④CG⊥AE.A.只有①②B.只有①②③C.只有③④D.①②③④解:∵△ABE、△ADF是等边三角形,∴FD=AD,BE=AB∵AD=BC,AB=D,C∴FD=BC,BE=DC∵∠B=∠D,∠FDA=∠ABE,∴∠CDF=∠EBC,∴△CDF≌△EBC,故①正确;∵∠FAE=∠FAD+∠EAB+∠BAD=60°+60°+(180°-∠CDA)=300°-∠CDA,∠FDC=360°-∠FDA-∠ADC=300°-∠CDA,∴∠CDF=∠EAF,故②正确;同理可得:∠CBE=∠EAF=∠CDF,∵BC=AD=AF,BE=AE,∴△EAF≌△EBC,∴∠AEF=∠BEC,∵∠AEF+∠FEB=∠BEC+∠FEB=∠AEB=60°,∴∠FEC=60°,∵CF=CE,∴△ECF是等边三角形,故③正确;在等边三角形ABE中,∵等边三角形顶角平分线、底边上的中线、高和垂直平分线是同一条线段∴如果CG⊥AE,则G是AE的中点,∠ABG=30°,∠ABC=150°,题目缺少这个条件,CG⊥AE不能求证,故④错误.故选B.25.已知:如图,在正方形ABCD外取一点E,连接AE、BE、DE.过点A作AE的垂线交DE于点P.若AE=AP=1,PB=.下列结论:①△APD≌△AEB;②点B到直线AE的距离为;③EB⊥ED;④S △APD+S△APB=1+;⑤S正方形ABCD=4+.其中正确结论的序号是()A.①③④B.①②⑤C.③④⑤D.①③⑤解:①∵∠EAB+∠BAP=90°,∠PAD+∠BAP=90°,∴∠EAB=∠PAD,又∵AE=AP,AB=AD,∴△APD≌△AEB(故①正确);③∵△APD≌△AEB,∴∠APD=∠AEB,又∵∠AEB=∠AEP+∠BEP,∠APD=∠AEP+∠PAE,∴∠BEP=∠PAE=90°,∴EB⊥ED(故③正确);②过B作BF⊥AE,交AE的延长线于F,∵AE=AP,∠EAP=90°,∴∠AEP=∠APE=45°,又∵③中EB⊥ED,BF⊥AF,∴∠FEB=∠FBE=45°,又∵BE===,∴BF=EF=(故②不正确);④如图,连接BD,在Rt△AEP中,∵AE=AP=1,∴EP=,又∵PB=,∴BE=,∵△APD≌△AEB,∴PD=BE=,∴S △ABP+S△ADP=S△ABD-S△BDP=S正方形ABCD-×DP×BE=×(4+)-××=+.(故④不正确).⑤∵EF=BF=,AE=1,∴在Rt△ABF中,AB2=(AE+EF)2+BF2=4+,∴S 正方形ABCD=AB2=4+(故⑤正确);故选D.26.如图,在正方形ABCD中,点E、F分别在CD、BC上,且BF=CE,连接BE、AF相交于点G,则下列结论不正确的是()A.B E=AF B.∠DAF=∠BECC.∠AFB+∠BEC=90°D.A G⊥BE解:∵ABCD是正方形,∴∠ABF=∠C=90°,AB=BC∵BF=CE,∴△ABF≌△BCE,∴AF=BE(第一个正确)∠BAF=∠CBE,∠BFA=∠BEC(第三个错误)∵∠BAF+∠DAF=90°,∠BAF+∠BFA=90°,∴∠DAF=∠BEC(第二个正确)∵∠BAF=∠CBE,∠BAF+∠AFB=90°,∴∠CBE+∠AFB=90°,∴AG⊥BE(第四个正确)故选C.27.如图,在等腰梯形ABCD中,AD∥BC,对角线AC,BD相交于点O,有如下四个结论:①AC=BD;②AC⊥BD;③等腰梯形ABCD是中心对称图形;④△AOB≌△DOC.则正确的结论是()A.①④B.②③C.①②③D.①②③④解:①正确,等腰梯形的两条对角线相等.②不正确,无法得到.③不正确,等腰梯形是轴对称图形,不是中心对称图形.④正确,∵AB=DC,AD=DA,AC=DB,∴△ABD≌△DCA,∴∠ABD=∠DCA,∵∠AOB=∠DOC,∴△AOB≌△DOC.故选A.28.如图,已知两个全等直角三角形的直角顶点及一条直角边重合,将△ABC绕点C按顺时针方向旋转到△A′CB′的位置,其中A′C交直线AD于点E,A′B′分别交直线AD,AC于点F,G.则旋转后的图中,全等三角形共有()A.2对B.3对C.4对D.5对解:旋转后的图中,全等的三角形有:△B′CG≌△DCE,△A′B′C≌△ADC,△AGF≌△A′EF,△ACE≌△A′CG,共4对.故选C.29.如图,△ACD和△AEB都是等腰直角三角形,∠CAD=∠EAB=90°,四边形ABCD是平行四边形,下列结论中错误的是()A.△ACE以点A为旋转中心,逆时针方向旋转90°后与△ADB重合B.△ACB以点A为旋转中心,顺时针方向旋转270°后与△DAC重合C.沿AE所在直线折叠后,△ACE与△ADE重合D.沿AD所在直线折叠后,△ADB与△ADE重合解:A、根据题意可知AE=AB,AC=AD,∠EAC=∠BAD=135°,△EAC≌△BAD,旋转角∠EAB=90°,正确;B、因为平行四边形是中心对称图形,要想使△ACB和△DAC重合,△ACB应该以对角线的交点为旋转中心,顺时针旋转180°,即可与△DAC重合,错误;C、根据题意可知∠EAC=135°,∠EAD=360°-∠EAC-∠CAD=135°,AE=AE,AC=AD,△EAC≌△EAD,正确;D、根据题意可知∠BAD=135°,∠EAD=360°-∠BAD-∠BAE=135°,AE=AB,AD=AD,△EAD≌△BAD,正确.故选B.30.如图直角梯形ABCD中,AD∥BC,AB⊥BC,∠BCD=45°,AD=2,BC=3,将腰CD以D为中心逆时针旋转90°至ED,连AE、CE,则△ADE的面积是()A.1B.2C.3D.不能确定解:作EF⊥AD交AD延长线于F,作DG⊥BC.∵CD以D为中心逆时针旋转90°至ED,∵AD=2,BC=3,∠BCD=45°,∴DG=CG,∴DE=DC,DE⊥DC,∠CDG=∠EDF,∴△CDG≌△EDF,∴DF=DG=CG=3-2=1,EF=GC=1,∴△ADE的面积是:×2×1=1.故选A.二、填空题1.如图,若△OAD≌△OBC,且∠O=65°,∠C=20°,则∠OAD=_______°.解:∵△OAD≌△OBC,∴∠OAD=∠OBC;在△OBC中,∠O=65°,∠C=20°,∴∠OBC=180°-(65°+20°)=180°-85°=95°;∴∠OAD=∠OBC=95°.2 .已知△ABC中,AB=BC≠AC,作与△ABC只有一条公共边,且与△ABC全等的三角形,这样的三角形一共能作出_______个.解:以AB为公共边有三个,以CB为公共边有三个,以AC为公共边有一个,所以一共能作出7个.故答案为:7.3.如图,已知CD⊥AB,BE⊥AC,垂足分别为D、E,BE、CD交于点O,且AO平分∠BAC,那么图中全等三角形共有_______对.解:∵CD⊥AB,BE⊥AC,垂足分别为D、E,且AO平分∠BAC,∴△ODA≌△OEA,∴∠B=∠C,AD=AE,∴△ADC≌△AEB,∴AB=AC,∴△OAC≌△OAB,∴△COE≌△OBD.故填4.4.如图,在△ABC中,AD平分∠BAC,AB=AC-BD,则∠B:∠C的值是_______.解:在AC上截取AE=AB=X,于是AB=AE又∵AD平分∠BAC∴∠BAD=∠EAD又∵AD=AD∴△ABD≌△AED∴∠1=∠B,DE=BD=CE=X∴在等腰三角形DEC中,∠B=∠1=2∠C∴∠B:∠C=2:1或2.5.如图,OA=OB,OC=OD,∠O=60°,∠C=25°,则∠BED等于_______°.解:∵OA=OB,OC=OD,∠O=60°,∴△OAD≌△OBC,∴∠D=∠C=25°,∵∠DBE=∠O+∠C=85°,∴∠BED=180°-25°-85°=70°.6.如图,在等边△ABC中,D、E分别是AB、AC上的点,且AD=CE,则∠BCD+∠CBE=_______°.解:∵△ABC是等边三角形,∴∠A=∠ACB=60°,AC=BC,∵AD=CE,∴△ADC≌△CEB,∴∠ACD=∠CBE∴∠BCD+∠CBE=∠BCD+∠ACD=∠ACB=60°.7.如图,在△ABC中,∠C=90°,∠CAB=50°.按以下步骤作图:①以点A为圆心,小于AC的长为半径画弧,分别交AB、AC于点E、F;②分别以点E、F 为圆心,大于EF的长为半径画弧,两弧相交于点G;③作射线AG交BC边于点D.则∠ADC的度数为_______.解:解法一:连接EF.∵点E、F是以点A为圆心,小于AC的长为半径画弧,分别与AB、AC的交点,∴AF=AE;∴△AEF是等腰三角形;又∵分别以点E、F为圆心,大于EF的长为半径画弧,两弧相交于点G;∴AG是线段EF的垂直平分线,∴AG平分∠CAB,∵∠CAB=50°,∴∠CAD=25°;在△ADC中,∠C=90°,∠CAD=25°,∴∠ADC=65°(直角三角形中的两个锐角互余);解法二:根据已知条件中的作图步骤知,AG是∠CAB的平分线,∵∠CAB=50°,∴∠CAD=25°;在△ADC中,∠C=90°,∠CAD=25°,∴∠ADC=65°(直角三角形中的两个锐角互余);故答案是:65°.8.如图,直线L过正方形ABCD的顶点B,点A、C到直线L的距离分别是1和2,则正方形的边长是_______.解:如图,∵四边形ABCD是正方形,∴AB=CD,∠ABM+∠CBN=90°,而AM⊥MN,CN⊥BN,∴∠BAM=∠CBN,∠AMB=∠CNB=90°,∴△AMB≌△BCN(AAS),∴BM=CN,∴AB为.9.已知:如图,正方形ABCD中,对角线AC和BD相交于点O.E、F分别是边AD、CD上的点,若AE=4cm,CF=3cm,且OE⊥OF,则EF的长为_______cm.解:连接EF,作OM⊥AB于点M,∵OD=OC,∵OE⊥OF∴∠EOD+∠FOD=90°∵正方形ABCD∴∠COF+∠DOF=90°∴∠EOD=∠FOC而∠ODE=∠OCF=45°∴△OFC≌△OED,∴OE=OF,CF=DE=3cm,则AE=DF=4,根据勾股定理得到EF==5cm.10.如图,有一块边长为4的正方形塑料模板ABCD,将一块足够大的直角三角板的直角顶点落在A点,两条直角边分别与CD交于点F,与CB延长线交于点E.则四边形AECF的面积是_______.解:∵四边形ABCD为正方形,∴∠D=∠ABC=90°,AD=AB,∴∠ABE=∠D=90°,∵∠EAF=90°,∴∠DAF+∠BAF=90°,∠BAE+∠BAF=90°,∴∠DAF=∠BAE,在△AEB和△AFD中,∵,∴△AEB≌△AFD(ASA),∴S△AEB=S△AFD,∴它们都加上四边形ABCF的面积,可得到四边形AECF的面积=正方形的面积=16.三、解答题1.已知:如图,点E是正方形ABCD的边CD上一点,点F是CB的延长线上一点,且EA⊥AF.求证:DE=BF.解:证明:∵∠FAB+∠BAE=90°,∠DAE+∠BAE=90°,∴∠FAB=∠DAE,∵∠AB=AD,∠ABF=∠ADE,∴△AFB≌△ADE,∴DE=BF.2.如图,四边形ABCD的对角线AC、BD相交于点O,△ABC≌△BAD.求证:(1)OA=OB;(2)AB∥CD.证明:(1)∵△ABC≌△BAD,∴∠CAB=∠DBA,∴OA=OB.(2)∵△ABC≌△BAD,∴AC=BD,又∵OA=OB,∴AC-OA=BD-OB,即:OC=OD,∴∠OCD=∠ODC,∵∠AOB=∠COD,∠CAB=,∠ACD=,∴∠CAB=∠ACD,∴AB∥CD.3.如图,▱ABCD的两条对角线AC、BD相交于点O.(1)图中有哪些三角形是全等的?(2)选出其中一对全等三角形进行证明.解:(1)△AOB≌△COD、△AOD≌△COB、△ABD≌△CDB、△ADC≌△CBA;(2)以△AOB≌△COD为例证明;∵四边形ABCD是平行四边形,∴OA=OC,OB=OD.在△AOB和△COD中,OA=OC,∠AOB=∠COD,OB=OD,∴△AOB≌△COD.4.如图,已知AD是△ABC的角平分线,在不添加任何辅助线的前提下,要使△AED≌△AFD,需添加一个条件是:_______,并给予证明.解:①添加条件:AE=AF,证明:在△AED与△AFD中,∵AE=AF,∠EAD=∠FAD,AD=AD,∴△AED≌△AFD(SAS),②添加条件:∠EDA=∠FDA,证明:在△AED与△AFD中,∵∠EAD=∠FAD,AD=AD,∠EDA=∠FDA,∴△AED≌△AFD(ASA).5.如图,在8×8的正方形网格中,△ABC的顶点和线段EF的端点都在边长为1的小正方形的顶点上.(1)填空:∠ABC=_______°,BC=_______.(2)请你在图中找出一点D,再连接DE、DF,使以D、E、F为顶点的三角形与△ABC全等,并加以证明.(1)解:依题意得∠ABC=135°,BC为边长为2的正方形的对角线,则BC=2;(2)证明:∵FD 3=FD4=ED2=ED3=BC=,∴∠EFD3=∠EFD4=∠FED2=∠FED1=∠ABC=90°+45°=135°,EF=AB=2,∴△FED1≌△FED2≌△EFD3≌△EFD4≌△ABC.6.如图,在△ABC中,∠ACB=90°,AC=BC,CE⊥BE,CE与AB相交于点F,AD⊥CF于点D,且AD平分∠FAC,请写出图中两对全等三角形,并选择其中一对加以证明.解:△ADC≌△ADF、△ADC≌△CEB,若选择△ADC≌△ADF,证明如下:∵AD平分∠FAC,∴∠CAD=∠FAD,∵AD⊥CF,∴∠ADC=∠ADF=90°,在△ADC和△ADF中,,∴△ADC≌△ADF(ASA).7.如图所示,将一长方形纸片ABCD折叠,使点C与点A重合,点D落在点E处,折痕为MN,图中有全等三角形吗?若有,请找出并证明.解:有,△ABN≌△AEM.证明:∵四边形ABCD是长方形,∴AB=DC,∠B=∠C=∠DAB=90°∵四边形NCDM翻折得到四边形NAEM,∴AE=CD,∠E=∠D=90°,∠EAN=∠C=90°.∴AB=AE,∠B=∠E,∠DAB=∠EAN,即:∠BAN+∠NAM=∠EAM+∠NAM,∴∠BAN=∠EAM.在△ABN与△AEM中,∴△ABN≌△AE M(ASA).8.如图,△ABC中,AB=AC,延长BC至D,使CD=BC,点E在边AC上,以CE,CD为邻边做▱CDFE,过点C作CG∥AB交EF于点G,连接BG,DE.(1)∠ACB与∠GCD有怎样的数量关系?请说明理由;(2)求证:△BCG≌△DCE.(1)解:∠ACB=∠GCD.理由如下:∵AB=AC,∴∠ABC=∠ACB∵CG∥AB,∴∠ABC=∠GCD,∴∠ACB=∠GCD.(2)证明:∵四边形CDFE是平行四边形,∴EF∥CD.∴∠ACB=∠GEC,∠EGC=∠GCD.∵∠ACB=∠GCD,∴∠GEC=∠EGC,∴EC=GC,∵∠GCD=∠ACB,∴∠GCB=∠ECD.在△BCG和△DCE中∴△BCG≌△DCE.9.已知命题:如图,点A,D,B,E在同一条直线上,且AD=BE,∠A=∠FDE,则△ABC≌△DEF.判断这个命题是真命题还是假命题,如果是真命题,请给出证明;如果是假命题,请添加一个适当条件使它成为真命题,并加以证明.解:是假命题.以下任一方法均可:①添加条件:AC=DF.证明:∵AD=BE,∴AD+BD=BE+BD,即AB=DE.在△ABC和△DEF中,AB=DE,∠A=∠FDE,AC=DF,∴△ABC≌△DEF(SAS);②添加条件:∠CBA=∠E.证明:∵AD=BE,∴AD+BD=BE+BD,即AB=DE.在△ABC和△DEF中,∠A=∠FDE,AB=DE,∠CBA=∠E,∴△ABC≌△DEF(ASA);③添加条件:∠C=∠F.证明:∵AD=BE,∴AD+BD=BE+BD,即AB=DE.在△ABC和△DEF中,∠A=∠FDE,∠C=∠F,AB=DE,∴△ABC≌△DE F(AAS).10.如图,AB=AC,AD⊥BC于点D,AD=AE,AB平分∠DAE交DE于点F,请你写出图中三对全等三角形,并选取其中一对加以证明.解:(1)△ADB≌△ADC、△ABD≌△ABE、△AFD≌△AFE、△BFD≌△BFE、△ABE≌△ACD (写出其中的三对即可).(2)以△ADB≌△ADC为例证明.证明:∵AD⊥BC,∴∠ADB=∠ADC=90°.∵在Rt△ADB和Rt△ADC中,,∴Rt△ADB≌Rt△ADC(HL).12.如图,AB∥CD.(1)用直尺和圆规作∠C的平分线CP,CP交AB于点E(保留作图痕迹,不写作法).(2)在(1)中作出的线段CE上取一点F,连接AF.要使△ACF≌△AEF,还需要添加一个什么条件?请你写出这个条件(只要给出一种情况即可;图中不再增加字母和线段;不要求证明).解:(1)作图如下;(2)取点F和画AF正确(如图);添加的条件可以是:添加AF⊥CE,可根据AAS判定△ACF≌△AEF;添加∠CAF=∠EAF,可根据AAS判定△ACF≌△AEF等.(选一个即可)13.如图,点C、E、B、F在同一直线上,AC∥DF,AC=DF,BC=EF,△ABC 与△DEF全等吗?证明你的结论.解:△ABC与△DEF全等.证明:∵AC∥DF,∴∠C=∠F.在△ABC与△DEF中,,∴△ABC≌△DEF(SAS).14.如图所示,在平行四边形ABCD中,AE⊥BD,FC⊥BD,垂足分别为E,F.(1)写出图中所有的全等三角形;(2)选择(1)中的任意一对全等三角形进行证明.解:(1)①△ABD≌△CDB②△ABE≌△CDF③△AED≌△CFB;(2)①证明:∵四边形ABCD是平行四边形,∴AB=CD,AD=CB,∵BD=DB,∴△ABD≌△CDB.②证明:∵AE⊥BD,CF⊥BD,∴∠AEB=∠CFD=90°.∵ABCD是平行四边形,∴AB∥CD且AB=CD.∴∠ABE=∠CDF.∴△ABE≌△CDF.③证明:∵AE⊥BD,CF⊥BD,∴∠AED=∠CFB=90°.∵ABCD是平行四边形,∴AD∥CB且AD=CB.∴∠ADE=∠CBF.∴△AED≌△CFB.15.如图,在△ABC中,AB=AC,点D、E分别是AB、AC的中点,点F是BE、CD的交点.请写出图中两组全等的三角形,并选出其中一组加以证明.(要求:写出证明过程中的重要依据)解:△ABE≌△ACD,∠FAE=∠EAD或△BFD≌△CFE(写出两个即可)(1)选△ABE≌△ACD.证明:∵点D,E分别是AB,AC的中点,∴.又∵AB=AC,∴AD=AE.在△ABE和△ACD中,,∴△ABE≌△ACD(SAS).(2)选△BCD≌△CBE.证明:∵AB=AC,∴∠ABC=∠ACB(等边对等角).∵点D,E分别是AB,AC的中点,∴,.∴BD=CE.在△BCD和△CBE中,,∴△BCD≌△CBE(SAS).(3)选△BFD≌△CFE.方法一:证明:∵点D,E分别是AB,AC的中点,∴,又∵AB=AC,∴AD=AE在△ABE和△ACD中,,∴△ABE≌△ACD(SAS),∴∠ABE=∠ACD,∵点D,E分别是AB,AC的中点,∴,,∵AB=AC,∴BD=CE,在△BFD和△CFE中,,∴△BFD≌△CFE(AAS).方法二:证明:∵AB=AC,∴∠ABC=∠ACB(等边对等角).∵点D,E分别是AB,AC的中点,∴,.∴BD=CE.在△BCD和△CBE中,,∴△BCD≌△CBE(SAS).∴∠BDC=∠CEB.在△BFD和△CFE中,,∴△BFD≌△CFE(AAS).16.已知,如图,延长△ABC的各边,使得BF=AC,AE=CD=AB,顺次连接D,E,F,得到△DEF为等边三角形.求证:(1)△AEF≌△CDE;(2)△ABC为等边三角形.证明:(1)∵BF=AC,AB=AE(已知)∴FA=EC(等量加等量和相等).∵△DEF是等边三角形(已知),∴EF=DE(等边三角形的性质).又∵AE=CD(已知)∴△AEF≌△CDE(SSS).(2)由△AEF≌△CDE,得∠FEA=∠EDC(对应角相等),∵∠BCA=∠EDC+∠DEC=∠FEA+∠DEC=∠DEF,△DEF是等边三角形,∴∠DEF=60°,∴∠BCA=60°,由△AEF≌△CDE,得∠EFA=∠DEC,∵∠DEC+∠FEC=60°,∴∠EFA+∠FEC=60°,又∠B AC是△AEF的外角,∴∠BAC=∠EFA+∠FEC=60°,∴△ABC中,AB=BC.∴△ABC是等边三角形.17.复习“全等三角形”的知识时,老师布置了一道作业题:“如图①,已知,在△ABC中,AB=AC,P是△ABC中内任意一点,将AP绕点A顺时针旋转至AQ,使∠QAP=∠BAC,连结BQ、CP则BQ=CP.”小亮是个爱动脑筋的同学,他通过对图①的分析,证明了△ABQ≌△ACP,从而证得BQ=CP.之后,他将点P移到等腰三角形ABC外,原题中其它条件不变,发现“BQ=CP”仍然成立,请你就图②给出证明.证明:∵∠QAP=∠BAC∴∠QAP+∠PAB=∠PAB+∠BAC即∠QAB=∠PAC在△ABQ和△ACP中,,∴△ABQ≌△ACP(SAS),∴BQ=CP.18.如图,△ABC中,AB=AC,过点A作GE∥BC,角平分线BD、CF相交于点H,它们的延长线分别交GE于点E、G.试在图中找出3对全等三角形,并对其中一对全等三角形给出证明.解:△BCF≌△CBD.△BHF≌△CHD.△BDA≌△CFA.证明:在△BCF与△CBD中,∵AB=AC.∴∠ABC=∠ACB∵BD、CF是角平分线.∴∠BCF=∠ACB,∠CBD=∠ABC.∴∠BCF=∠CBD,∴,∴△BCF≌△CBD(ASA).19.如图,在△ABC中,点D在AB上,点E在BC上,BD=BE.(1)请你再添加一个条件,使得△BEA≌△BDC,并给出证明.你添加的条件是_______.(2)根据你添加的条件,再写出图中的一对全等三角形_______.(只要求写出一对全等三角形,不再添加其他线段,不再标注或使用其他字母,不必写出证明过程)解:添加条件例举:BA=BC;∠AEB=∠CDB;∠BAC=∠BCA;证明例举(以添加条件∠AEB=∠CDB为例):∵∠AEB=∠CDB,BE=BD,∠B=∠B,∴△BEA≌△BDC.另一对全等三角形是:△ADF≌△CEF或△AEC≌△CDA.20.已知:如图,AB=AC,点D是BC的中点,AB平分∠DAE,AE⊥BE,垂足为E.求证:AD=AE.证明:∵AB=AC,点D是BC的中点,∴∠ADB=90°,。

三年级下学期英语专项练习题附答案详解(实用)

三年级下学期英语专项练习题附答案详解(实用)

一、选择题(每题 2 分,共20 分)1.t’s time ______ dinner. ( )A. forB. toC. of2.—Hi, Mike! Who’s that _________? ( )—She is my grandma.A. manB. womanC. panda3.( )A. sweater B. coat C. floor4.—What are ________? ( )—They’re oranges.A. theseB. thisC. that5.How many ________ do you see? ( )A. birdB. kitesC. ball6.( )A. eighteen B. twenty C. snowy7.y mother’s mother is my _________. ( )A. motherB. grandpaC. grandma8.( )A. cap B. fat C. big9.—How many bananas are there? ( )—______A. Twelve.B. Eleven.C. Thirteen.10.Who is that woman? ( )—She’s my ______.A. grandpaB. grandmaC. uncle二、判断题(每题 3 分,共15 分)11.判断对话与图片是(T)否(F)相符:—Is the monkey on the box? —No, it isn’t.It’s in the box. ()12.判断英文表达与图片内容是(T)否(F)相符:This is a school.()13.判断句子与图片是(T)否(F)相符:There is a blackboard in the classroom.()14.判断下列英文情景是否相符:当你和好朋友道别时,你可以说:Goodbye. ()15.判断英文表达与图片内容是(T)否(F)相符:Kevin is tall. ()三、填空题(每题 2 分,共20 分)16.Don’t . My mother is sleeping.17.It’s hot. Please ______ (close / open) the window.18.Here is a pen ______ (at / for) you.19.—Are these boys twin brothers?—Yes, are.20.—This doll is for you.—______ nice!21.—Nice to meet you.—Nice to meet you, ______ (too / to).22.—Is he Mr Jones?—No, he ________ (is; isn’t).23.—Is she your friend?—________ (Yes; No), she is.24.It’s warm today, but it’s .25.They are .四、情景交际(每题 5 分,共20 分)26.—Dad, I’m hungry. ( )—_______A. Have some rice.B. Have some juice.27.叔叔因为工作原因常常去西安,你想知道他选择什么交通工具去,便问叔叔:( )A. What’s in Xi’an?B. How do you go to Xi’ an?C. Do you go to Xi’ an in the afternoon?28.当看到别人要摔跤时,应说:( )A. Watch TV.B. Watch out.C. Look at me.29.当你想知道Sam早上做什么,你会问:______ ( )A. What do you do in the morning?B. What do you do in the afternoon?五、连词成句(每题10 分,共10 分)30.us, home, go, Let (!)____________________________六、选出每组单词画线部分发音不同的一项(每题 5 分,共15 分)31.( )A. like B. big C. six32.( )A. up B. student C. fun33.( )A. OK B. dog C. orange参考答案一、选择题1.【解析】【详解】句意:该吃晚餐了。

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专项练习三选择填空1.—_____your name, please?—My name is Tom Smith.A. WhatB. What’sC. HowD.How’s2.He is_______.A. John BrownB. Brown JohnC. Gina GreenD. Green Gina3.She is Alice Johnson. ______ phone number?'is 254-6809.A. HisB. YourC. HerD.My4. I_____ Linda Green. My last name____ Green.A. am; am B . is; is C.is; am D.am; is5. —Is this an orange?—Yes,_______ .6.They_____ Tom’s parents.A. isB. aren’tC.isn’tD.be7.Your mother is your cousin’s ______.A. brotherB.auntC.auntD. son8.—____is she?—She ___ my sister.A. Who; isB. Who; areC.What; isD. What ;are9. ______the next picture _____my brothers, Bob and Eric.A. Are; inB.In; areC. On; isD.On are10. —What's her last name?—_______.A.JennyB. LindaC.EricD.Brown11. -What’s your last name?-____Brown.A.It isB.ItC.ItsD.I’m12. —Are you Ms. White?—Yes,________.A. I’mB. I amC. amD.I’m not13. —What’s six and three?—It’s _____.A. eightB. sevenC. fiveD.nine14. Jack is a_____and ______ phone number is 281-3245.A.boy; hisB. boy; heC.girl; herD.girl; his 15. An English name is made up of (由……组成)first name,middle name and_________.A.secondB. given namest nameD. father’s name16. —How do you spell “eraser”?—_________.A. It’s my eraser.B.No,it isn’t.C.Yes. E-R-A-S-E-RD.E-R-A-S-E-R17. —Is this her pencil?—_______.A. No, it’s my pencilB. No, it’s a pencilC. Yes, it’s, mypencil D. No, it’s a pen18. This is______eraser and that is______ring.A. a; anB. an; anC.an; anD.a; a19. —Is your first name Sally?—___________.A. Yes, isB. Yes, it’s.C.No, it isn’t.D. No, I’m not.20. What’s “直尺”_________ ?A. in EnglishB. in ChineseC.is itD.it’s21. Is this________ pencil box?A. IB. heC. sheD. your22. Six two five one nine double zero is Brown’s telephonenumber. In his number we can see____”0”(s).A. 1B.2C.3D. 423. This is a bird. ____ name is Polly.A. It’sB.He’sC.She’sD.Its24. —This is your book.—_________.A. Thank youB. ThankC. ThanksD. Thank your25. —Is this ______book?—Yes, it’s______English book.A. a; aB. a; anC. an; anD.an; a26. —What’s this?—______.A. Yes, it isB. It’s mapC. It’s a mapD.This is a map.27. Is that______ruler?A. heB. himC. sheD. her28. Is his pencil box______the desk?A. inB. atC. forD. of29. ______the cups on the table?A.AmB. IsC. AreD. Do30. This is a picture______our family.A. ofB. on c. in D. at31. ______sofa is______the floorA. An; onB. A; underC. The; underD. The; on32. —____ are your friends?—They are____the classroom.A. Where; onB. How; inC.Where; inD.Who; in33. — Are the pens in the pencil box?—No,_______.A. it isn’tB. it isC. they areD. they aren’t34. ____is on ____chair?A. What; theB. What; aC. Where; theD.Where; a35. —Come on, Lily!—________.A. Fine, thanks.B. Excuse meC.OKD. Goodmorning.36. The table is_____ the floor and the bag is_____the chair.A. on; underB. in; onC. under; inD.in; behind37. I ask for some_______.A. English booksB. English bookC.thingD. pencil box38. My picture is_____the wall and the window is____thewall.A. on; onB. on; inC.in; inD.in; on39. —Are the pencils on the desk?—Yes,_________. |A. they’re notB. they’reC. they areD.it is40. _______new model plane is on _______ desk.A. A;anB. A;aC. An; theD. The; the41. —I can’t find my eraser.Where’s it, Dad?—I_____ it’s in your pencil box.A. thinkB. helpC. askD. thank42. Linda’s room is very clean, ______her brother’s is not.A. andB.butC. orD. at43. —Who _____ 20 yuan?—I have.A. haveB. hasC.do haveD.is have44. This is_______interesting book and I like it very much.A. aB. anC. theD. /53.—Let’s play soccer.— No,it’s _____.I want to watch TV.A. interestingB. relaxingC. excitingD. boring54.Bob often helps_____at school. ______must thank him.A. we; WeB. we; Us; UsD. us; We55. Peter has a baseball, _____he can’t play it well.A.andB. butC. orD. so56. —________does the little boy have______lunch? —Apples.A. What; /B. How; /C. What; forD. When; for57. They often______dinner, at 7:00 in the evening.A. hasB. haveC. have aD. eats58.I like____and ______.A. tomatos; riceB.tomatoes; ricesC. tomatoes; riceD.tomato ; rices59.—Do you like ice-cream, Sally?—Yes, _______I don’t eat it. I don’t want to be fat.A. andB.soC.butD. or60.—Can I ask you a _______?—Sure. I’m glad to answer it.A.questionB. helpC. numberD.clock61. —l like hamburgers for breakfast, ________you?—I like rice and vegetables for it.A. What doB. Do you likeC. What aboutD.Does62. —What does Jenny have ______ breakfast?—She has some bread and a glass__ milk. A. for; of B. of; for C. for; for D.at; of63. The boy has ________for supper every day.A.chickensB. chickenC.ice-creamsD. banana64. Sam_______ like baseball______tennis.A.don’t ;orB. don’t ; andC. doesn’t; orD. doesn’t and65. —Do Jim and Sam like milk?—_________.A. Yes, he doesB. No, he doesn’tC.No, they don’tD.Yes, they are66. —Let’s have apples.—_________.A. That sound goodB. That’s sound goodC. That’s soundsgood D. That sounds good67. This is a_______shop.It sells bananas, apples, pears andoranges.A. vegetableB. foodC. fruitD. drink68. Let’s_____and______lunch now.A. to go; to haveB. to go; haveC. go; to haveD.go; have69. Kate likes some eggs_______her breakfast. She is veryhealthy.A. toB.atC. forD. under70. ______your sister_____carrots?A. Do; eatB.Is; eatC. Does; eatD. A re; eat71. The shoes in____brown and yellow are $16.A. aB. anC.theD. 772. Do you need shoes __ sports?A. toB. atC. inD. for73. —_______is it?—It’s orange.A. WhatB. What colorC. How muchD. How many ,74. You want it, and we have it____a very good price.A. forB. atC. ofD. in75. How much ____these jackets?A. areB. isC.amD. be76. How much ______do you want?A. tomatoesB. bananasC. hamburgersD. chicken77. —What can I do for you?—_________. 1A. Thank you.B.Yes, please; I want a pen.C. You’rewelcome. D.I’m sorry.78. —________the shorts?—They’re 20 yuan.A. How much isB. How much areC. How many isD.How many are79. —Where____your new trousers?—_______on the bed.A. is; It’sB. are; They are c. is; They’re D. are; It’s80. —The T-shirt is only ten dollars.—I’ll_______ it.A. haveB. take c. sale D. sell81. —Please give me some bread.—OK. _________.A. Here you areB. Give youC. Yes, thanksD. You arehere82. We have_______students.A. fourty-fourB. four fourtyC.forty-forD. four-forty83. —Thank you for your help.—_________.A.That’s right Your’re right C. You’re welcome D.Don’tthank me84. —Your skirt is very nice.—____________A. Oh, no.B. Where?C. Thank you.D.Don’t say it.85. —Can I help you?—Yes, I want_______for my mother.A. two pair of shoesB. two pair of shoeC.two pairs ofshoes D. two pairs of shoe86. —__________?—It is on June 1st.A. Where is your brotherB.What is your nameC. When isyour birthday D.What is your birthday87. —How old are you?—____________.A. He is twelveB.It is on October 13C. I am nineD. It’s two o’clock88. —Do you play football every afternoon?—_________.A. Yes, I doB. No, I like itC.Thank youD. Sorry89.________is the ninth month of a year.A. AugustB.SeptemberC.OctoberD. November90. —________?—He is twenty.A. What’s your grandmother’s ageB. How old is your brotherC. What’s your sister’s ageD.When is your sister’s birthday91—Today is my birthday.—______________A. Happy New Year!B. Thank you very much.C. How are you.D. Happy birthday!93. —______is the Sports Day?—It’s great,A. WhenB. HowC. WhatD. Where94. —How many months are there in a year?—______.A. TenB.Nine c. Seven D.Twelve95, His_____ birthday is on November 17th.A. fathersB. fathers’C.fatherD. father’s96. ____ October and May, many______have a trip.A. In; boyB. On; boysC. In; girlsD. On ;girls97. We have______art festival______our school every year.A. a; atB. an; inC. /; at98. _______your father have a birthday party every year?A. DoB. AreC. DoesD. Is99. This is________mother.A.Lucy and LilyB.Lucy’s and Lily’sC. L ucy and Lily’sD. Lucy’s and Lily100. ______ Day is on June 1st and _____ Day is on September 10th.A. Children’s; Teacher’sB. Children’s; Teachers’C. Childrens’; Teacher’sD.Childrens’; Teachers’101. —______does he like science? —Because it’s inte resting.A. WhatB. WhyC. WhenD.Where102. —What’s Tom’s favorite sport?—______favorite sport is soccer.A. ItsB. It’sC. HisD. He103. —________does your music teacher come?—At nine o’clock.A. WhenB. WhatC. WhoD. Why104. I don’t like math_____it’s difficult for me.A. butB. andC. orD. because105. —_________does he have P. E. ?—He has P. E. at 3 :00 in the afternoon.A. WhenB. WhatC. WhereD.Why106. We have history____Tuesday.A. onB. inC.atD./106. —What does he like?—He_____vegetables.A. likesB.likeC. is likeD. to like107. —Do you like music and art?—____________.A. Yes, it doesB. No, it isn’tC.Yes, because they’rerelaxingD. No, I do108. Let me________the new student to the classroom.A. takeB. takesC. to takeD. taking109. Can you play________?A .basketball B. the football C. a football D. a basketball110. It’s Friday,__________.A. november 15B. november 15thC. the 15th NovemberD. November 15th111. ______Smith is my nice art teacher. He is great fun.A. Mr.B. Mrs.C. MissD. Ms112. For me, science is difficult______interesting.A. soB. andC. butD. or113.—________is it today? ,—It’s Wednesday.A. What timeB. What dayC. What aboutD. Whatdate114. I think art is_______interesting subject.A. aB. anC. theD. /。

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