江苏省常熟市2018_2019学年八年级英语上学期期末质量监测卷

南京地区八年级学期期末英语试卷分类汇编单项选择江浦二中16. Kitty is such ________ honest student that she is often praised by her teachers.A. aB. anC. theD. /17. --- Did Mrs. White buy a skirt last week?--- Sure. She bought ________ one of the two white skirts.A. less expensiveB. the least expensiveC. the less expensiveD. the most expensive18. Ladies and gentlemen, whether young or old, ________ some money of yours to the poorpeople in mountain areas.A. to donateB. donatingC. donateD. will donate19. --- I didn’t sleep well last night and feel quite sleepy now.--- Why not stop ________?A. to workB. to have a restC. having a restD. to go on with your work20. You’d better ________ quiet about this problem.A. not keepB. not to keepC. not keepingD. not kept21. She seems ________ than all of us ________ for the coming Christmas.A. busier; to prepareB. much busier; preparingC. busy; to prepareD. more busier; preparing22. --- I’m new here. I don’t know how to solve the problem.--- Don’t worry. I’ll do what I can ________ you.A. helpB. helpingC. to helpD. to helping23. The engineers ________ a new computer in our classroom the whole yesterday morning, sowe had our classes in the school hall.A. were fixingB. fixedC. have fixedD. are fixing24. The sentence structure of “The food tastes better than I cooked last week.” is ________.A. S+V+OB. S+VC. S+V+DO+OCD. S+V+P25. Our physics teacher has broken his legs. So our headmaster ________ will teach us in the nexttwo weeks.A. hisB. heC. himD. himself26. --- Tom, what were your parents doing at 8:00 last night?--- My mother was reading ________ my father was playing computer games.A. whileB. whenC. unlessD. as long as27. --- Do you have any plans for this Sunday?--- I’m not sure. I ________ go to the countryside to see my grandmother.A. canB. mustC. mayD. need28. I got up very early this morning ________ late for watching the sun-rise.A. in order to beB. in order to be notC. not in order to beD. in order not to be29. The policemen worked very hard to keep the international meeting ________.A. safeB. safelyC. safetyD. save30. --- What about going to Shanghai Disneyland Park next month, Harry?--- ________. We’ll have a lot of fun there.A. Good luckB. Never mindC. Sounds greatD. Certainly not16. B 17. C 18. C 19. B 20. A 21. B 22. C 23. A 24. D 25. D 26. A 27. C 28. D 29. A 30. C郑和外国语学校16. I found a report _______ animals _______ yesterday’s newspaper.A. in; inB. on; inC. about; onD. on; on17. — What is your mother doing now?— She _______ sleeping because she worked too late last night.A. may beB. maybeC. may isD. may18. The temperature will be _______ tomorrow. It will _______ to -5ºC.A. colder; fallB. less; fallC. higher; coverD. lower; drop19. Nowadays, advertisements are like air. You can see them _______.A. nowhereB. everythingC. everywhereD. somewhere20. The sentence structure of “Teachers ask us to finish the homework on time.” is _______.A. S+V+DOB. S+V+IO+DOC. S+V+DO+OCD. S+V+P21. ——Look, there is a lot of waste in the river.——Yes, it’s said that 80 per cent of fish in this river _______ live long.A. doesn’tB. don’tC. isn’tD. aren’t22. _______ wonderful time to watch the birds in the wild on the coming holiday!A. HowB. How aC. What aD. What23. --- Why did you come home so late today?--- Because it _______ heavily when we finished the work. We had to wait until it stopped.A. was rainingB. is rainingC. rainedD. rains24. Today the forests are in danger. We must take action to _______ down too many trees.A. prevent people cuttingB. keep people from cuttingC. stop people cuttingD. all the above25. The number of giant pandas is becoming _______, because there are _______ living areas forwildlife.A. fewer and fewer; less and lessB. smaller and smaller; less and lessC. fewer and fewer; smaller and smallerD. smaller and smaller; fewer and fewer26. _______ more accidents, you’d better _______ the driving speed while dr iving.A. Stopped; to slow downB. Stop; to slow downC. To stop; slow downD. Stopping; slow down27. The giant panda weighs just _______ when it is _______.A. 10 kilogram; 10 month oldB. 10-kilograms; 10-month-oldC. 10-kilogram; 10 months oldD. 10 kilograms; 10 months old28. Sometimes walking is much _______ than driving during the busy traffic time.A. fastB. fasterC. slowD. slower29. --- Hello, Jim. _______ do members of the Birdwatching Society visit Qinghu every year? --- Once a year, usually in spring.A. How many timesB. How longC. How soonD. How often30. --- My mother says that we won’t go on a trip to Malaysia because it is too dangerous.--- _______. You were looking forward to it.A. Never mind.B. Don’t worry about it.C. Enjoy yourselves.D. What a pity.16-20 BADCC 21-25 BCADD 26-30 CDBAD溧水区16. If you want to be _____ useful person in the future. You should read more.A. aB./C. anD.the17. M y family and I had a (an) ______ trip in Taiwan because of the typhoon and rainstorm.A. perfectB. unpleasantC. comfortableD. impatient18.---Why are you driving so slowly, Dad?---It's so ______ and I can't see the road clearly.A. cloudyB. sunnyC. windyD. foggy19.---Somebody knocked at the door just now.---Sorry, I didn't hear it. I______ to the music at that time.A. listenedB. am listeningC. was listeningD. listen20.--- I missed the beginning of The V oice of China IV yesterday evening.--- ! But you can watch the re-play tonight.A．Hurry up B. What a pity C. Try your best D. I don’ t think so21.Zhang Liangying is so popular among young people ________ her beautiful voice.A. becauseB. because ofC. insteadD. instead of22. Suzy was making a snowman _______ Kitty was standing beside her.A. whenB. andC. untilD. while23. The floor is quite wet, and my teacher told us_______ quickly.A. to mop up itB. mopped it upC. to mop it upD. mop it24. There are ________ bears on the earth because they have ________ space on it.A. fewer and fewer; less and lessB. more and more; fewer and fewerC. less and less; fewer and fewerD. more and more; less and less25. ---Did you sleep well yesterday? You look very tired !---My mother made me _______ the piano for a whole night.A. play B．played C．to play D．plays26. The reserve gives wildlife food and cover. Which is the correct sentence structure?A. S+V+PB. S+V+IO+DOC. S+V+DO+OCD. S+V+DO27. Vivien worked very hard at all her lessons. __________, she became the top student in her class.A. In order toB. As a resultC. As usualD. For example28.--- What shall we do now?---__________ it’s raining hard, let’s stay at home.A. SoB. SinceC. HoweverD. Otherwise29. ---__________ weather it is! We can’t go boating on the Shijiu Lake.---Don’t worry. Let’s go to the Science Museum instead.A. What goodB. How goodC. How badD. What bad30.---My uncle fell off the bike and hurt his legs yesterday.--- _______.A．I am sorry to hear that B．He is too carelessC．That's too bad D．He should be careful单项选择16-20 ABDCB 21-25 BDCAA 26-30 BBBDA南京二中16. In the sentence “Every morning, I hear the birds sing in the park”, the underlined part is _____.A. PB. OCC. IOD. DO17. —_____ do you know about wild elephants, Andy?—Well, only a little. I know most of them live in Asia and Africa.A. How muchB. How manyC. How oldD. How heavy18. The old man told the tourists _____ the birds in the zoo any more.A. don’t feedB. didn’t feedC. not feedD. not to feed19. Wang Feng is so popular among thousands of people _____ his unique (独特的) voice.A. becauseB. because ofC. insteadD. instead of20. In North-east China, the temperature is usually_____ -20℃ in winter.A. underB. overC. belowD. above21. It’s very dangerous for drivers to have a long drive at night. They may feel _____.A. sleepyB. excitedC. excitingD. nervous22. —Daniel, do you remember the earthquake in Xinjiang last month?—Yes, a lot of houses and buildings _____ during the disaster.A. fell againstB. fell downC. fell offD. fell over23. —You don’t have to take a raincoat. It won’t rain.—Well, I am not sure. It _____ rain from time to time.A. mayB. mustC. shouldD. need24. A terrible _____ hit the village. It washed away lots of houses.A. snowstormB. fogC. floodD. earthquake25. Finally, the two volunteers _____ a plan and helped the trapped deer out of danger.A. looked outB. worked outC. got outD. took out26. — I saw Kitty in Nanjing Hongshan Zoo last Saturday afternoon.— What? But she _____ playing the piano with me in the music hall at that time.A.practisesB. practisedC. is practisingD. was practising27. Planting more trees _____ it _____ for people to protect more wildlife.A. make; possibleB. makes; possibleC. make; impossibleD. makes; impossible28. It’s reported that the number of wild tigers _____ year by year.A. is becoming fewer and fewerB. is becoming smaller and smallerC. are becoming fewer and fewerD. are becoming smaller and smaller29. —The radio says tomorrow will be rainy.—_____. Our class plans a trip to Lishui tomorrow.A.I am afraid soB. I don’t mindC. I hope notD. I don’t think so30. —___________ more about tomorrow’s weather, call 121.— OK, I will. Thank you.A. KnowB. KnowingC. To knowD. Knew16-20 BADBC 21-25 ABACB 26-30 DBBCC栖霞区南外仙林分校21.Tim is _______ excellent runner, he often gets _______ first prize in the race.A.An, theB. The, theC. A, /D.an, /22.There were _______ teachers and students sitting at our school’s p layground to watch the performance of the new year’s celebration.A. Two thousand ofB. Two thousandC. Thousand ofD. Two thousands of23.-Have you decided what _______ for the coming winter holiday?-Yes, I plan _______ my parents in Henan.A.to do, visitB. to do, to visitC. doing, to visitD. doing, visit24.If the temperature drops below 0℃, water will be _______.A. freezingB. freezeC. frozenD. froze25. The number of the giant pandas is becoming fewer and fewer. If we do _______ to protect them, there will be _______ left.A. anything, no oneB. nothing, noneC.something, nobodyD. nothing, no one26.Every year in autumn, we can see very beautiful maple leaves on _______ sides of Xianlin Avenue. Lots of people like to take photos there.A. eachB. allC. eitherD. both27.Billy is a top student in English learning. She studies English by _______ it every day.A. practicingB. practiceC. to practiceD. to practicingputers entered the Chinese market _______ and have been popular since then.A. in the 1990B. in the 1990sC.in 1990sD. in the year 1990s29.My mother _______ me to the zoo if she _______ free tomorrow.A. will take, will beB. takes, isC. will take, isD. takes, will be30.What is the correct structure of the sentence “Driving brings the young man happiness?”A. S+V+IO+DOB. S+V+DOC. S+V+DO+OCD.S+V+P31.The little boy was blind _______ birth. We should have pity _______ him.A. at, forB. at, onC. for, onD. at, at32. Tim cook called his mother every week even while he _______ around the world.A.was travelingB. is travelingC. traveledD. travels33. -I think cycling isn’t as exciting as climbing.-That’s because you can’t ride well. _______, both of them are interesting.A.In the beginningB. In factC. As a resultD. At last34. _______ will the weather be like tomorrow？-I hope it will be _______. There are many wet clothes at home.A.What, cloudyB. How, snowyC. What, sunnyD. How, fine35.-Would you like to attend china’s got talent?- _______, but I’m busy preparing for my test.A.Thanks a lotB. I’d love toC. That’s all rightD. Never mindB.ABBCB DABCA BABCB秦淮区钟英中学16.-- What a heavy rain it was last night!-- Yes, but I love air after the rain. It smells so fresh.A. aB. theC. anD. /17. We should do talking and some more work. Actions speak louder than words.’A. lessB. muchC. moreD. little18.If Mary free tomorrow, I will ask Tom instead.A. doesn’tB. won’t beC. isD. isn’t19.In winter, people usually keep flowers in their house to them the cold of weather.A. provideB. provide C, protect D. plant20.-- What do you think of Max?-- He is funny and often makes us .A. laughB. to laughC. laughedD. laughing21.Practicing more can make easier for us to get good results in the race.A. thatB. itC. thisD. those22.It’s foggy now. You should drive the car as as possible.A. carefulB. more carefulC. carefullyD. more carefully23.You had better ask the children with water in the garden.A. not to playB. to playC. not playD. don’t play24.The sentence structure of “They are swimming” isA. S+VB. S+V+PC. S+V+OD. S+V+DO+OC25.Tom was washing the dishes in the kitchen Jack was watching TV in the room.A. ifB. whetherC. asD. while26.She didn’t know to do when the boy was ill.A. whereB. whichC. whatD. how27.You can call me 78653487 or email me happy@.A. in; onB. on; atC. on; onD. at; at28.Vivien worked very hard at all her lessons. , she become the top students in her class.A. In order toB. As a resultC. As usualD. For example29.-- What a terrible flood!-- Yes. We must try to prevent the flood the fish in the river.A. to saveB. saveC. of savingD. from saving30.-- It’s reported that three firemen lost their lives in the big fire.-- .A. Not at allB. I’m afraidC. I’m sorry to hear thatD. It doesn’t matter.16-20 BADCA 21-25 BCABD 26-30 CBBAC秦淮中学16. I saw one-eyed cat on grass just now.A. an; theB. a; theC. an; aD. a; a17. An old friend of my father's always helps both my sister and_____ with _____ English.A. I; myB. I; ourC. me; ourD. me; us18. —May I have some coffee, Mum?—No, you ________. It’s not good for your sleep.A. couldn’tB. needn’tC. won’tD. should n’t19.“What should I do next?” I thought hard. Suddenl y, a good idea went ______my mind.A. overB. acrossC. aboutD. through20. —can I take all these tools home?—You have got a car, right?A. HowB. WhereC. WhyD. What21. Wild animals have _______ living areas. As a result, their numbers are getting _________.A. less and less; larger and largerB. fewer and fewer; more and moreC. less and less; smaller and smallerD. fewer and fewer; smaller and smaller22. The big trees __________ some shade __________ us.A. provided; forB. provided; withC. offered; forD. offered; with23. We need __________ at the hotel for __________ because of the heavy snow.A. stay; short stayB. staying; a short stayC. to stay; short stayD. to stay; a short stay24. — Do you know why he left so early?—_______for the English test, I guess.A. StudyB. StudiedC. To studyD. Studying25. The sentence structure of ‘We called her Xiwang.’ is________．A. S+V+ IO +DOB. S+V+DO+OCC. S+V+PD. S+V+DO26. When I walked past the teacher’s home, she ________ the next day’s lesson.A. is getting ready forB. gets ready forC. was getting ready forD. got ready for27. The box is _____ heavy for the girl ____ carry.A. too; toB. enough; toC. so; thatD. such; that28. —What do you know about Steve Jobs?—He was _______ an amazing leader _______ the father of the computer. He died on October 5th.A. not ; butB. neither ;norC. not only; but alsoD. either; or29. I'll let you know as soon as he _________.A. will come backB. comes backC. is coming backD. come back30. —You must be very excited about going to New York for further study.—__________, but I am afraid I won’t do well because my English is poor.A. I’m sorryB. Certainly notC. I don’t know yetD. Well, I should be16. B 17. C 18. D 19. D 20. A 21. D 22. A 23. D 24. C 25. B26. C 27. A 28. C 29. B 30. D。

2018—2019学年上期四校联盟期中检测八年级英语试题（考试时间：100分钟满分：150分）一. 听力测试。

（共30分）第一节：情景反应听一遍。

根据你所听到的句子，从A、B、C三个选项中选出最恰当的答语。

( ) 1.A.Once a week. B.Three . C. It’s boring ( ) 2. A.Tomorrow. B.sure C. It’s interesting( ) 3.A. play soccer B.many students. C.interesting.( ) 4.ANo problem. B.the red one . C.13 days.( ) 5.A.Yes, she does. B.coffee C.All of them.第二节：对话理解听二遍。

根据你所听到的对话和问题，从A、B、C三个选项中选出最恰当的答语。

( ) 6.A.Once a month. B.Twice a month. C.Three times a month.( ) 7. A.For a week. st week. C.Next week.( ) 8.A. To Guangzhou. B.To Hainan. C.To Dalian.( ) 9.A. Lisa B. Jenny. C..Cindy( ) 10.A.Yes, she does. B I don't know. C No, she doesn’t.第三节：短文理解。

听两遍。

根据你所听到的短文内容，从A、B、C三个选项中选出正确答案A( )11.How old is Mr Liu?A.17B.70C.60( ) 12.Where does Mr Liu exercise every day?A.In a park.B.At home.C.At school.( ) 13.What does Mr Liu sometimes play with his friends?A. GamesB. CardsC. Chess( ) 14. How often does Mr Liu go to the library?A. Three times a monthB. Twice a week.C. Twice a month.( ) 15. How long does Mr Liu watch TV every night?A For a week B. For half an hour C. For an hourB.( )16. When did Robert go fishing?A. On Friday.B. On Saturday.C. On Sunday.( )17. Whom did Robert go fishing with?A. Nick.B. Mike.C. Dick.( )18. How did the two boys get to the river?A. On foot.B. By bike.C. By bus.( )19. What time did it start to rain?A. At three in the afternoon.B. At about four in the afternoon.C. At five in the afternoon.( )20. Did they get wet in the rain?A. No. they didn't.B. Yes. they did.C. I don't know.二．单项选择。

无锡市锡山区2018年秋学期期末考试试卷初二英语2019.01注意事项：1. 本试卷分两部分。

考试时间为100分钟。

试卷满分为100分。

2. 所有答案必须写在答题卷各题目指定区域内相应的位置上。

答案写在试卷其它部分无效。

第I卷客观题（共65分）一、听力部分（本大题共20分，每小题1分）第一节（共10小题，每小题1分）听下面10 段短对话，每段对话后有一个小题，从题中A、B、C 三个选项中选出最佳选项。

听完每段对话后，你都有5秒钟的时间来回答有关小题和阅读下一小题。

每段对话读两遍。

听第1至10段材料，回答第1至10题。

1.What animal are they going to see next?A. B. C.2.What will the weather be like tomorrow?A. B. C.3.Where will the girl’s family go this winter holiday?A. B. C.4.What does Li Lei’s father do?A. B. C.5.What time will Mr. Wang leave for the theatre?A. At 6:45.B. At 7:00.C. At 7:15.6.Whose books are these?A. Kitty’s.B. Bruce’s.C. Mike’s.7.Why does the girl feel worried?A. Because she is not as clever as her friends.B. Because she is not as pretty as her friends.C. Because she is not as slim as her friends.8.Where is Peter now?A. In the playground.B. At home.C. In the classroom.9.What is Daniel’s favourite subject?A. English.B. Science.C. Maths.10.What does Jane mean?A. She liked the weather.B. She had a good time.C. She hated camping.第二节（共10小题，每小题1分）听下面3段长对话和短文，每段对话和短文后有几个小题，从题中A、B、C三个选项中选出最佳选项。

2018-2019学年江苏省苏州市常熟市八年级（上）期中数学试卷一、选择题本大题共10小题，每小题3分，共30分.在每小题给出的四个选项中，只有一项是符合题目要求的，请将正确选项前的字母代号填写在答题卷相对应的位置上.1．下列标志图中，是轴对称图形的是（）A．B．C．D．2．某人一天饮水1.9×103mL，这个数精确到（）A．0.1 mL B．1 mL C．10mL D．100 mL3．估计﹣1的值在（）A．1和2之间B．2和3之间C．3和4之间D．4和5之间4．下列说法正确的是（）A．无理数包括正无理数、负无理数和零B．实数都能用数轴上的点表示C．带根号的数都是无理数D．不带根号的数都是有理数5．小亮不小心打碎了一块玻璃，他根据所学的知识带了B部分去玻璃店配了一块完整玻璃，他的依据是（）A．ASA B．SAS C．AAS D．SSS6．已知P是△ABC内一点，连接P A，PB，PC，且P A＝PB＝PC，则P点一定是（）A．△ABC的三条中线的交点B．△ABC的三条内角平分线的交点C．△ABC的三条高的交点D．△ABC的三边的中垂线的交点7．在平面直角坐标系中，点P（2，1）向右平移3个单位得到点P1，点P1关于x轴的对称点是点P2，则点P2的坐标是（）A．（5，1）B．（5，﹣1）C．（﹣5，1）D．（﹣5，﹣1）8．2002年国际数学家大会在北京召开，大会选用了赵爽弦图作为会标的中心图案．如图，由四个全等的直角三角形与一个小正方形拼成一个大正方形．如果大正方形的面积是25，直角三角形较长的直角边长是a，较短的直角边长是b，且（a+b）2的值为49，那么小正方形的面积是（）A．2B．0.5C．13D．19．如图，将边长为2的等边三角形沿x轴正方向连续翻折2018次，依次得到点P1，P2，P3，…，P2018，则点P2018的坐标是（）A．B．C．D．10．如图，在长方形ABCD中，AB＝3，AD＝4，动点P满足S△PCD＝，则点P到A，B两点的距离之和P A+PB的最小值为（）A．4B．5C．7D．二、填空题本大题共8小题，每小题3分，共24分.把答案直接填在答题卷相对应位置上. 11．3的平方根是．12．在实数：﹣，，3.14，（）0，，﹣中，无理数有个．13．已知|a﹣5|+＝0，那么P（a，b）在第象限．14．已知三角形的三边长分别为8、15、17，则该三角形的面积为．15．已知等腰三角形ABC的周长是10厘米，AB＝4厘米，则BC＝厘米．16．如图，在Rt△ABC中，∠ACB＝90°，EF⊥AB于点D，交BC的延长线于点E．若AB＝EF且BE＝16，CF＝6，则AC＝．17．如图，在△ABC中，AB＝AC＝10cm，AD⊥BC于点D，DE⊥AB于点E，BF⊥AC于点F，DE＝3cm，则AF＝cm．18．如图，在△ABC中，AC＝BC，∠ACB＝120°，点D在线段AB上运动（D不与A，B 重合），连接CD，作∠CDE＝30°，DE交BC于点E．若△CDE是等腰三角形，则∠ADC 的度数是．三、解答题本大题共10小题，共76分.把解答过程写在答题卷相对应的位置上，解答时应写出必要的计算过程、推演步骤或文字说明.作图时用2B铅笔或黑色墨水签字笔. 19．（8分）求出下列x的值．（1）16x2﹣49＝0；（2）24（x﹣1）3+3＝0．20．（4分）++|3﹣|．21．（7分）若a，b互为倒数，c，d互为相反数，+x＝0，y是的整数部分，求代数式（ab+c+d）x+的值．22．（7分）已知：在Rt△ABC中，∠A＝90°．（1）利用圆规和直尺，在图中找一个点P，使点P到AB，AC的距离相等，且PB＝PC．（不写作法，保留作图痕迹）（2）若BC的垂直平分线交直线AB于点E，AC＝12，AE＝5求AB的长．23．（6分）在正方形网格中每个小正方形的边长都是1，每个小正方形的顶点叫做格点以格点为顶点，分别按下列要求画三角形．（1）在图①中，画一个面积为10的正方形；（2）在图②中，已知线段AB，以AB为一边画等腰三角形ABC，则顶点C共有个．24．（7分）如图，在△ABC中，AB＝AC，点D为AC上一点，且满足AD＝BD＝BC．点E 是AB的中点，连接ED并延长，交BC的延长线于点F，连接AF．（1）求∠BAC和∠ACB的度数；（2）求证：△ACF是等腰三角形．25．（7分）如图，在△ABC中，∠ACB＝90°，AC＝BC．D是AB的中点，且∠EDF＝90°，点E在AC上，点F在BC上．（1）求证：DE＝DF；（2）若AC＝BC＝2，求四边形ECFD的面积．26．（10分）如图①，在长方形OABC中，O为平面直角坐标系的原点，点A的坐标为（4，0），点C的坐标为（0，6），点B在第一象限．点P从原点出发，以每秒2个单位长度的速度沿着O﹣A﹣B﹣C﹣O的路线匀速移动（即：沿着长方形移动一周）．点P移动的时间为ts．（1）点B的坐标为；当t＝4s时，点P的坐标为．（2）在移动过程中，当点P到x轴的距离为5个单位长度时，求点P移动的时间．（3）如图②，若将长方形OABC沿着AC翻折，点B与点B'重合，边AB'与y轴交于点E，求出点E的坐标．27．（10分）如图，在△ABC中，AB＝AC，∠BAC＝90°，点D，E分别在AB，BC上，且∠EAD＝∠EDA．延长DE，交AC的延长线于点F．（1）求证：DE＝EF；（2）判断线段BD和CF的数量关系，并说明理由；（3）若AB＝AC＝3，CF＝1，求BE的长．28．（10分）如图1，在平面直角坐标系中，点O为坐标原点，点A的坐标是（0，8），点B的坐标是（6，0），连接AB．若动点P从点O开始，按O﹣A﹣B﹣O的路径匀速运动，且速度为每秒1个单位长度，设运动的时间为t秒．（1）当点P恰好在∠ABO的平分线上时，点P的坐标是；（2）当t为何值时，△BOP是以OB为腰的等腰三角形？（3）另有一点Q，从点O开始，按O﹣B﹣A﹣O的路径运动，且速度为每秒2个单位长度，若P，Q两点同时出发，当P，Q中有一点到达终点时，另一点也停止运动．当t为何值时，直线PQ把△ABO的周长分成相等的两部分？2018-2019学年江苏省苏州市常熟市八年级（上）期中数学试卷参考答案与试题解析一、选择题本大题共10小题，每小题3分，共30分.在每小题给出的四个选项中，只有一项是符合题目要求的，请将正确选项前的字母代号填写在答题卷相对应的位置上. 1．【解答】解：A、不是轴对称图形，故本选项不符合题意；B、不是轴对称图形，故本选项不符合题意；C、是轴对称图形，故本选项符合题意；D、不是轴对称图形，故本选项不符合题意．故选：C．2．【解答】解：一天饮水1.9×103mL中的1.9×103精确到100 mL．、故选：D．3．【解答】解：∵9＜10＜16，∴3＜＜4，则2＜﹣1＜3，即2和3之间，故选：B．4．【解答】解：A．无理数包括正无理数、负无理数，此选项错误；B．实数都能用数轴上的点表示，此选项正确；C．带根号的数不一定都是无理数，如＝2是有理数，此选项错误；D．不带根号的数不一定都是有理数，如π是无理数，此选项错误；故选：B．5．【解答】解：留了原三角形的两个角还保留了其中一个边，所以符合ASA判定，故选：A．6．【解答】解：∵P A＝PB，∴点P在线段AB的垂直平分线上，∵PB＝PC，∴点P在线段CB的垂直平分线上，∴P点是△ABC的三边的中垂线的交点，故选：D．7．【解答】解：∵将点P（2，1）向右平移3个单位得到点P1，∴点P1的坐标是（5，1），∴点P1关于x轴的对称点P2的坐标是（5，﹣1）．故选：B．8．【解答】解：∵（a+b）2＝49，∴a2+2ab+b2＝49，∵大正方形的面积为25，∴2ab＝49﹣25＝24，∴小正方形的面积为25﹣24＝1．故选：D．9．【解答】解：过点P1作P1A⊥x轴∵将边长为2的等边三角形沿x轴正方向连续翻折∴P1O＝2，∠P1OA＝60°∴OA＝1，P1A＝OA＝∴P1（1，）同理可求P2（3，），P3（5，）…P n（2n﹣1，）当n＝2018时，点P2018的坐标是（4035，）故选：A．10．【解答】解：设△PCD中CD边上的高是h．∵S△PCD＝S矩形ABCD，∴•CD•h＝•CD•AD，∴h＝AD＝2，∴动点P在与CD平行且与CD的距离是2的直线l上，∵A，D关于直线l对称，连接AC交直线l于点P′，AC的长就是所求的最短距离．在Rt△ABC中，∵AB＝3，BC＝4，∴AC＝＝5，即P A+PB的最小值为5．故选：B．二、填空题本大题共8小题，每小题3分，共24分.把答案直接填在答题卷相对应位置上. 11．【解答】解：∵（）2＝3，∴3的平方根是为．故答案为：±．12．【解答】解：无理数有﹣，这2个，故答案为：2．13．【解答】解：∵|a﹣5|+＝0，∴a﹣5＝0且b+3＝0，∴a＝5，b＝﹣3，∴点P的坐标为（5，﹣3），则点P在第四象限，故答案为：四．14．【解答】解：∵82+152＝172，∴此三角形是直角三角形，且直角边为15，8，那么它的面积S＝×15×8＝60．故答案为：60．15．【解答】解：当腰长AB＝BC＝4cm时，底边为10﹣4﹣4＝2（cm），2，4，4能组成三角形；当底边AB＝4cm时，腰长BC＝（10﹣4）÷2＝3（cm），4，3，3能组成三角形，符合题意．当BC为底时，BC＝10﹣4﹣4＝2（cm）2，4，4能组成三角形，综上所述，BC的长为2cm或3cm或4cm，故答案为：2或3或4．16．【解答】解：∵∠ACB＝90°，EF⊥AB于点D，∴∠ECF＝∠ACB＝∠ADF＝90°，∴∠A+∠B＝90°，∠E+∠B＝90°，∴∠A＝∠E，在△ACB和△ECF中，，∴△ACB≌△ECF（AAS），∴AC＝EC，BC＝CF＝6，∵BE＝16，∴AC＝EC＝BE﹣BC＝16﹣6＝10，故答案为10．17．【解答】解：∵△ABC中，AB＝AC，AD⊥BC，∴AD是△ABC的中线，∴S△ABC＝2S△ABD＝2×AB•DE＝AB•DE＝3AB，∵S△ABC＝AC•BF，∴AC•BF＝3AB，∵AC＝AB，∴BF＝3，∴BF＝6cm，在Rt△ABF中，AF＝＝＝8cm，故答案为8．18．【解答】解：△CDE可以是等腰三角形，∵△CDE是等腰三角形；①当CD＝DE时，∵∠CDE＝30°，∴∠DCE＝∠DEC＝75°，∴∠ADC＝∠B+∠DCE＝105°，②当DE＝CE时，∵∠CDE＝30°，∴∠DCE＝∠CDE＝30°，∴∠ADC＝∠DCE+∠B＝60°．③当EC＝CD时，∠BCD＝180°﹣∠CED﹣∠CDE＝180°﹣30°﹣30°＝120°，∵∠ACB＝180°﹣∠A﹣∠B＝120°，∴此时，点D与点A重合，不合题意．综上，△ADC可以是等腰三角形，此时∠ADC的度数为60°或105°．故答案为60°或105°．三、解答题本大题共10小题，共76分.把解答过程写在答题卷相对应的位置上，解答时应写出必要的计算过程、推演步骤或文字说明.作图时用2B铅笔或黑色墨水签字笔. 19．【解答】解：（1）∵16x2﹣49＝0，∴16x2＝49，∴x2＝，则x＝±；（2）∵24（x﹣1）3+3＝0，∴24（x﹣1）3＝﹣3，则（x﹣1）3＝﹣，∴x﹣1＝﹣，解得：x＝．20．【解答】解：原式＝﹣2+5+﹣3＝．21．【解答】解：根据题意得：ab＝1，c+d＝0，x＝3，y＝3，则原式＝3+0﹣＝2．22．【解答】解：（1）如图，点P即为所求；（2）连接EC．在Rt△ACE中，AE＝5，AC＝12，∴EC＝13，∵EF垂直平分线段BC，∴EB＝EC＝13，∴AB＝EB﹣AE＝13﹣5＝8．23．【解答】解：（1）在图①中，正方形ABCD即为所求；（2）在图②中，以AB为一边画等腰三角形ABC，则顶点C共有6个．故答案为6．24．【解答】解：（1）设∠BAC＝x°，∵AD＝BD，∴∠A＝∠ABD＝x°，∴∠BDC＝2x°，∵BD＝BC，∴∠BDC＝∠BCD＝2x°，∵AB＝AC，∴∠ABC＝∠ACB＝2x°，由∠BAC+∠ABC+∠ACB＝180°可得x+2x+2x＝180，解得：x＝36，则∠BAC＝36°，∠ACB＝72°；（2）∵E是AB的中点，AD＝BD，∴DE⊥AB，即FE⊥AB；∴AF＝BF，∴∠BAF＝∠ABF，又∵∠ABD＝∠BAD，∴∠F AD＝∠FBD＝36°，又∵∠ACB＝72°，∴∠AFC＝∠ACB﹣∠CAF＝36°，∴∠CAF＝∠AFC＝36°，∴AC＝CF，即△ACF为等腰三角形．25．【解答】证明：（1）∵AC＝BC，∠ACB＝90°，∴△ABC是等腰直角三角形，∠A＝∠B＝45°，∵D为AB中点，∴BD＝AD，CD平分∠BCA，CD⊥AB．∴∠DCF＝45°，∵∠EDF＝90°，∴∠ADE+∠EDC＝90°，∠CDF+∠EDC＝90°，∴∠ADE＝∠CDF，在△ADE和△CFD中，，∴△ADE≌△CFD（ASA），∴DE＝DF．（2）∵△ADE≌△CFD，∴S△AED＝S△CFD，∴S四边形CEDF＝S△ADC，∵D是AB的中点，∴S△ACD＝S△ACB＝×2×2＝1．∴S四边形CEDF＝1．26．【解答】解：（1）∵四边形OABC为矩形，点A的坐标为（4，0），点C的坐标为（0，6），∴点B的坐标为（4，6）；当t＝4s时，点P在AB上，AP＝2×4﹣4＝4，∴点P的坐标为（4，4），故答案为：（4，6）；（4，4）；（2）当点P在AB上时，AP＝5，∴OA+AB＝9，∴t＝＝4.5（s），当点P在OC上时，OP＝5，则CP＝6﹣5＝1，∴OA+AB+BC+CP＝17，∴t＝＝8.5（s），综上所述，当点P到x轴的距离为5个单位长度时，求点P移动的时间是4.5s或8.5s；（3）由折叠的性质可知，∠B′＝∠B＝90°，B′C＝BC＝OA＝4，在△CB′E和△AOE中，，∴△CB′E≌△AOE（AAS）∴BE′＝OE，在Rt△CB′E中，CE2＝B′E2+B′C2，即（6﹣OE）2＝OE2+42，解得，OE＝，则点E的坐标为（0，）．27．【解答】（1）证明：∵∠BAC＝90°，∴∠EAD+∠CAE＝90°，∠EDA+∠F＝90°，∵∠EAD＝∠EDA，∴∠EAC＝∠F，∴EA＝ED，EA＝EF，∴DE＝EF．（2）解：结论：BD＝CF．理由：如图1中，在BE上取一点M，使得ME＝CE，连接DM．在△DEM与△FEC中，，∴△DEM≌△FEC，（SAS），∴DM＝CF，∠MDE＝∠F，∴DM∥CF，∴∠BDM＝∠BAC＝90°，∵AB＝AC，∴∠DBM＝45°，∴BD＝DM，∴BD＝CF；（3）解：∵CF＝1，∴BD＝CF＝1，∴BM＝，∵△DEM≌△FEC，∴CE＝EM，∵AB＝AC＝3，∴BC＝3，∴CE＝EM＝CM＝，∴BE＝2．28．【解答】解：（1）如图1，作PH⊥AB于H，在Rt△AOB中，AB＝＝10，∵BP平分∠ABO，PH⊥AB，PO⊥OB，∴PH＝OP，BH＝OB＝6，∴AH＝AB﹣BH＝4，在Rt△APH中，AP2＝PH2+AH2，即（8﹣OP）2＝PO2+42，解得，OP＝3，则点P的坐标为（0，3），故答案为：（0，3）；（2）当点P在OA上时，OP＝OB＝6，∴t＝6÷1＝6（s），当点P在AB上时，作OD⊥AB于D，则BD＝PD，△AOB的面积＝×OA×OB＝×AB×OD，即×6×8＝×10×OD，解得，OD＝4.8，在Rt△OBD中，BD＝＝3.6，则BP＝7.2，∴AP＝10﹣7.2＝2.8，∴OA+AP＝10.8，∴t＝10.8÷1＝10.8（s），当BP＝BO＝6时，AP＝10﹣6＝4，∴OA+AP＝12，∴t＝12÷1＝12（s），综上所述，当t＝6s或10.8s或12s时，△BOP是以OB为腰的等腰三角形；（3）由题意得，OP＝t，OQ＝2t，则t+2t＝×（6+8+10）或24﹣2t+24﹣4＝×（6+8+10解得，t＝4或t＝12，则t为4s或12s时，直线PQ把△ABO的周长分成相等的两部分．。