厦门市2019-2020学年第一学期八年级期中考联考(同安四校)(无听力,答案不全)

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厦门市音乐学校2019-2020年第一学期八年级期中考试英语检测试卷word无答案版(不含听力)

厦门市音乐学校2019-2020年第一学期八年级期中考试英语检测卷第一部分选择题II.语言知识运用（共两节，20小题，每小题1.5分，满分30分）第一节单项选择从每小题所给的A、B、C三个选项中，选出可以填入空白处的正确答案（每小题1.5分，共21分）（）16.－Guess what! Teresa makes her own clothes.－Wow, she is so _______. I could never do that.A. loudB. friendlyC. creative（）17. We’ll try to do _____ work with _____ time than before.A. much; muchB. less; moreC. more; less（）18.－What do you think of Fast & Furious? －It can’t be ______.I don’t like it at all.A. goodB. betterC. worse（）19. Math _______ one of _____subjects in the middle schools.A. are; the importantB. is; the most importantC. is; more important（）20. －Would you mind _____ the piano now? My baby is sleeping.－I’m sorry about that. I’ll go somewhere else.A. to playB. playingC. not playing（）21. You’re so lucky to buy the same ticket at a ______ price.A. cheaperB. lowerC. higher（）22. He ______ story. No one believed him then.A. made upB. brought outC. felt like .（）23. Many Americans try________ Chinese and they plan ______ Chinese every day.A.to learn; speakB. to learn; to speakC. learn; to speak（）24. －Which of the two sweaters will you take?－_________ are OK! They’re for my two cousins.A. NeitherB. AllC. Both（）25. Please call Mr. Smith ______ more________.A. for; informationsB. at; informationC. for; information（）26. The book won’t ______ until the end of the year.A. come outB. come overC. come on（）27.－Susan，you did a good job in China’s Got Talent. －__________.A. Thank youB. You’re welcomeC. No problem第二节完形填空（每小题1.5分，共12分）Most of us have three 28.________ a day. We take food for granted. But experts argue a food crisis(危机)is coming. This crisis is going to make us change the way we think about food.Food is in great need 29.________ a growing of world population. By 1960, the population was three billion. It doubled to six billion by 1999.By 2050, this planet will need to feed at least nine billion people. As a result, the food prices get higher and higher.So, what can a 30.________ , crowed world do? One suggestion is to eat less meat. Meat uses more natural resources(资源)than grains(谷物) .It requires more 31.________ to produce one pound of meat than to produce one pound of grain. It also requires between 5 and 10 times more 32.________ than vegetables. So, eating less meat will provide more land for farming, and it will save water.To eats less meat, people will need to change their eating habits. That will not be easy .Americans, for example, have 33.________ loved meat. World population is increasing, resources are becoming fewer, and food prices are rising. Therefore, we need to rethink 34.________ we eat every day. For meat lovers, we don’t need to give up meat. But we need to eat more grains and 35.________ meat.（）28. A. food B. meals C. dinners（）29. A. instead of B. Thanks to C. because of（）30. A. tired B. thirsty C.hungry（）31. A. time nd C.people（）32. A.meat B.money C.water（）33. A.never B.always C.hardly（）34. A.how B. when C.what（）35. A. less B. little C.fewerIII. 阅读理解（共两节，16小题，每小题2分，满分32分）第一节阅读以下A、B、C三篇短文，根据短文内容，从题中所给A、B、C三个选项中，选出最佳答案（每小题2分，满分）ABump！Bump！Scratch！Adam opened his eyes and looked for the things that was making those scary sounds.The closet door moved as something banged on it from the inside.“Who’s there” Adam asked in a shaky voice.The closet slowly began to open. Adam jumped out of bed and ran to the closet door. He grabbed his desk chair and put it against the door. Then he ran out of his room and down the hall. His brother’s door was wide open, and Adam jumped onto David’s bed.“Adam?” David asked,”What are you doing in here?”“There’s something in my closet!”“You probably had a bad dream. Go back to bed.”“It wasn’t a dream. I was awake, and the closet door started opening by itself!”David sighed, "Fine. But when we don't find anything, you promise to leave me alone for the rest of the night.”Adam nodded. David reached into his desk drawer and pulled out a flashlight. Then they headed to Adam’s room.Adam stopped in the doorway. He could hear something scratching his closet door.“Do you hear that?" Adam asked.David nodded. He walked over to Adam’s bed and pilled the case off one of the pillows. He opened the pillowcase."You open the door very slowly，and I'll grab whatever it is.”Adam puled the closet door open. A small furry creature ran into the pillowcase.“I got it! “ David said, closing the pillowcase and holding it in the air.“What is it?” Adam moved closer as David peeked inside.David put the pillowcase on the bed and an orange cat climbed out.“Apricot? How did you get trapped in my closet?”David laughed. “The poor cat. If I was locked in your closet with your stinky shoes, I’d be banging on the door to get out, too!”( )36. What happened right after David went into Adam’s room?A. Adam jumped into David’s bed.B. David grabbed a flashlight from his desk drawer.C. David heard the noise coming from Adam’s.( )37. What did David plan to do with the pillowcase?A. Scare the creature in the closetB. Catch the creature in the closetC.hit the creature in the closet( )38. What was making strange sounds in Adam’s pillowcase?A monster B. A cat C. A dog( )39. What do you think of David?A. BraveB. funnyC. outgoingBFive years after the late Seattle billionaire(亿万富翁) Paul Allen challenged researchers to come up with an artificial intelligence (AI) Program smart enough to pass an eight-grade science test, that program has been declared accomplished(完成).The AI system Aristo recently passed the same eighth-grade science test some US students take. Aristo software scored 90% on a multiple0choice test and better than 80% of high school students.This is an example of the progress being made in AI development. Four years ago, 700 computerscientist tried to develop AI system that could pass this kind of exams. None scored higher than 60percent.One of the main reasons why Aristo was able to pass the exam is that it can not only understand language, but also use logical thinking to solve difficult problems. For example, it can understand what a forest fire is and how it can affect animals.There are shortcomings, of course: The exam excluded questions that depended on interpreting pictures ofdiagrams. Those questions would have required visual interpretation skills that aren’t yet programmed into Aristo . Questions requiring a direct answer ( that is, essay questions) were also left out. And for what it’s worth, Aristo would have been useless outside the areas of science in which it was trained.Nevertheless, Aristo’s success means that we might see new AI-based products(人工智能产品), such as search engines (搜索引擎) and database (数据库) for hospitals. AI systems might be able to understand users in the future.( ) 40. What did the AI system Aristo do?A. Help students study.B. Pass a school test.C. Talk like a human does.( ) 41. What was Aristo’s biggest success?A.It passed different kinds of tests.B. It passed the tests with a perfect score.C. It scored 90 percent on the test.( ) 42. Paragraph 5 is written to __________.A.explain how Aristo learned to answer questions.B. show what else Aristo can do.C. tell us the shortcomings of Aristo.( ) 43. From the story we can learn that __________.A.robots can’t think logically.B. AI systems might be used in many fields.C. AI-based products are not useful.CAnger is a kind of feeling. Many things can make you angry. When your teacher gives you too much homework, when your team loses an important game, when a friend borrows your favorite thing and then breaks it, you may get really angry.Usually, your body will tell you when you are angry. For example, you breathe (呼吸) faster, your face turns red, and you may want to break something or hit (打) someone, but sometimes, you hide (隐藏) your anger. For example, you may hide it in your heart. The problem is that if you do this, you may get a headache or your stomach may hurt.In fact, it's not good to hide your anger, and it's normal for you to get angry sometimes. But anger must be let out in the right way, without hurting others or yourself. When you get angry, you can talk about it with other people. It's helpful to talk about your anger with an adult (成年人，大人), such as parents, a teacher, etc.When you talk about anger, those bad feelings can start to go away. Here are some other things you can do when you start to feel angry: talk to a good friend; count from 1 to 100; give someone a hug (拥抱); go for a bike ride; think about good things, etc.Remember that how you act when you are angry can make everything better or worse. Don't let your anger control you. ( ) 44 . You may not get angry when ____.A.there is too much homework on this weekendB. your parents don't let you watch TVC. a friend breaks your favorite thing( ) 45. ____ shows that you're not angry.A. Taking a faster breathB. Getting a stomachacheC. Wanting to protect someone( ) 46. According to the passage, you can do everything when you get angry except (除了) ____.A.go for a bike rideB. think about good thingsC. say bad things to the people around you( ) 47. The underlined word "control" in the last paragraph means ____ in Chinese.A. 控制B. 连接C. 遥控第二部分（非选择题）第二节阅读D篇短文，根据短文内容及要求完成各题（每小题2分，满分8分）DI have a new pet dragon. So I tried to feed him sprinkle cake,He followed me from a dream. But he said that would keep him awakeBut I can’t tell my mom,It would only make her scream. I tried to feed him some fish ,But he really didn’t like that dish.I tried to feed him fried rice, Then I tried to feed him cheese,But he didn’t like the spice. That’s when he said “more, please.”So I tried to feed him applesauce,But he said it made his eyes cross. Now my mom is wondering why,We can’t keep cheese in the house.I tried to feed him gingerbread, I heard her last night telling Dad,But he said it only hurt his head. She thinks we have a mouse.根据短文内容，回答下面问题48. Where did the dragon come from?____________________________________________________________________________49. Why didn’t the dragon eat cake?____________________________________________________________________________50. What’s the dragon’s favorite food?____________________________________________________________________________51. Why does the writer’s mother think they have a mouse in the house?____________________________________________________________________________IV. 书面表达（共5节，满分58分）第一节：连词成句重新排序所给词汇，组成正确的句式表达（每小题2分，满分10分）52. movies，I，go，to，month，the，once，a.____________________________________________________________________________.53. to, what, do, watch, you, tonight, plan.____________________________________________________________________________？54. thinks，Tina, she, than, works, harder, me.____________________________________________________________________________.55. can, buy, you, cheaply, the, there, most, clothes.____________________________________________________________________________.56. and, day, report, hope, TV, be, to, excellent, one.____________________________________________________________________________.第二节：完成句子根据语用提示，完成句子（每小题2分，满分10分）57. 开学初，你想问Judy假期去哪里度假，你这么问：Judy ,_______________________________________________________________________？58. 你想问对方她多久看一次电视，你这么问：____________________________________________________________________________？59. 你觉得Nick是班上最受欢迎的，你这样说：____________________________________________________________________________.60. 你的朋友想向你了解万达电影院怎么样，他会这样问：_______________________________________________________________Wanda Cinema？61. 你喜欢看新闻，别人问为什么的时候，你这样解释：I like news,because____________________________________________________________.第三节：短文填空阅读下面短文，根据语境、音标或所给的提示，在每个空格内填入一个恰当的词，要求所填的词意义准确、形式准确，使短文意思完整，行文连贯。

福建省厦门市四校2019-2020学年八年级上学期期中考试物理试题

2019-2020年八年级（上）期中联考物理试卷（试卷满分：100分；考试时间：90分钟）注意事项：1.全卷六大题，33小题，试卷共6页，另有答题卡；2.答案一律写在答题卡上，否则不能得分，交卷时只交答题卡；3.作图题可以直接用2B笔画；考试学校：梧侣学校、第二外国语学校等一、选择题（本大题共16小题。

每小题2分，共32分）1.一支未使用过的2B铅笔的长度最接近于A．10 cm B．20 cm C．30 cm D．40 cm2.看电视的《新闻联播》时，说“电视声音太大了”是指声音的A．响度大 B．音调高 C．音色好 D．频率大3.速度是52km/h的运动物体可能是A．行人 B．卡车 C．飞机 D．人造地球卫星4.下列哪位科学家建立了运动三大定律，构建经典力学体系A．牛顿 B．爱因斯坦 C．坡尔 D．伽利略5.战国时期，《墨经》中记载了影子的形成、平面镜的反射等光学问题。

图1 中的光学现象与影子的形成原理相同的是图16.有关误差的正确说法是A．误差是由测量者的粗心造成的 B．误差是完全可以避免的C．误差就是测量中的错误 D．采取多次测量取平均值的方法可以减小误差7.某物体做匀速直线运动，由公式v=s/t可知，物体A．速度与路程成正比 B．速度大小恒定不变C．速度与时间成反比 D．以上说法都对8.阳光灿烂的日子，在茂密的树林下，常能在地上见到许多圆形的光斑，这些光斑是A.太阳的实像B.太阳的虚像C.树叶的影子D.树叶的实像9.用同一把刻度尺三次测量某物体长度的测量结果分别为3.51cm、3.52cm、3.52cm，则该物体长度应记为A. 3.51 cmB. 3.517 cmC. 3.52 cmD. 3.5 cm10.以下措施中，从传播过程中减弱噪声的是A.厦门岛内禁止燃放烟花爆竹B.鼓浪屿禁止商家导游使用扩音器C. 地铁施工时给机器加润滑油D.BRT路段两侧设有透明板墙11.下列有关声音的利用说法正确的是A. 医生利用望闻问切中的问是通过声音来传递能量的B. 超声波洗眼镜是利用声音传递信息的C. 回声定位是利用声音传递信息的D. 超声波碎石是通过声波传递信息的12.一个物体做匀速直线运动，在4s内通过20m，该物体在第2s内通过的路程是A．大于5m B．等于5m C．小于5m D．不能确定13.甲乙两物体运动的路程比 2：1 ，所用时间比为 1 ：2 ，则两者速度比为A. 4 ：1B. 1 ：1C. 1 ：2D. 2 ：114.由于视觉原因，用鱼叉刺向水里的鱼往往难于成功．下图2中能正确解释刺不到鱼的光路图是图215.早在两千多年前，墨子就在《墨经》中记录了小孔成像现象．关于图3的小孔成像实验，下列说法正确的是A．烛焰经小孔成正立的像B．蜡烛燃烧不断缩短，烛焰的像向下移动C．蜡烛靠近小孔，烛焰的像大小不变D．只将小孔由圆形改为三角形，像的形状不变图316.如图4甲是小车甲运动的s－t图像，图乙是小车乙运动的v－t图像，由图像可知A. 甲、乙都由静止开始运动B. 甲、乙都以2.0 m/s匀速运动C. 甲、乙两车经过5 s一定相遇D. 甲车速度越来越大，乙车速度不变图4二、填空题（本大题共6小题。

2019-2020学年(上)厦门初二质量检测(含答案)

2019-2020学年（上）厦门初二质量检测（含答案）语文试卷满分（150分钟考试时间120分钟）考生注意：1。

全卷三个部分，共23题。

2.答案写在答题卡上，否则不得分。

一、积累与运用（20分）1.补写下列句子中的空缺部分。

（1）采菊东篱下，____________________________。

（陶渊明《饮酒》（其五）(2分) （2）____________________________，芳草萋萋鹦鹉洲。

（崔颢《黄鹤楼》）(2分) （3）几处早莺争暖树，）____________________________。

（白居易《钱塘湖春行》）(2分)（4）____________________________，提携玉龙为君死。

（李贺《雁门太守行》）(2分)（5）____________________________，学诗谩有惊人句。

(李清照《渔家傲》)(1分) (6)窩贵不能淫,____________________________,成武不能屈。

(《孟子・富贵不能淫》)(1分)7)夕目欲颓, ____________________________。

(陶弘景《答谢中书书》)(1分)(8)何夜无月?____________________________。

(苏轼(く记承天寺夜游))(2分〉(9)《使至塞上》中描写塞外风光、雄壮开阔的两句是:“____________________________，____________________________。

(2分)（1）悠然见南山（2）晴川历历汉阳树（3）谁家新燕啄春泥（4）报君黄金台上意（5）我报路长嗟日暮（6）贫贱不能移（7）沉鳞竞跃（8）何处无竹柏但少闲人如吾两人者耳（9）大漠孤烟直长河落日圆2.下列何子没有语病的一项是( )(3分)A.南北视时期,由于北方民族的大融合,为隋统一金国创造了条件。

B.我们的报刊、杂志、电视、媒体和一切出版物,有资任做出表率。

厦门市第五中学2019-2020学年第一学期八年级期中考试(word版无听力部分无答案)

厦门市第五中学2019-2020学年第一学期期中考试八年级英语试卷II.语言知识运用（共两节，20小题，每小题1.5分，满分30分)第一节单项选择从每小题所给的A、B、C三个选项中，选出可以填入空自处的正确答案（每小题1.5分，满分18分)21.-Would you like some hamburgers?-No,thanks.I am notA.boredB.tiredC.hungry22.-Tom,don't me.Your hands are so ditrty.-Oh,I am so sorry.A.loseB.touchC.choose23.-Dale,why do you go out of the living room?-Because it's too hot there,I can't itA.mindB.reachC.stand24.-What are you doing,Daisy?-I'm using the Internet to find out more about the news.petitionrmationcation25.-I really enjoy the song Won't Cry by Jay Chou.-Me,too.It has become one of songs these days.A.the loudestB.the funniestC.the most popular26.一do you do sports?Oh,I run at least 10 minutes at school every day.A.How oftenB.How longC.How many27.-Unbelievable,the little girl is able to speak English as as her teacher.-She keep's on practicing every day.A.wellB.trulyC.hard28.-WeChat Pay makes our life easier，sometimes it's not safe.-Yes,we should be careful.A.HoweverB.BecauseC.Though29.-Sophie,how was your Halloween party?Great!We like ghosts and witches.A.took upB.got upC.dressed up30.-It's for us to keep secrets for our fiends. In this way, we can win their trust. -Yeah,I can't agree more.A.necessaryB.physicalC.enjoyable31.-Mom,l am going to read in the new library this Saturday morning-Sounds like a good plan. You can sit there and enjoy your time slowlyA.beautifullyfortablyC.seriously32.-Oh,we missed the bus to the museum.-.we can go there by taxi and it's faster.A.No problemB.Not reallyC.Never mind第二节完形填空从每小题所给的A、B、C三个选项中，选出可以填入空白处的最佳答案（每小题1.5分，满分12分）My name is Sam.I joined a club called "passing help"last month.Let me tell you why I joined it.One evening this May, on my way home my old car broken down.It was 25 miles from my home.I wanted to get a ride,but there was no car.It was also hard to take a taxi.I decided to take a 33 home.I went to a bus stop nearby.After a while,a bus came,34 ,it did not go to my town.The bus driver was a young woman.She was kind and she told me which bus I should take.I waited there for about thirty 35 ,but no bus came.At last a car came to me and a woman came 36 of the car.She was just the bus driver.“When I reached the bus station,I 37 that the bus to your town couldn't come,so I returned here.I just can't leave you here,"she said,"Get in my car and I will 38 you back to your home.”“It is a long way."I said.“Come on,sir,”she said,“Let's go.”On the way she told me a story.A few days 39 ,there wasn't gas(汽油）in her car.An old man drove her up to a gas station and then back to her car.When we got to my home,I wanted to give her some money to thank her,but she didn't accept her.“"I only want to help others and do 40 nice for somebody.Pass it along.”She said.33.A.subway B.taxi C.bus34.A.so B.however C.because35.A.days B.hours C.minutes36.A.out B.in C.on37.A.looked out B.found out C.came out38.A.give B.take C.wait39.A.ago ter C.before40.A.something B.nothing C.everythingⅢ阅读理解（共两节，16小题，每小题2分，满分32分)第一节阅读以下A、B、C三篇短文，根据短文内容，从题中所给A、B、C三个选项中，选出最佳答案（每小题2分，满分24分)AIn a cold winter,a couple had to move out of their big house because of bankruptcy(破产).The husband worked day and night to support the family but with no care of his wife.So she thought,"he doesn't love me anymore,he just cares his business...not me".One day,she began to take a bath,he stopped her at the door,"Let me take it first,OK?""Why not let me shower first,"she asked."I was tired, sweetie,you take it later,OK?" She was sad.On a rainy day,she found nothing to do and turned on his computer,a few words blurred her eyes...it was his diary:Today,I was quite sad,she asked me why I was always taking the bath first, and I said to her, I was tired.She was unhappy,in her mind,I treated her not as well as usual,but how can I do? I wasn't as rich as before! We moved to the small apartment,there was only a shower in such a freezing winter.But I found that if one person took the shower first,the room could get a litter warm,soevery time I rushed to the bathroom first.I was thinking that,when she took the shower, the room would get warmer,at least 1 Ⅲ.Now I cant give her comfortable life，bring her the luxury restaurant，buy expensive dresses for her，but at least，I can give her 1℃love.45.41.The couple moved out of their big house becauseA.the house was oldB.the house was brokenC.they didn't have enough moneyD.they didn't like to live in the house46.42.The weather was when the wife read her husbands diary.A. B. C. D.47.43.The underlined word luxury in the last paragraph means" " in Chinese.A.愉快的B.豪华的C.敞亮的D.流行的48.44.The best title of the passage may beA.The Poor CoupleB.The 1℃LoveC.Husband and WifeD.A Cold WinterBWashing machines and dryers are part of our lives and they seem too important to give up.Maybe no one knows it better than Akbar Cook,a high school headmaster in New Jersey,USA.After he put some washing machines and dryers in his school,the students' attendance rate(出勤率）went up by 10%.Over half of the students in high school used to miss,three to five days of classes a month.Why?Cook looked into it and found one of the top reasons was that many students couldn'tafford to do the laundry！Their families were too poor，sometimes even had no money to eat.They didnt want to be laughed at or bulied at school because their clothes were dirty.So they chose to stay at home.Cook felt sad and came up with an idea to solve the problem.He turned the school football locker room(更衣室）into a laundry room with five washing machines and five dryers.Students are able to come in and do the laundry for free there.What's more,while the students are waiting for their clothes,they can work with a teacher on subjects like science and math in the room next to the laundry room.Cook believes "a small change can make a big difference".What he did has made a real change in his students' lives.And his little idea of introducing a laundry room to the high school is so successful that it has started a snowball of change in the USA.45.The story happened inA.ChinaB.AmericaC.AustraliaD.Japan46.About of the students in the high school used to miss classes.A.10%B.45%C.55%D.25%47.The underlined phrase the problem in Para.3 refers thatA.many students couldn't afford to do the laundryB.some students didn't like to go to schoolC.the school didn't have a laundry roomD.the students liked to laugh at each other48.According to the passage,we can infer thatA.the students should pay money for doing the laundry at schoolB.students in the high school didn't mind wearing dirty clothesC.the high school didn't have a school football locker beforeD.Akbar Cook is smart and loves his students very muchCWhen you are thirsty,you might want to drink water. However,a new study has found that drinking water is not the best way to stay hydrated(补水的）.Water does a good job of hydrating the body quickly,according to British researchers.However, drinks with a little bit of sugar,fat or protein(蛋白质）can do a better job.Why is that? The more you drink,the faster the drink leaves your stomach（胃）and goes into your bloodstream(血流).There,it can dilute(稀释）the body's fluids(液体）and keep you k,for example,has some sugar,protein and fat.These make fluids leave your stomach more slowly and keep you hydrated for a longer time.However,drinks with more sugar,such as fruit juice or soda,are not more hydrating.When these drinks go into the small intestine(小肠),they take more water from the body into the small intestine to help deal with the sugar.This will make you feel even thirstier.49.The new study finds thatA.drinking too much water is bad for you.B.drinking water is the best way to stay hydrated.C.drinking too much water can't help the body stay hydratedD.drinks with a little sugar are more hydrating than water.50.How does water keep you hydrated?a.Water goes into the bloodstream.b.Water enters your stomach.c.The body is hydrated.d.Water leaves the stomach.e.The body's fluids get more water.A.b-a-d-c-e.B.b-d-a-e-cC.b-a-e-d-cD.b-d-a-c-e51.Sugary drinks can't keep you hydrated because .A.these drinks can't go into your bloodstream.B.these drinks leave the stomach quickly.C.it takes more water to deal with the sugar.D.the small intestine can't dilute these fluids.52.Which of these drinks can hydrate you the most?A. B. C. D.第二节阅读D篇短文，完成下刚表格，每空不超过三个词。

(完整word版)2019-2020厦门市八年级上学期数学质检试题

2019—2020学年(上)厦门市八年级质量检测数学（试卷满分：150分考试时间：120分钟）准考证号姓名座位号注意事项：1．全卷三大题，25小题，试卷共4页，另有答题卡． 2．答案必须写在答题卡上，否则不能得分． 3．可以直接使用2B 铅笔作图．一、选择题（本大题有10小题，每小题4分，共40分.每小题都有四个选项，其中有且只有一个选项正确） 1.计算2－1的结果是A . 0B . 12C . 1D .22.下列长度的三条线段能组成三角形的是A . 3，4，7B . 3，4，8C . 3，3，5D . 3，3，73.分式xx －2有意义，则x 满足的条件是A . x ≠2B . x ＝0C . x ＝2D . x ＞2 4. 如图1，在△ABC 中，AD 交边BC 于点D .设△ABC 的重心为M ，若点M 在线段AD 上，则下列结论正确的是A . ∠BAD ＝∠CADB .AM ＝DMC . △ABD 的周长等于△ACD 的周长 D .△ABD 的面积等于△ACD 的面积 5.已知正方形ABCD 边长为x ，长方形EFGH 的一边长为2，另一边的长为x ，则正方形ABCD 与长方形EFGH 的面积之和等于A .边长为x ＋1的正方形的面积B . 一边长为2，另一边的长为x ＋1的长方形面积C . 一边长为x ，另一边的长为x ＋1的长方形面积D . 一边长为x ，另一边的长为x ＋2的长方形面积6.从甲地到乙地有两条路：一条是全长750km 的普通公路，另一条是全长600km 高速公路.某客车从甲地出发去乙地，若走高速公路，则平均速度是走普通公路的平均速度的2倍，所需时间比走普通公路所需时间少5小时.设客车在普通公路上行驶的平均速度是x km /h ，则下列等式正确的是 A . 600x ＋5＝7502x B . 600x －5＝7502x C .6002x ＋5＝750x D . 6002x －5＝750x7.在△ABC 中，D ，E 分别是边AB ，AC 上的点，且AD ＝CE ，∠DEC ＝∠C ＝70°， ∠ ADE ＝30°，则下列结论正确的是A ．DE ＝CEB ．BC ＝CE C ．DB ＝DED ．AE ＝DB图18.在平面直角坐标系中，O 是坐标原点，点A （3，2），点P （m ，0）（m ＜6），若△POA 是等腰三角形，则m 可取的值最多有A . 2个B .3个C .4个D . 5个9. 下列四个多项式，可能是2x 2＋mx －3 (m 是整数)的因式的是A . x －2B . 2x ＋3C . x ＋4D . 2x 2－1 10. 如图2，点D 在线段BC 上，若BC ＝DE ，AC ＝DC ，AB ＝EC ，且∠ACE ＝180°—∠ABC —2x °，则下列角中，大小为x °的角是A . ∠EFCB . ∠ABC C . ∠FDCD . ∠DFC二、填空题（本大题有6小题，每小题4分，共24分）11.计算：（1）(2a )3＝；（2）3a (5a 2＋2b 2) ＝ . 12.计算：4x 23y ·3yx3＝ .13. 如图3，在△ABC 中，∠ACB ＝90°，AD 平分∠CAB ，交边BC 于点D ，过点D 作DE ⊥AB ，垂足为E .若∠CAD ＝20°，则∠EDB 的度数是 . 14. 如图4，有一张边长为x 的正方形ABCD 纸板，在它的一个角上切去一个边长为y 的正方形AEFG ，剩下图形的面积是32，过点F 作FH ⊥DC ，垂足为H .将长方形GFHD 切下，与长方形EBCH 重新拼成一个长方形，若拼成的长方形的较长的一边长为8，则正方形ABCD 的面积是 . 15. 已知锐角∠MPN ，依照下列步骤进行尺规作图：（1）在射线PN 上截取线段P A ；（2）分别以P ，A 为圆心，大于12P A 的长为半径作弧，两弧相交于E ，F两点；（3）作直线EF ，交射线PM 于点B ；（4）在射线AN 上截取AC ＝PB ；（5）连接BC .则∠BCP 与∠MPN 之间的数量关系是 .16.在△ABC 中，∠C ＝90°，D 是边BC 上一点，连接AD ，若∠BAD ＋3∠CAD ＝90°，DC ＝a ，BD ＝b ，则AB ＝ . （用含a ，b 的式子表示）三、解答题（本大题有9小题，共86分）17.（本题满分12分）（1）计算：(y ＋2)(y —2) ＋(2y —4)(y ＋3)；（2）分解因式：2a 2x 2＋4a 2xy ＋2a 2y 2.18. （本题满分7分）如图5，点B ，E ，C ，F 在一条直线上，AB ＝DE ，∠A ＝∠D ，AB ∥DE. 求证：BE ＝CF .F A B CD E图2 ABCDE图3AB DCE F图5FA B CD EHG图4先化简，再求值：1m 2－49÷1m 2－7m＋1，其中m ＝2.20. （本题满分8分）已知点A （1，1），B （－1，1），C （0，4）. （1）在平面直角坐标系中描出A ，B ，C 三点；（2）在同一平面内，点与三角形的位置关系有三种：点在三角形内、点在三角形边上、点在三角形外.若点P 在△ABC 外，请判断点P 关于y 轴的对称点P ′与△ABC 的位置关系，直接写出判断结果.21. （本题满分8分）如图6，在△ABC 中，AB ＝AC ，过点B 作BD ⊥AC ，垂足为D ，若D 是边AC 的中点，（1）求证：△ABC 是等边三角形；（2）在线段BD 上求作点E ，使得CE ＝2DE . （要求：尺规作图，不写画法，保留作图痕迹）22. （本题满分9分）某企业在甲地有一工厂（简称甲厂）生产某产品，2017年的年产量过万件，2018年甲厂经过技术改造，日均生产的该产品数是该厂2017年的2倍还多2件. （1）若甲厂2018年生产200件该产品所需的时间与2017年生产99件该产品所需的时间相同，则2017年甲厂日均生产该产品多少件？（2）由于该产品深受顾客欢迎，2019年该企业在乙地建立新厂（简称乙厂）生产该产品.乙厂的日均生产的该产品数是甲厂2017年的3倍还多4件.同年该企业要求甲、乙两厂分别生产m ，n 件产品（甲厂的日均产量与2018年相同），m :n ＝14:25，若甲、乙两厂同时开始生产，谁先完成任务？请说明理由.图6AB CD已知一些两位数相乘的算式：62×11，78×69，34×11，63×67，18×22，15×55，12×34，54×11. 利用这些算式探究两位数乘法中可以简化运算的特殊情形：（1）观察已知算式，选出具有共同特征的3个算式，并用文字描述它们的共同特征；（2）分别计算你选出的算式.观察计算的结果，你能发现不经过乘法运算就可以快速、直接地写出积的规律吗？请用文字描述这个规律；（3）证明你发现的规律；（4）在已知算式中，找出所有可以应用（或经过转化可以应用）上述规律的算式，并将它们写在横线上： .24. （本题满分11分）在△PQN 中，若∠P ＝12∠Q ＋α（0°＜α≤25°），则称△PQN 为“差角三角形”,且∠P 是∠Q 的“差角”.（1）已知△ABC 是等边三角形，判断△ABC 是否为“差角三角形”，并说明理由；（2）在△ABC 中，∠C ＝90°，50°≤∠B ≤70°，判断△ABC 是否为“差角三角形”，若是，请写出所有的“差角”并说明理由；若不是，请说明理由.25. （本题满分14分）如图7，在四边形ABCD 中，AC 是对角线，∠ABC ＝∠CDA ＝90°，BC ＝CD ，延长 BC 交AD 的延长线于点E . （1）求证：AB ＝AD ；（2）若AE ＝BE ＋DE ，求∠BAC 的值；（3）过点E 作ME ∥AB ，交 AC 的延长线于点M ，过点M 作MP ⊥DC ，交DC 的延长线于点P ，连接PB .设PB ＝a ，点O 是直线AE 上的动点，当MO ＋PO 的值最小时，点O 与点E 是否可能重合？若可能，请说明理由并求此时MO ＋PO 的值（用含a 的式子表示）；若不可能，请说明理由.图7B E DC A。

2019-2020学年厦门一中八年级(上)期中英语试卷

2019-2020学年厦门一中八年级（上）期中英语试卷（样卷）听力部分（25分）I.听句子，根据所听内容选择最佳应答句．句子念两遍．（共5小题，每小题1分）1．（1分）A．Thank you very much．B．I just had a look around．C．I'm so sorry2．（1分）A．Not at all．B．I'm having a bad fever．C．Yes，it's a big trouble．3．（1分）A．Turn left．B．It is near here．C．It's so easy．4．（1分）A．At the supermarket．B．Eight dollars．C．By bike．5．（1分）A．It's sunny．B．It's Sunday．C．It's July 1st．II.听对话，根据对话内容选择最佳答案．对话念两遍．（共3小题，每小题2分）6．（2分）听第一段对话，回答小题．（1）Why does the man hope his computer can work fast？A．He needs it to play games．B．His job depends on it．C．He has a lot of money．（2）What color does the man not like？A．Black．B．White．C．Red．7．（2分）听第二段对话，回答小题．（1）How many ways of connecting with others did the speakers talk about？A．Three．B．Four．C．Five．（2）What does the man think of using these new ways of connecting with others？A．Convenient．B．A little dangerous．C．Difficult．8．（2分）听第三段对话，回答小题．（1）When did the boy start to play number games？A．Fifteen years ago．B．Five years ago．C．Ten years ago．（2）What is the lady's job probably？A．A teacher．B．A doctor．C．A reporter．III.听短文，根据所听内容选择最佳答案．短文念两遍．（共1小题，每小题4分）9．（4分）（1）What do many people think of playing computer games？A．It is bad for study and health．B．It is a good way to connect with others．C．It can also be a job．（2）Why do they think so？A．Some children can connect with others in this way．B．Students play computer games all day．C．Playing computer games can make people happy．（3）How do computer games help people？A．By helping people feel relaxed and make many friends．B．By helping people make more moneyC．By helping people get prizes．（4）In the writer's mind，what is a bad thing？A．The invention of computer games．B．People can't control themselves well in playing computer games．C．Students often have lessons on computers．IV.听短文，根据所听内容和思维导图补全短文．短文念两遍．（共1小题，每空2分）10．（10分）Good afternoon，everyone! Today，my topic is how to be an inventor．In my opinion，people need to do at least three things to be an inventor．The first thing is that they must get （1）in inventing things because interest will bring people a lot of （2）The second is that people must have enough （3）because they need to have the ability to face many problems．So to read all kinds of （4）is necessary．The last and most important is that people must have a （5）mind．When people do experiments，they will meet many difficulties and they will need to try again and again．笔试部分（75分）第一卷选择题（50分）I.词汇测试（5分）i.从下面每小题的A、B、C 三个选项中选出可以替换划线部分的最佳选项．（共5小题，每小题0.5分）11．（.5分）﹣Oh，I forgot to turn off the light on the second floor．﹣Push the button on your left because it controls all the lights．（）A．creates B．sells C．operates12．（.5分）﹣Could you remember all the numbers correctly？﹣It's a little difficult，but I can have a try．（）A．quickly B．rightly C．probably13．（.5分）﹣Finally，I realized that he told a big lie to me．﹣B ut it's too late to change everything．（）A．came to know B．came to achieveC．began to say14．（.5分）﹣I'm afraid to speak English when I talk with others．﹣Open your mouth and speak loudly．Nobody will laugh at you．（）A．Somebody B．Anybody C．No one15．（.5分）﹣There is nothing special with this cake．Why do you like it so much？﹣Taste it and you will find it different from the others．（）A．excellent B．unusual C．usualii.根据句子意思，从下面每小题的A、B、C三个选项中选出恰当的词语完成句子．（共5小题，每小题0.5分）16．（.5分）﹣He just ran out of the office_____．What happened？﹣It seems that someone called him outside．（）A．hardly B．successfullyC．suddenly17．（.5分）﹣Look at the skirt．You will look beautiful in it．Why not try it on？﹣It's_______ and I don't have enough money to buy it．（）A．expensive B．convenient C．cheap18．（.5分）﹣Don't drive at such a fast______．It's dangerous．﹣Sorry，I won't do that．（）A．height B．distance C．speed19．（.5分）﹣You'd better____________ these questions on your notebooks．They're important to you．﹣Thank you for your advice．I'11 do that．（）A．get off B．copy downC．worry about20．（.5分）﹣Today people_________ technology too much．﹣Yes，many people don't know how to live without computers or mobile phones．（）A．look up B．look for C．depend onII．完形填空（15分）阅读下面短文，从短文后所给的A、B、C三个选项中选出能填入相应空白处的最佳选项．（共1小题，每小题1.5分）21．（15分）Emmoni Lopez is a girl from Chicago．In the past，she（1）dance lessonswhile her elder brothers wrestled （摔跤）．But it（2）that she liked wrestling a lot．She joined a wrestling club three years ago．Lopez is not（3）．A number of girls in the USA are interested in wrestling．The officials of the Illinois Kids Wrestling Federation （IKWF）said they saw more girls taking part in the（4）in recent years．From 2015 to 2018，many girls joined the IKWF．The（5）of girls grew from 363 to 503．"There is a game just for（6）at the end of each year．In Lopez's club，about half of the students are girls．The club also has an all﹣girls camp．As Lopez's coach Frankie Zepeda said，"Many of the girls become interested in wrestling through their brothers．（7）they just learn to fight back．"One of those girls is Yamilet Aguirre，12．She did it because she was bored with just watching her brother wrestle．"It is（8）to wrestle，so I want to have a try，" she said．"Girls are just as（9）as boys are．"Some schools will（10）girls' wrestling programs．This will give girls more chances to do it．（1）A．took B．watched C．put（2）A．spoke B．showed C．decided（3）A．careful B．healthy C．alone（4）A．housework B．dance C．sport（5）A．fact B．number C．hobby（6）A．teachers B．boys C．girls（7）A．Maybe B．Hardly C．Suddenly（8）A．fun B．foolish C．friendly（9）A．popular B．cute C．strong（10）A．start B．lock C．orderIII.阅读理解（30分）阅读下列短文，从下面每小题的A、B、C、D四个选项中选出最佳选项．（共4小题，每小题1.5分）22．（7.5分）Orlando Disney World：（1）Which of the following can be put into the blank？A．Places and Interests．B．Hobbies and Prices．C．Facts and Numbers．D．Clubs and Activities．（2）How many buses are there in the park？A．50．B．263．C．163．D．150，000．（3）What may you see in Orlando Disney World？A．Lots of restaurants．B．Lots of animals．C．Lots of trains．D．Lots of planes．（4）Which of the following statements about Orlando Disney World is NOT true？A．People can take buses to travel around the park．B．The park must be very beautiful and popular．C．About 150，000 people visited the park in 2003．D．The park uses 606，000 pounds of bananas in a year．（5）What's the passage？A．A story．B．A notice．C．A poem．D．A report．23．（7.5分）There are many inventions in the world．They are great and useful．The first great invention is the wheel and it is still widely used today．It is useful because it makes travelling long distances easier．In the early 1800s，the world started to change．There was little unknown land in the world，but people needed to live，so they began to work to make the life better．In the 19th century，people made many great inventions．The camera and the light bulb were among them．There were more great inventions in the early 20th century，such as helicopters in 1907，movies with sound in 1910 and jet planes in the 1930s．This was also a time when a new material （布料）was first made．Nylon （尼龙）came out in 1935．It changed the kind of clothes people wore．By that time most people had had a very good life．Humans had a desire to know more．So they began looking for ways to go into space．Russia （俄国）made the first step．Since then other countries，including the United States and China，have made their steps into space．In 1969，humans took the biggest step．An American first walked on the Moon．This was certainly just a beginning．There will be more and more new inventions in the future and they will some day allow us to do things we have never dreamed of doing．（1）Why is the wheel a useful invention？A．Because it is safe to travel with it．B．Because it makes people travel for free．C．Because it is easier to travel long distances with it．D．Because it makes people keep in touch with each other anytime．（2）Which was the first country going into space？A．Russia．B．China．C．America．D．Japan．（3）How many inventions in the 19th and early 20th century are mentioned in the passage？A．Five．B．Six．C．Seven．D．Eight．（4）What does the underlined part "a desire" mean？A．A good way．B．A strong wish．C．A new inventionD．A wonderful dream．（5）What does this passage mainly talk about？A．Why wheels were very important．B．The great dreams people have．C．Which country made the first step into space．D．The great inventions in the world24．（7.5分）Watching TV is a popular activity in the UK．But what kind of programs do British people like to watch？They are dramas （戏剧）about ordinary life in the UK．We call those dramas "soap operas"The popular ones are usually on at least four times a week there．In the early days of the TV，there were dramas on during the day．Back in those days，men usually went out to work and women stayed at home and looked after the children．Most of those dramas were for women．People selling soaps would show the soaps at times when those dramas were on．The word "soap" came from here．Then what about the word "opera"？Well，that's because those dramas were often exaggeration （夸张）of the real life．Most soap operas these days are on in the evening．Each soap opera will have a different。

福建省厦门一中2019-2020学年八年级(上)期中数学试卷含解析

2019-2020学年八年级（上）期中数学试卷一．选择题（共10小题）1．下列国产车标属于轴对称图形的是（）A．B．C．D．2．下列四个图形中，线段BE是△ABC的高的是（）A．B．C．D．3．（2a）2的计算结果是（）A．4a2B．2a2C．4a D．4a44．点（3，﹣2）关于x轴的对称点是（）A．（﹣3，﹣2）B．（3，2）C．（﹣3，2）D．（3，﹣2）5．△ABC中，AB＝AC，∠A＝∠C，则∠B＝（）A．36°B．45°C．60°D．90°6．如图，△ABC中，AC＝AD＝BD，∠DAC＝40°，则∠B的度数是（）A．35°B．30°C．25°D．20°7．（x2）3可以表示为（）A．3x2B．x2C．x2+x2+x2D．x2•x2•x28．如图，△ABC的三边AB，BC，CA长分别是20，30，40，其三条角平分线将△ABC分为三个三角形，则S△ABO：S△BCO：S△CAO等于（）A．1：1：1 B．1：2：3 C．2：3：4 D．3：4：59．如图，在△ABC中，∠C＝90°，∠B＝30°，以A为圆心，任意长为半径画弧分别交AB、AC于点M和N，再分别以M、N为圆心，大于MN的长为半径画弧，两弧交于点P，连结AP并延长交BC于点D，则下列说法中正确的个数是（）①AD是∠BAC的平分线；②∠ADC＝60°；③点D在AB的中垂线上．A．1 B．2 C．3 D．410．如图，△ABC中，∠ABC＝45°，CD⊥AB于D，BE平分∠ABC，且BE⊥AC于E，与CD 相交于点F，DH⊥BC于H，交BE于G，下列结论：①BD＝CD；②AD+CF＝BD；③CE＝BF；④AE＝BG．其中正确的是（）A．①②B．①③C．①②③D．①②③④二．填空题（共6小题）11．计算：①a•a2＝；②（x3）2＝；③a0＝（a≠0）；④（﹣2b）2＝；⑤﹣6a÷3a＝；⑥（0.25）2020•（﹣4）2019＝；⑦（2a﹣b）（a+b）＝；⑧（10x2﹣5x）÷（﹣5x）＝．12．某多边形的内角和与外角和相等，这个多边形的边数是．13．如图，D是BC的中点，E是AC的中点．S△ADE＝2，则S△ABC＝．14．x m＝3，x n＝2，则x2m﹣3n＝．15．将等边三角形、正方形、正五边形按如图所示的位置摆放，如果∠1＝41°，∠2＝51°，那么∠3的度数等于．16．△ABC中，AB＝AC＝12厘米，∠B＝∠C，BC＝8厘米，点D为AB的中点．如果点P在线段BC上以2厘米/秒的速度由B点向C点运动，同时，点Q在线段CA上由C点向A 点运动．若点Q的运动速度为v厘米/秒，则当△BPD与△CQP全等时，v的值为．三．解答题（共10小题）17．求值：x2（x﹣1）﹣x（x2+x﹣1），其中x＝﹣．18．如图，PC⊥OA，PD⊥OB且OC＝OD，求证：∠1＝∠2．19．如图，△ABC的顶点坐标为A（0，﹣2）、B（3，﹣1）、C（2，1）．（1）请在图中画出△ABC关于y轴对称的图形△AB′C′；（2）在y轴上找一点P，使PB+PC的值最小．（在坐标系中标出点P）20．如图，Rt△ABC中，∠C＝90°，∠A＝30°．（1）用尺规作∠ABC的平分线交AC于点D（保留作图痕迹，不写作法）；（2）在（1）的前提下，若AD＝10，求CD的长度．21．如图，△ABC中，∠ACB＝90°，将△ABC沿着一条直线折叠后，使点A与点C重合（如图②）（1）在图①中画出折痕所在的直线l，问直线l是线段AC的线；（2）设直线l与AB、AC分别相交于点M、N，连结CM，若△CMB的周长是21cm，AB＝14cm，求BC的长．22．已知：如图，锐角△ABC的两条高BD、CE相交于点O，且OB＝OC．求证：△ABC是等腰三角形．23．如图，已知∠AOB＝60°，点P在边OA上，点M、N在边OB上．（1）若∠PNO＝60°，证明△PON是等边三角形；（2）若PM＝PN，OP＝12，MN＝2，求OM的长度．24．新定义：如图（1）和图（2）中，点P是平面内一点，如果＝2或＝，称点P 是线段AB的强弱点．（1）如图2，在Rt△APB中，∠APB＝90°，∠A＝30°，问：点B是否是线段AP的强弱点？请说明理由；（2）如图3，在Rt△ABC中，∠ACB＝90°，B是线段AC的强弱点（BA＞BC），BD是Rt △ABC的角平分线，求证：点D是线段AC上的强弱点．25．如图，在△ABC中，AB＝AC＝2，∠B＝∠C＝50°，点D在线段BC上运动（点D不与B、C重合），连结AD，作∠ADE＝50°，DE交线段AC于点E．（1）若DC＝2，求证：△ABD≌△DCE；（2）在点D的运动过程中，△ADE的形状可以是等腰三角形吗？若可以，请求出∠BDA 的度数；若不可以，请说明理由．26．如图，数学老师布置了这样一道作业题：在△ABC中，AB＝AC≠BC，点D和点A在直线BC的同侧．BD＝BC，∠BAC＝α，∠DBC＝β，α+β＝120°，连接AD，求∠ADB的度数．小聪提供了研究：先从特殊问题开始研究：当α＝90°，β＝30°时，利用轴对称知识，以AB为对称轴构造△ABD的轴对称图形△ABD′，连接CD′，然后利用α＝90°，β＝30°以及等边三角形的相关知识可解决这个问题．（1）请结合小聪研究，画出当α＝90°，β＝30°时相应的图形；（2）请结合小聪研究，求出当α＝90°，β＝30°时∠ADB的图形；（3）请结合小聪研究，请解决数学老师布置的这道作业题参考答案与试题解析一．选择题（共10小题）1．下列国产车标属于轴对称图形的是（）A．B．C．D．【分析】根据轴对称图形的概念求解．【解答】解：A、是轴对称图形，故正确；B、不是轴对称图形，故错误；C、不是轴对称图形，故错误；D、不是轴对称图形，故错误．故选：A．2．下列四个图形中，线段BE是△ABC的高的是（）A．B．C．D．【分析】根据三角形高的画法知，过点B作AC边上的高，垂足为E，其中线段BE是△ABC的高，再结合图形进行判断．【解答】解：线段BE是△ABC的高的图是选项D．故选：D．3．（2a）2的计算结果是（）A．4a2B．2a2C．4a D．4a4【分析】直接利用积的乘方运算法则计算得出答案．【解答】解：（2a）2＝4a2．故选：A．4．点（3，﹣2）关于x轴的对称点是（）A．（﹣3，﹣2）B．（3，2）C．（﹣3，2）D．（3，﹣2）【分析】熟悉：平面直角坐标系中任意一点P（x，y），关于x轴的对称点的坐标是（x，﹣y）．【解答】解：根据轴对称的性质，得点（3，﹣2）关于x轴的对称点是（3，2）．故选：B．5．△ABC中，AB＝AC，∠A＝∠C，则∠B＝（）A．36°B．45°C．60°D．90°【分析】证明三角形是等边三角形即可解决问题．【解答】解：∵AB＝AC，∴∠B＝∠C，∵∠A＝∠C，∴∠A＝∠B＝∠C＝60°，故选：C．6．如图，△ABC中，AC＝AD＝BD，∠DAC＝40°，则∠B的度数是（）A．35°B．30°C．25°D．20°【分析】先根据等腰三角形的性质及三角形内角和定理求出∠ADC的度数，再根据等腰三角形的性质及三角形外角与内角的关系求出∠B的度数即可．【解答】解：∵△ABC中，AC＝AD，∠DAC＝40°，∴∠ADC＝＝70°，∵AD＝BD，∠ADC＝∠B+∠BAD＝70°，∴∠B＝∠BAD＝（）°＝35°．故选：A．7．（x2）3可以表示为（）A．3x2B．x2C．x2+x2+x2D．x2•x2•x2【分析】直接利用同底数幂的乘除运算法则判断得出答案．【解答】解：（x2）3可以表示为：x2•x2•x2．故选：D．8．如图，△ABC的三边AB，BC，CA长分别是20，30，40，其三条角平分线将△ABC分为三个三角形，则S△ABO：S△BCO：S△CAO等于（）A．1：1：1 B．1：2：3 C．2：3：4 D．3：4：5【分析】利用角平分线上的一点到角两边的距离相等的性质，可知三个三角形高相等，底分别是20，30，40，所以面积之比就是2：3：4．【解答】解：过点O作OD⊥AC于D，OE⊥AB于E，OF⊥BC于F，∵点O是内心，∴OE＝OF＝OD，∴S△ABO：S△BCO：S△CAO＝•AB•OE：•BC•OF：•AC•OD＝AB：BC：AC＝2：3：4，故选：C．9．如图，在△ABC中，∠C＝90°，∠B＝30°，以A为圆心，任意长为半径画弧分别交AB、AC于点M和N，再分别以M、N为圆心，大于MN的长为半径画弧，两弧交于点P，连结AP并延长交BC于点D，则下列说法中正确的个数是（）①AD是∠BAC的平分线；②∠ADC＝60°；③点D在AB的中垂线上．A．1 B．2 C．3 D．4【分析】根据角平分线的做法可得①正确，再根据三角形内角和定理和外角与内角的关系可得∠ADC＝60°，再根据线段垂直平分线的性质逆定理可得③正确．【解答】解：①AD是∠BAC的平分线，说法正确；②∵∠C＝90°，∠B＝30°，∴∠CAB＝60°，∵AD平分∠CAB，∴∠DAB＝30°，∴∠ADC＝30°+30°＝60°，因此∠ADC＝60°正确；③∵∠DAB＝30°，∠B＝30°，∴AD＝BD，∴点D在AB的中垂线上，故③说法正确，故选：C．10．如图，△ABC中，∠ABC＝45°，CD⊥AB于D，BE平分∠ABC，且BE⊥AC于E，与CD 相交于点F，DH⊥BC于H，交BE于G，下列结论：①BD＝CD；②AD+CF＝BD；③CE＝BF；④AE＝BG．其中正确的是（）A．①②B．①③C．①②③D．①②③④【分析】根据∠ABC＝45°，CD⊥AB可得出BD＝CD，利用AAS判定Rt△DFB≌Rt△DAC，从而得出DF＝AD，BF＝AC．则CD＝CF+AD，即AD+CF＝BD；再利用AAS判定Rt△BEA≌Rt △BEC，得出CE＝AE＝AC，又因为BF＝AC所以CE＝AC＝BF，连接CG．因为△BCD是等腰直角三角形，即BD＝CD．又因为DH⊥BC，那么DH垂直平分BC．即BG＝CG．在Rt△CEG中，CG是斜边，CE是直角边，所以CE＜CG．即AE＜BG．【解答】解：∵CD⊥AB，∠ABC＝45°，∴△BCD是等腰直角三角形．∴BD＝CD．故①正确；在Rt△DFB和Rt△DAC中，∵∠DBF＝90°﹣∠BFD，∠DCA＝90°﹣∠EFC，且∠BFD＝∠EFC，∴∠DBF＝∠DCA．又∵∠BDF＝∠CDA＝90°，BD＝CD，∴△DFB≌△DAC．∴BF＝AC；DF＝AD．∵CD＝CF+DF，∴AD+CF＝BD；故②正确；在Rt△BEA和Rt△BEC中∵BE平分∠ABC，∴∠ABE＝∠CBE．又∵BE＝BE，∠BEA＝∠BEC＝90°，∴Rt△BEA≌Rt△BEC．∴CE＝AE＝AC．又由（1），知BF＝AC，∴CE＝AC＝BF；故③正确；连接CG．∵△BCD是等腰直角三角形，∴BD＝CD又DH⊥BC，∴DH垂直平分BC．∴BG＝CG在Rt△CEG中，∵CG是斜边，CE是直角边，∴CE＜CG．∵CE＝AE，∴AE＜BG．故④错误．故选：C．二．填空题（共6小题）11．计算：①a•a2＝a3；②（x3）2＝x6；③a0＝ 1 （a≠0）；④（﹣2b）2＝4b2；⑤﹣6a÷3a＝﹣2 ；⑥（0.25）2020•（﹣4）2019＝﹣0.25 ；⑦（2a﹣b）（a+b）＝2a2+ab﹣b2；⑧（10x2﹣5x）÷（﹣5x）＝﹣2x+1 ．【分析】①直接利用同底数幂的乘法运算法则计算得出答案；②直接利用幂的乘方运算法则计算得出答案；③直接利用零指数幂的性质计算得出答案；④直接利用积的乘方运算法则计算得出答案；⑤直接利用整式的除法运算法则计算得出答案；⑥直接利用积的乘方运算法则计算得出答案；⑦直接利用多项式乘法运算法则计算得出答案；⑧直接利用整式的除法运算法则计算得出答案．【解答】解：：①a•a2＝a3；②（x3）2＝x6；③a0＝1（a≠0）；④（﹣2b）2＝4b2；⑤﹣6a÷3a＝﹣2；⑥（0.25）2020•（﹣4）2019＝﹣0.25；⑦（2a﹣b）（a+b）＝2a2+ab﹣b2；⑧（10x2﹣5x）÷（﹣5x）＝﹣2x+1．故答案为：①a3；②x6；③1；④4b2；⑤﹣2；⑥﹣0.25；⑦2a2+ab﹣b2；⑧﹣2x+1．12．某多边形的内角和与外角和相等，这个多边形的边数是四．【分析】根据多边形的内角和公式与外角和定理列式进行计算即可求解．【解答】解：设这个多边形是n边形，则（n﹣2）•180°＝360°，解得n＝4．故答案为：四．13．如图，D是BC的中点，E是AC的中点．S△ADE＝2，则S△ABC＝8 ．【分析】根据三角形的中线将三角形分成面积相等的两个三角形先求出△ACD的面积，再求解即可．【解答】解：∵E是AC的中点，∴S△ACD＝2S△ADE＝2×2＝4，∵D是BC的中点，∴S△ABC＝2S△ACD＝2×4＝8．故答案为：8．14．x m＝3，x n＝2，则x2m﹣3n＝．【分析】依据同底数幂的除法法则以及幂的乘方法则，即可得到结论．【解答】解：∵x m＝3，x n＝2，∴x2m﹣3n＝x2m÷x3n＝（x m）2÷（x n）3＝9÷8＝，故答案为：．15．将等边三角形、正方形、正五边形按如图所示的位置摆放，如果∠1＝41°，∠2＝51°，那么∠3的度数等于10°．【分析】利用360°减去等边三角形的一个内角的度数，减去正方形的一个内角的度数，减去正五边形的一个内角的度数，然后减去∠1和∠2即可求得．【解答】解：等边三角形的内角的度数是60°，正方形的内角度数是90°，正五边形的内角的度数是：（5﹣2）×180°＝108°，则∠3＝360°﹣60°﹣90°﹣108°﹣∠1﹣∠2＝10°．故答案是：10°．16．△ABC中，AB＝AC＝12厘米，∠B＝∠C，BC＝8厘米，点D为AB的中点．如果点P在线段BC上以2厘米/秒的速度由B点向C点运动，同时，点Q在线段CA上由C点向A 点运动．若点Q的运动速度为v厘米/秒，则当△BPD与△CQP全等时，v的值为2或3 ．【分析】此题要分两种情况：①当BD＝PC时，△BPD与△CQP全等，计算出BP的长，进而可得运动时间，然后再求v；②当BD＝CQ时，△BDP≌△QCP，计算出BP的长，进而可得运动时间，然后再求v．【解答】解：当BD＝PC时，△BPD与△CQP全等，∵点D为AB的中点，∴BD＝AB＝6cm，∵BD＝PC，∴BP＝8﹣6＝2（cm），∵点P在线段BC上以2厘米/秒的速度由B点向C点运动，∴运动时间时1s，∵△DBP≌△PCQ，∴BP＝CQ＝2cm，∴v＝2÷1＝2；当BD＝CQ时，△BDP≌△QCP，∵BD＝6cm，PB＝PC，∴QC＝6cm，∵BC＝8cm，∴BP＝4cm，∴运动时间为4÷2＝2（s），∴v＝6÷2＝3（m/s），故答案为：2或3．三．解答题（共10小题）17．求值：x2（x﹣1）﹣x（x2+x﹣1），其中x＝﹣．【分析】先去括号，再合并同类项，最后把x＝﹣代入求出即可．【解答】解：x2（x﹣1）﹣x（x2+x﹣1），＝﹣2x2+x＝x（﹣2x+1），当x＝﹣时，原式＝﹣×[﹣2×（﹣）+1]＝﹣1．18．如图，PC⊥OA，PD⊥OB且OC＝OD，求证：∠1＝∠2．【分析】利用“HL”证明Rt△POC和Rt△POD全等，根据全等三角形的性质即可得出结论．【解答】证明：∵PC⊥OA，PD⊥OB，∴∠PCO＝∠PDO＝90°，在Rt△POC和Rt△POD中，，∴Rt△POC≌Rt△POD（HL），∴∠1＝∠2．19．如图，△ABC的顶点坐标为A（0，﹣2）、B（3，﹣1）、C（2，1）．（1）请在图中画出△ABC关于y轴对称的图形△AB′C′；（2）在y轴上找一点P，使PB+PC的值最小．（在坐标系中标出点P）【分析】（1）依据轴对称的性质，即可得到△ABC关于y轴对称的图形△AB′C′；（2）连接BC'，交y轴于点P，依据两点之间，线段最短，即可得到PB+PC的值最小．【解答】解：（1）如图所示，△AB′C′即为所求；（2）如图所示，连接BC'，交y轴于点P，则PB+PC的值最小．20．如图，Rt△ABC中，∠C＝90°，∠A＝30°．（1）用尺规作∠ABC的平分线交AC于点D（保留作图痕迹，不写作法）；（2）在（1）的前提下，若AD＝10，求CD的长度．【分析】（1）用尺规作∠ABC的平分线交AC于点D即可；（2）在（1）的前提下，根据角平分线的性质和30度角所对直角边等于斜边一半，AD ＝10，即可求CD的长度．【解答】解：（1）如图所示：BD即为所求作的图形．（2）如图，作DE⊥AB于点E，∵∠C＝90°，∴DC⊥BC，∵BD平分∠CBA，∴DC＝DE，∵∠A＝30°，AD＝10，∴DE＝AD＝5，∴CD＝5．答：CD的长度为5．21．如图，△ABC中，∠ACB＝90°，将△ABC沿着一条直线折叠后，使点A与点C重合（如图②）（1）在图①中画出折痕所在的直线l，问直线l是线段AC的中垂线；（2）设直线l与AB、AC分别相交于点M、N，连结CM，若△CMB的周长是21cm，AB＝14cm，求BC的长．【分析】（1）由折叠的性质可得AN＝NC，∠ANM＝∠CNM＝90°，即直线l是线段AC的中垂线；（2）由折叠的性质可得AM＝CM，即可求BC的长．【解答】解：（1）如图①，∵将△ABC沿着一条直线折叠后，使点A与点C重合，∴AN＝NC，∠ANM＝∠CNM＝90°，∴直线l是线段AC的中垂线，故答案为：中垂；（2）∵将△ABC沿着一条直线折叠后，使点A与点C重合，∴AM＝CM，∵△CMB的周长是21cm，AB＝14cm，∴21＝CM+BM+BC＝AM+BM+CB＝AB+BC＝14+BC，∴BC＝7cm．22．已知：如图，锐角△ABC的两条高BD、CE相交于点O，且OB＝OC．求证：△ABC是等腰三角形．【分析】由OB＝OC，即可求得∠OBC＝∠OCB，又由，锐角△ABC的两条高BD、CE相交于点O，根据三角形的内角和等于180°，即可证得△ABC是等腰三角形．【解答】证明：∵OB＝OC，∴∠OBC＝∠OCB，∵锐角△ABC的两条高BD、CE相交于点O，∴∠BEC＝∠CDB＝90°，∵∠BEC+∠BCE+∠ABC＝∠CDB+∠DBC+∠ACB＝180°，∴180°﹣∠BEC﹣∠BCE＝180°﹣∠CDB﹣∠CBD，∴∠ABC＝∠ACB，∴AB＝AC，∴△ABC是等腰三角形；23．如图，已知∠AOB＝60°，点P在边OA上，点M、N在边OB上．（1）若∠PNO＝60°，证明△PON是等边三角形；（2）若PM＝PN，OP＝12，MN＝2，求OM的长度．【分析】（1）三个角都相等的三角形是等边三角形．（2）作PH⊥MN于H，依据等腰三角形的性质以及含30°角的直角三角形的性质，即可得到OM的长度．【解答】解：（1）∵∠AOB＝60°，∠PNO＝60°，∴∠OPN＝60°，∴∠PON＝∠PNO＝∠OPN，∴△PON是等边三角形；（2）作PH⊥MN于H，如图，∵PM＝PN，∴MH＝NH＝MN＝1，在Rt△POH中，∵∠POH＝60°，∴∠OPH＝30°，∴OH＝OP＝×12＝6，∴OM＝OH﹣MH＝6﹣1＝5．24．新定义：如图（1）和图（2）中，点P是平面内一点，如果＝2或＝，称点P 是线段AB的强弱点．（1）如图2，在Rt△APB中，∠APB＝90°，∠A＝30°，问：点B是否是线段AP的强弱点？请说明理由；（2）如图3，在Rt△ABC中，∠ACB＝90°，B是线段AC的强弱点（BA＞BC），BD是Rt △ABC的角平分线，求证：点D是线段AC上的强弱点．【分析】（1）在Rt△PAB中，根据直角三角形30度角的性质得：AB和PB的关系，由新定义即可解决问题；（2）如图3中，由B是线段AC的强弱点（BA＞BC），推出AB＝2BC，可得∠A＝30°，根据角平分线的定义和等腰三角形的判定，直角三角形30度角的性质可得AD＝2CD，解决问题；【解答】（1）解：点B是线段AP的强弱点，理由是：如图2中，在Rt△PAB中，∠APB＝90°，∠A＝30°，∴AB＝2PB，∴＝2，∴点B是线段AP的强弱点；（2）证明：如图3中，∵B是线段AC的强弱点（BA＞BC），∴AB＝2BC，Rt△ACB中，∠A＝30°，∠ABC＝60°，∵BD平分∠ABC，∴∠ABD＝∠CBD＝30°＝∠A，∴AD＝BD，Rt△BCD中，BD＝2CD，∴＝2，∴点D是线段AC上的强弱点．25．如图，在△ABC中，AB＝AC＝2，∠B＝∠C＝50°，点D在线段BC上运动（点D不与B、C重合），连结AD，作∠ADE＝50°，DE交线段AC于点E．（1）若DC＝2，求证：△ABD≌△DCE；（2）在点D的运动过程中，△ADE的形状可以是等腰三角形吗？若可以，请求出∠BDA 的度数；若不可以，请说明理由．【分析】（1）利用∠DEC+∠EDC＝130°，∠ADB+∠EDC＝130°，求出∠ADB＝∠DEC，再利用AB＝DC＝2，即可得出△ABD≌△DCE．（2）分两种情况进行讨论，根据三角形的外角性质，可得当∠BDA的度数为115°或100°时，△ADE的形状是等腰三角形；【解答】（1）证明：∵AB＝AC＝2，DC＝2，∴AB＝DC，∵∠B＝∠C＝50°，∠ADE＝50°，∴∠BDA+∠CDE＝130°，∠CED+∠CDE＝130°，∴∠BDA＝∠CED，∴△ABD≌△DCE（AAS）（2）解：可以．有以下三种可能：①由（1）得：△ABD≌△DCE，得AD＝DE则有∠DAE＝∠DEA＝65°∴∠BDA＝∠CED＝65°+50°＝115°；②由（1）得∠BDA＝∠CED∵点D在线段BC上运动（点D不与B、C重合）∴AD≠AE；③当EA＝ED时，∠EAD＝∠ADE＝50°∴∠BDA＝∠CED＝50°+50°＝100°．26．如图，数学老师布置了这样一道作业题：在△ABC中，AB＝AC≠BC，点D和点A在直线BC的同侧．BD＝BC，∠BAC＝α，∠DBC＝β，α+β＝120°，连接AD，求∠ADB的度数．小聪提供了研究：先从特殊问题开始研究：当α＝90°，β＝30°时，利用轴对称知识，以AB为对称轴构造△ABD的轴对称图形△ABD′，连接CD′，然后利用α＝90°，β＝30°以及等边三角形的相关知识可解决这个问题．（1）请结合小聪研究，画出当α＝90°，β＝30°时相应的图形；（2）请结合小聪研究，求出当α＝90°，β＝30°时∠ADB的图形；（3）请结合小聪研究，请解决数学老师布置的这道作业题【分析】（1）根据题意作出图形即可；（2）作辅助线构建全等三角形，证明△ABD≌△ABD′得△BD′C是等边三角形，再证明△AD′B≌△AD′C得∠AD′B＝∠BD′C＝30°，则∠ADB＝∠AD′B＝30°；（3）分两种情况进行讨论：第一种情况：当60°＜α≤120°时，利用全等先求∠ABC 和∠ABD的度数，从而得∠ABD′和∠D′BC的度数，得到△BD′C是等边三角形，根据（1）同理得出∠ADB＝∠AD′B＝30°；第二种情况：当0°＜α＜60°时，仍然按此过程求出∠ADB＝∠AD′B＝150°．【解答】解：（1）如图1，（2）如图2，作∠AB D′＝∠ABD，B D′＝BD，连接CD′，AD′，∵AB＝AC，∠BAC＝90°，∴∠ABC＝45°，∵∠DBC＝30°，∴∠ABD＝∠ABC﹣∠DBC＝15°，∵AB＝AB，∠AB D′＝∠ABD，B D′＝BD，∴△ABD≌△ABD′（SAS），∴∠ABD＝∠ABD′＝15°，∠ADB＝∠AD′B，∴∠D′BC＝∠ABD′+∠ABC＝60°，∵BD＝BD′，BD＝BC，∴BD′＝BC，∴△D′BC是等边三角形，∴D′B＝D′C，∠BD′C＝60°，∵AB＝AC，AD'＝AD'，∴△AD′B≌△AD′C，∴∠AD′B＝∠AD′C，∴∠AD′B＝∠BD′C＝30°，∴∠ADB＝30°，（3）解：第一种情况：当60°＜α≤120°时，如图2，作∠AB D′＝∠ABD，B D′＝BD，连接CD′，AD′，∵AB＝AC，∴∠ABC＝∠ACB，∵∠BAC＝α，∴∠ABC＝＝90°﹣，∴∠ABD＝∠ABC﹣∠DBC＝90°﹣﹣β，同（1）可证△ABD≌△ABD′，∴∠ABD＝∠ABD′＝90°﹣﹣β，BD＝BD′，∠ADB＝∠AD′B∴∠D′BC＝∠ABD′+∠ABC＝90°﹣＝180°﹣（α+β），∵α+β＝120°，∴∠D′BC＝60°，以下同（1）可求得∠ADB＝30°，第二种情况：当0°＜α＜60°时，如图3，作∠AB D′＝∠ABD，B D′＝BD，连接CD′，AD′．同理可得：∠ABC＝，∴∠ABD＝∠DBC﹣∠ABC＝，同（1）可证△ABD≌△ABD′，∴∠ABD＝∠ABD′═，，BD＝BD′，∠ADB＝∠AD′B，∴∠D′BC＝∠ABC﹣∠ABD′＝90°﹣，∴D′B＝D′C，∠BD′C＝60°．同（1）可证△AD′B≌△AD′C，∴∠AD′B＝∠AD′C，∵∠AD′B+∠AD′C+∠BD′C＝360°，∴∠ADB＝∠AD′B＝150°．。

福建省厦门市同安一中2019-2020学年八年级上学期英语期中考

同安一中2019-2020学年上学期期中考(二)基础知识与运用Ⅱ.单项选择填空:从A、B、C三个选项中选出一个最佳选项完成句子。

(共15分,每小题1分)( )16.There is ____ university in Xiamen, it's very famous.A.anB.theC.a( )17.Town Cinema is one of _____ in townA.the best cinemaB. the better cinemasC. the best cinemas( )18. Our math teacher was ill yesterday, so Mr. Li took ______.A. his placeB. him workC. he's place( )19. You need to read today,'s newspaper because it is _______.A.enough interestingB. nothing interestingC. interesting enough ( )20. Mr Bean enjoys _______ jokes and often makes us ______.A. telling, to laughB. tells, laughC. telling, laugh( )21. _____ he is very young, _______ he can do many things.A.Though, butB.Though, /C. But, though( )22.There _____ a new and big park in our town, we can't wait.A.will haveB. are going to beC. is going to be( )23. John likes music, he is going to ______ soon.A. take up singingB. dislike singingC. have to sing( )24. John said he would come to my party, but he didn't _____.A.happenB.appearC. leave( )25. Can you give me ______ try, I'll do it better.A. anotherB. the otherC.others( )26.The words are very useful, please _____.A.put down themB.writedown itC. write them down( )27.Jack studies _____than Tom, but Tom is _____ than Jack and he has a lot of friends.A.harder, friendlyB.harder; friendlierC. hardly; friendlier( )28.--What do you think of the news?--I think _____ important.A.it’sB.they’reC. its( )29. “Success never seems to come but ____ hard work,”the teacher said to the boy.A. belowB. acrossC. through( )30.She has many hobbies, _____ running,singing and more.A. for exampleB. likesC. such asⅢ.完形填空:从A、B、C、D四个选项中,选择一个最佳答案填空,使短文意思完整。

厦门市同安区八年级2019-2020学年上学期物理期中考试试卷

厦门市同安区八年级2019-2020学年上学期物理期中考试试卷姓名:________ 班级:________ 成绩:________一、选择题（每小题3分，共36分．每小题只有一个选项是最符合题目 (共12题；共34分)1. （3分）下列说法最接近实际情况的是（）A . 初二年级学生的平均质量约为55kgB . 雪的密度大于C . 按照交通部门规定，重庆市内环快速路的最高限速为120m/sD . 这张试卷的厚度大约为2nm2. （3分）(2012·来宾) 坐在行驶的船中的乘客，我们说他静止，选择的参照物是（）A . 河水B . 船舱C . 河岸上的树D . 迎面驶来的船3. （2分） (2016八·合江月考) 对作匀速直线运动的物体，下列判断错误的是（）A . 由s=vt可知，运动的路程与所花的时间成正比B . 的比值越小，表明物体运动得越慢C . 由v= 可知，速度与路程成正比，与时间成反比D . 的比值越大，表明物体运动得越快4. （3分） (2018九上·黑龙江期中) 在百米赛跑终点的计时员，如果在听到枪声后才开始计时，那么，他开始计时的时间比运动员起跑的时间晚（）秒（V声=340米/秒）．A . 0.3B . 3.0C . 30D . 3005. （3分） (2017八上·长春月考) 用力敲铜锣，铜锣发出声音，停止敲击，铜锣"余音未止"，用手按住锣面，锣声消失了，手开始有点麻的感觉，下列说法中正确的是（）A . "余音未止"是回声的现象B . 有余音说明停止敲击，铜锣仍在振动C . 手感到"麻"与锣振动无关D . 锣声消失了，是手阻碍了声音的传播6. （2分）(2018·绵阳模拟) 关于声现象，下列说法中正确的是（）A . 物体不振动也可以发出声音B . 音调的高低与振幅有关C . 公路两旁安装隔音板是为了在声源处减弱噪声D . 利用超声波给金属工件探伤，说明声可以传递信息7. （3分） (2019八上·雅安期中) 下列关于声现象的说法中正确的是（）A . 医生利用超声波可击碎病人体内的结石，是因为声波能传递能量B . 声音在空气中比在水中传播的速度要大C . 广场舞噪音扰民是因为广场舞音调太髙D . 往暖瓶里灌水可以通过声音的音色来判断瓶中水位的高低8. （3分） (2018八上·含山期末) 关于声现象，下列说法正确的是（）A . 随着科技进步，物体不振动也能发声B . 声音从空气传入水中，音调、响度以及传播速度都不变C . 用超声波粉碎人体内的结石，说明超声波具有能量D . 中考期间，学校路段禁止汽车鸣笛，这是在传播过程中减弱噪声9. （3分）南极内陆年平均气温为-50℃左右，南极科考队使用酒精温度计而不是水银温度计，是由于酒精的（）A . 凝固点低B . 密度小C . 沸点低D . 比热容大10. （3分）室温是18℃。

厦门一中集美分校2019-2020学年第一学期期中测试--八年级(不含听力word无答案版)

厦门一中集美分校2019-2020学年度第一学期期中测试八年级英语试卷(满分: 150分考试时间: 100分钟)第一部分(选择题)Ⅱ. 语言知识运用(共两节，20小题，每小题1.5分，满分30分)第一节单项选择:从每小题所给的A、B、C三个选项中,选出可填入空白处的正确答案. (每小题1.5分,满分18分)16. She is talented music but I am good at sports.A.atB. inC. on17. -----do you read English newspapers?----- I read China Daily every day.A. How soonB. How oftenC. How long18. Molly is girl of the three.A. outgoingB. more outgoingC. the most outgoing19. A is a doctor who can take care of your teeth.A. performerB. dentistC. magician20. ----- Guess what! Teresa makes her own clothes.----- Wow, she is so . I could never do that.A. loudB. luckyC. creative21. they are sisters, they don’t look the same.A. ThoughB. BecauseC. But22. He his story, no one believed him then.A. made upB. felt likeC. brought out23. Helen was so excited at the news that she could say a word.A. everB. almostC. hardly24. ----- Jack, is there in today’s newspaper?----- No, nothing.A. anything importantB. something importantC. nothing important25. The peaceful music in the CD made the students relaxed.A. feelB. feltC. to feel26. ----- Who likes watching news?----- Greg does. He hopes about everything now.A. knowB. knowingC. to know27. ----- Shall we go to the movies right away or next week?-----. Any time will do.A. Have a good timeB. I’m afraid I can’tC. It’s up to you第二节完型填空:从每小题所给的A、B、C三个选项中,选出可填入空白处的最佳答案.(每小题1.5分,共12分)．I’m a middle school student. In the past, I had some bad 28 . I hardly had breakfast 29 I usually got up late. I didn’t like exercising. I only exercised one to two times a month. In the evening, I always watched TV 30 more than two hours. Then I 31 the internet. I liked to play computer games, so I often stayed up late. My parents thought staying up late was bad for my health, so they were not happy with that.One day, I fainted (昏倒) in a P.E. class. When I 32 , I was in the hospital. The doctor said that my classmates sent 33 there. He said that I was in poor 34 . Then he told me to eat breakfast every day and do more exercise.From then on, I 35 go give up (戒掉) my bad habits. Now I usually get up early and have a good breakfast. After school, I always play sports with my friends. It’s fun and good for my health.28.A. activities B. habits C. buildings29.A. although B. that C. because30.A. for B. after C. through31.A. waited B. used C. bought32.A. cut down B. thought of C. woke up33.A. me B. her C. him34.A. percent B. difference C. health35.A. asked B. decided C. stoppedⅢ.阅读理解（共两节，16小题，每小题2分，满分32分）第一节阅读下面A、B、C三篇短文, 根据短文内容，从题中所给的A、B、C三个选项中,选出最佳答案. (每小题2分,满分32分)．A36. What type is the show “Tokyo Love Story”?A. SitcomB. Sports showC. Soap opera37. Which program is Fashion Show?A. Romantic DreamB. Face To FaceC. China Sports38. Which channel has the show “Good Friend Contest”?A. ATVB. BTVC. CTV39. Which two shows begin at the same time?A. Face To Face and Romantic DreamB. Chinese Mother and Football MagazineC. Chinese Mother and Happy FamilyBHealthy eating doesn’t just mean what you eat, but how you eat. Here is some advice on healthy eating.Eat with others. It can help you to see others’ healthy eating habits. If you usually eat with your parents, you will find that the food you eat is more delicious.Listen to your body. Ask yourself if you are really hungry. Have a glass of water to see if you are thirsty---sometimes you are just thirsty, and you need no food. Stop eating before you feel full.Eat breakfast. Breakfast is the most important meal of the day. After you don’t eat for the past ten hours, our body needs food to get you going. You will be smarter after eating breakfast.Eat healthy snacks (零食) like fruits, yogurt or cheese. We all need snacks sometimes. In fact, it’s a good idea to eat two healthy snacks between your three meals. This doesn’t mean that you can eat a bag of chips instead of a meal.Don’t eat dinner late. With our busy life, we always put off (推迟) eating dinner until the last minute. Try to eat dinner at least 3 hours before you go to bed. This will give your body a chance to digest most of the food before you rest for the next 8-10 hours.40. The massage mainly tells us .A. where to eatB. how to eatC. why to eat41. Which snack is not mentioned in the passage?A. Cakes.B. Yogurt.C. Chips.42. The underlined word “digest” means “ ” in Chinese.A. 消化B. 享用C. 储存43. Which of the following is TRUE according to the passage?A. Snacks are bad for our health.B. Dinner is the most important meal of the day.C. We should have dinner at least 3 hours before going to bed.CMr. Smith works in an office. He’s very busy and has no time to have a good rest. Every evening, when he comes from his office, he’s always tired and wants to go to bed early. But his wife often has a lot of interesting things to tell him after supper. She doesn’t stop talking until she goes to bed.One morning the man felt terrible and couldn’t go to work. He decided to go to see a doctor. And Mrs. Smith went to the hospital with him. Before her husband said what was the matter with him, the woman told the doctor all the things. The doctor understood why and said to Mrs. Smith, “The bottle of medicine is for your husband and the pills (药片) are for you.”“For me?” the woman said in surprise, “I’m fine. I don’t need any medicine!” “I don’t think so, madam,” said the doctor, “They are sleeping pills, your husband will soon be all right if you take them.”44. Mr. Smith can’t have a good rest because .A. he is illB. his wife is very busyC. he is very busy and has no time45. Why did Mr. Smith feel terrible one morning?A. Because he couldn’t sleep well.B. Because he had to go to work.C. Because his wife asked him to get up.46. The doctor gave Mrs. Smith some medicine .A. to make her happyB. to let her sleep quicklyC. to make her get better47. The sentence “Your husband will soon be all right if you take them.” Means Mr. Smith will soon be all rightif .A. Mrs. Smith takes the bottle of medicineB. Mrs. Smith takes the pillsC. Mrs. Smith stops talking too much at night第二部分(非选择题)(四)情景交际运用(满分20分)第二节阅读D篇短文，完成表格，每空不超过三个词。

厦门九中2019-2020年第一学期八年级期中考试卷-英语试卷 (无听力部分,无答案)

厦门九中2019-2020年度八年级上期中考试卷Ⅱ.语言知识应用（共两节,共20小题,每小题15分,满分33分）第一节单项选择从每小题所给的A、B、C三个选项中，选出可以填入空白处的正确答案。

(每小题1.5分,共18分)16. I went to Shanghai to visit my grandparents Juy16th,2019.A. atB. inC. on17. Mary has such a good voice that she won many in the singing competitions last year.A. rulesB. prizesC. reasons18 -Morning, class. Is here today?-No sir, Tom is ill at homeA. somebodyB. anybodyC. everybody19. -Do you often go to KFC?-Oh, no. I go to KFC. I hate junk food.A. feelingB. hardlyC. sometimes20. In our classroom, we are all friendly to each other. It makes us like a big family.A feeling B. feel C. to feel21. -What did you do last weekend?-I wanted to go to the beach with my friend , it rained, so I stayed at home.A. HoweverB. ThoughC. Maybe22.- do you go to the school library?-Three or four times a monthA. How long B How often C. How far23. -Do you like this sofa, Mrs. Brown?-Of course. It's not expensive and I can sit on it.A carefully B. comfortable C. seriously24. I will help you with your homework you help me with the housework.A. as long asB. such asC. so far25. -Do you plan to watch The Voice of China tonight?-Of course .I can’t wait to who will win.A. think of B come out C. find out26. It is one of books I know.A. more interesting B the most interesting C the most interested27 -Thanks for taking my friends and me out tonight.- .A. You are welcomeB. Don’t worry.C. That’s a good idea.第二节完形填空从每小题所给的A、B、C三个选项中,选出可以填入空白处的最佳答案(每小题15分,满分15分)Can you cut an apple with a playing card? Can you write with one hand and draw with 28 ? Well, some people can, and they all show their 29 talents on the television program, China's Got Talent.The TV program is getting more and more 30 in China. Many people watch it every week 31 they wonder how talented one can be.Talent shows 32 in Britain. And now there are similar shows in lots of countries 33 the world. China's Got Talent is the newest, but it 34 others. When people show their special talents, they also 35 their most touching or funniest stories, Most of them don't want to be famous. They 36 want to make their family laugh and want to make others laugh, tooWe all have a 37 . It may be big or small. What's your talent? Ma ybe you can be the next star on China’s Got Talent!28. A. other B. others C. the other29. A. serious B. scary C. special30. A popular B. necessary C .important31. A. though B. because C. but32. A. began B. died C. reached33. A. with B. to C. around34. A. is similar to B. is different from C. is the same as35. A. enjoy B. write C. share36. A. still B. just C. ever37.A. talent B. family C. roleⅢ.阅读理解 (共两节，共16小题，每小题2分，满分32分)第一节阅读下面A、B、C三篇短文，根据短文内容，从题中所给A、B、C四个选项中,选出最佳答案。

2019-2020上学期福建省厦门市八年级语文期中考试试卷.pdf

厦门市湖里实验中学2019—2020学年第一学期期中考试卷八年级语文一积累与运用(20分)1.古诗文默写(10分)(1) ，猎马带禽归。

(王绩《野望》)(2)经纶世务者, 。

(吴均《与朱元思书》)(3)月下飞天镜，。

(李白《渡荆门送别》)(4) ，志在千里。

(曹操《龟虽寿》)(5)晴川历历汉阳树，。

(崔颢《黄鹤楼》)(6)最爱湖东行不足，。

(白居易《钱塘湖舂行》)(7)至于，沿溯阻绝。

(郦道元《三峡》)(8)自康乐以来，。

(陶弘景《答谢中书书》)(9) 王维的《使至塞上》以传神的笔墨，刻画奇特壮美沙漠景象的两句诗是:，。

2.下列文学常识说法不正确的一项是( ) (2 分)A.《野望》《使至塞上》《钱塘湖春行》《黄鹤楼》都是唐诗，且都是律诗。

B.《答谢中书书》中的“书”和《与朱元思书》中的“书”都是指古代的书信。

C. 新闻五结构包括:标题、电头、导语、主体、结语。

其中标题、导语、主体是主要部分。

D.《从百草园到三味书屋》和《藤野先生》都出自鲁迅的散文集《朝花夕拾》这本书。

3.下列句子没有语病的一句是( )(2分)A.语言流畅是衡量文章好坏的重要标准之一。

B.我们要认真克服并随时发现自己的缺点。

C.在老师和同学们的帮助下，使他的成绩有了很大的进步。

D.只有坚持不懈地刻苦努力，才能取得优异的成绩。

4.阅读下面语段，按要求作答。

(6 分)《朗读者》精心挑选经典美文，用最平实的情感读出文字背后的价值，旨在实现感染人、鼓舞人、教育人，展现真实的人物情感。

节目呈现生命之美、文学之美和情感之美，它所传递的责任感、温情符合中国人的传统价值理念。

其①mèi力并不仅仅在于朗读本身，嘉宾分享的故事同样精彩。

这些简单的过往经历，却有着深刻的【甲】(底蕴内涵) 或动人的情感在里面。

茅盾文学奖得主麦家在节目中畅谈与儿子之间的矛盾、分歧、,②隔hé乃至冲突，与观众【乙】(分享共享) 对儿子的教育心得及父子间的相处之道，令人感慨。

[名校联盟]福建省厦门一中2019—2020学年度初二上学期期中考试物理试卷doc初中物理

［名校联盟］福建省厦门一中2019—2020 学年度初二上学期期中考试物理试卷 doc 初中物理第一学期期中考试初二物理试卷命题教师吴燕飞审核教师朱艺华2018.10考生注意： 1、全卷六大题，37小题。

试卷5页，及答题卡。

2、答卷一律写在答题卡上，否那么以0分运算，交卷时只交答题卡，试卷自己储存。

3、作图题能够直截了当用铅笔画图。

一、选择题：〔本大题12小题，每题2分，共24分〕 1. 物理课上，教室里静悄悄的，同学们都在全神贯注地听讲。

以以下哪一物体为参照物，讲台是运动的：A .一动不动的同学B .课桌C .正在向后走动的教师 2. 在鼓上放一些纸片，用锤敲击鼓面产生声音，纸片就会跳动，这要紧是因为： A .空气振动使纸片跳动B .纸片跳动时才产生声音C .锤打到纸片上使它跳动D .鼓面的振动引起纸片跳动3. 如图1所示的现象中不能用光的直线传播知识讲明的是：〔考试时刻：60min ，总分值：100分〕D .黑板B.乙图图1C.丙图A •甲图4•用一个木头锤子轻轻地敲击鼓面，和重敲鼓面，关于音调、响度的变化正确的选项是:A.音调不变，响度变大 B .音调变高，C.音调不变，响度变小 D .音调变低，5•在如图2所示的各图象中，用来表示同一种运动规律的图象是：响度变大响度变小D .丁图A .①②B.6•以下成语所反映的情形中，属于光的折射现象的是:A .镜花水月B.坐井观天C.D .②③海市蜃楼 D .立竿见影甲乙t①A .①③B •①④C •②③D •②④ 12 • 一辆小车沿山坡滑下,在第1s 内小车通过了 2m,在第2s 内小车通过了 4m,第3s 内小车通过了6m ,那么有： A .小车作匀速直线运动，速度是2m/sB •小车作变速直线运动，但每秒内的平均速度是 2m/sC •小车作变速运动，在第2s 内的平均速度是 3m/sD .小车作变速运动，在3s 内平均速度是4m/s二、填空题：〔本大题13小题，每题2分，共26分〕13 •一位粗心的同学在测量时忘了写单位，请依照你的体会给他记录的数据后面写上适当的单位：〔1〕一扇门的高度约为 2.3 ___________ ;〔 2〕列车的速度约为 108 ____________ 。

2019-2020学年福建省厦门外国语学校八年级(上)期中数学试卷

2019-2020学年福建省厦门外国语学校八年级（上）期中数学试卷一、选择题（每小题4分，共40分）1．（4分）下列图形中，不是轴对称图形的是（）A．B．C．D．2．（4分）下列计算结果为x6的是（）A．x3•x2B．x2+x4C．（x4）2D．x7÷x3．（4分）如图，已知△ADC中，AB＝AC，BD＝DC，则下列结论错误的是（）A．∠BAC＝∠B B．∠BAD＝∠CAD C．AD⊥BC D．∠B＝∠C4．（4分）下列计算正确的是（）A．（x+y）2＝x2+y2B．（2m2）3＝6m6C．（x﹣2）2＝x2﹣4D．（x+1）（x﹣1）＝x2﹣15．（4分）如图所示，△ABD≌△CDB，下面四个结论中，不正确的是（）A．△ABD和△CDB的面积相等B．△ABD和△CDB的周长相等C．∠A+∠ABD＝∠C+∠CBD D．AD∥BC，且AD＝BC6．（4分）如图所示，AD＝AE，AB＝AC，∠BAC＝∠DAE，B、D、E在同一直线上，∠1＝22°，∠2＝30°，求∠3的度数（）A．42°B．52°C．62°D．72°7．（4分）（x+p）（x+5）＝x2+rx﹣10，则p，r的值分别是（）A．2，﹣3B．2，3C．﹣2，3D．﹣2，﹣38．（4分）如图，AD是△ABC的角平分线，DF⊥AB于点F，且DE＝DG，S△ADG＝50，S△AED＝38，则△DEF 的面积为（）A．6B．12C．4D．89．（4分）如图，两个正方形边长分別为a，b，如果a+b＝9，ab＝12，则阴影部分的面积为（）A．21.5B．22.5C．23.5D．2410．（4分）如图，在等边三角形ABC中，在AC边上取两点M、N，使∠MBN＝30°．若AM＝m，MN＝x，CN＝n，则以x，m，n为边长的三角形的形状为（）A．锐角三角形B．直角三角形C．钝角三角形D．随x，m，n的值而定二、填空题（每小题4分，共24分）11．（4分）2x2y3•（﹣7x3y）＝．12．（4分）点P（﹣3，4）关于原点对称的点的坐标是．13．（4分）如图，OP平分∠AOB，PD⊥OA于点D，点Q是射线OB上一个动点，若PD＝2，则PQ的取值范围为．14．（4分）如图，在△ABC中，AB＝AC，BE＝CD，BD＝CF，∠EDF＝78°，则∠A的度数为．15．（4分）等腰三角形的其中两边长分别为（x+2）（2x﹣5），（x﹣1）2，已知这两边不相等，且x＞5，则该等腰三角形的周长为（用含x的式子表示）16．（4分）计算：40372﹣8072×2019＝．三、解答题（9题，共86分）17．（8分）计算：[（x+2y）2﹣（x﹣2y）（x+2y）]÷2y18．（8分）已知如图，在△ABC中，AB＝AC，O是△ABC内一点，且OB＝OC，求证：AO⊥BC．19．（8分）如图AB⊥l于点B，CD⊥1于点D，点E，F在直线1上，且BF＝DE，AE＝CF．求证：AE∥CF．20．（8分）如图△ABC，请用尺规作出它的外角∠BAE的平分线AD，若AD∥BC，证明：AB＝AC．21．（8分）如图在△ABC中，DE是AC的垂直平分线，AE＝5，△ABD的周长为14，求△ABC的周长．22．（10分）长方形的长和宽分别是a厘米、b厘米，如果长方形的长和宽各减少2厘米．（1）新长方形的面积比原长方形的面积减少了多少平方厘米？（2）如果减少的面积恰好等于原面积的，试确定（a﹣6）（b﹣6）的值．23．（10分）我们已经学习过多项式除以单项式，多项式除以多项式一般可用竖式计算，步骤如下：①把被除式、除式按某个字母作降幂接列，井把所块的项用零补齐；②用除式的第一项除以除式第一项，得到商式的第一项；③用商式的一项去乘除式，把积写在被除式下面（同类项对齐），消去相等项；④把减得的差当作新的被除式，再按照上面的方法继续演算，直到余式为零或余式的次数低于除式的次数时为止，被除式＝除式×商式+余式，若余式为零，说明这个多项式能被另一个多项式整除．例如：计算（6x4﹣7x3﹣x2﹣1）÷（2x+1），可用竖式除法如图：所以6x4﹣7x3﹣x2﹣1除以2x+1，商式为3x3﹣5x2﹣2x﹣1，余式为0．根据阅读材料，请回答下列问题：（1）（x3﹣4x2+7x﹣5）÷（x﹣2）的商是，余式是；（2）x3﹣x2+ax+b能被x2+2x+2整除，求a，b的值．24．（12分）等边三角形△ABC，直线1过点C且垂直AC．（1）请在直线1上作出点D，使得△ABD的周长最小．（2）在（1）的条件下，连接AD，BD，求证，AD＝2BD．25．（14分）已知，△ABC是等腰直角三角形，BC＝AB，A点在x负半轴上，直角顶点B在y轴上，点C在x轴上方．（1）如图1所示，若A的坐标是（﹣3，0），点B的坐标是（0，1），点C的坐标为．（2）如图2，若OA平分∠BAC，BC与x轴交于点E，若点C纵坐标为m，求AE的长．（3）如图3，在（2）的条件下，点F在射线DM上，且∠ABF＝∠ADF，AH⊥BF于点H，试探究BF、HFDF的数量关系．2019-2020学年福建省厦门外国语学校八年级（上）期中数学试卷参考答案与试题解析一、选择题（每小题4分，共40分）1．【解答】解：A、是轴对称图形，故此选项不合题意；B、是轴对称图形，故此选项不合题意；C、不是轴对称图形，故此选项符合题意；D、是轴对称图形，故此选项不合题意．故选：C．2．【解答】解：A．x3•x2＝x5，故本选项不合题意；B．x2与x4不是同类项，所以不能合并，故本选项不合题意；C．（x4）3＝x8，故本选项不合题意；D．x7÷x＝x6，故本选项符合题意．故选：D．3．【解答】解：∵AB＝AC，BD＝DC，AD＝AD，∴△ADB≌△ADC（SSS），∴∠B＝∠C，∠BAD＝∠CAD，∠ADB＝∠ADC，∵∠ADB+∠ADC＝180°，∴∠ADB＝∠ADC＝90°，∴AD⊥BC，故B，C，D正确，故选：A．4．【解答】解：A、原式＝x2+2xy+y2，不符合题意；B、原式＝8m6，不符合题意；C、原式＝x2﹣4x+4，不符合题意；D、原式＝x2﹣1，符合题意，故选：D．5．【解答】解：A、∵△ABD≌△CDB，∴△ABD和△CDB的面积相等，故本选项错误；B、∵△ABD≌△CDB，∴△ABD和△CDB的周长相等，故本选项错误；C、∵△ABD≌△CDB，∴∠A＝∠C，∠ABD＝∠CDB，∴∠A+∠ABD＝∠C+∠CDB≠∠C+∠CBD，故本选项正确；D、∵△ABD≌△CDB，∴AD＝BC，∠ADB＝∠CBD，∴AD∥BC，故本选项错误；故选：C．6．【解答】解：∵∠BAC＝∠DAE，∴∠1＝∠CAE，且AD＝AE，AB＝AC，∴△ABD≌△ACE（SAS）∴∠ABD＝∠2＝30°，∴∠3＝∠2+∠ABD＝52°，故选：B．7．【解答】解：∵（x+p）（x+5）＝x2+（p+5）x+5p＝x2+rx﹣10，∴p+5＝r，5p＝﹣10，解得：p＝﹣2，r＝3．故选：C．8．【解答】解：如图，过点D作DH⊥AC于H，∵AD是△ABC的角平分线，DF⊥AB，∴DF＝DH，在Rt△DEF和Rt△DGH中，，∴Rt△DEF≌Rt△DGH（HL），∴S△EDF＝S△GDH，设面积为S，同理Rt△ADF≌Rt△ADH，即38+S＝50﹣S，解得S＝6．故选：A．9．【解答】解：根据题意，得∵a+b＝9，ab＝12，∴（a+b）2＝92∴a2+2ab+b2＝81，∴a2+b2＝81﹣24＝57，∴阴影部分的面积为：a2﹣b（a﹣b）＝（a2﹣ab+b2）＝（57﹣12）＝22.5．故选：B．10．【解答】解：将△ABM绕点B顺时针旋转60°得到△CBH．连接HN．∵△ABC是等边三角形，∴∠ABC＝∠ACB＝∠A＝60°，∵∠MON＝30°，∴∠ABM+∠CBN＝30°，∴∠NBH＝∠CBH+∠CBN＝30°，∴∠NBM＝∠NBH，∵BM＝BH，BN＝BN，∴△NBM≌△NBH，∵∠BCH＝∠A＝60°，CH＝AM＝n，∴∠NCH＝120°，∴x，m，n为边长的三角形△NCH是钝角三角形，故选：C．二、填空题（每小题4分，共24分）11．【解答】解：原式＝﹣14x5y4，故答案为：﹣14x5y412．【解答】解：根据中心对称的性质，得点P（﹣3，4）关于原点对称的点的坐标是（3，﹣4）．13．【解答】解：由垂线段最短可得PQ⊥OB时，PQ最短，∵OP平分∠AOB，PD⊥OA，∴PQ＝PD＝2，即线段PQ的最小值是2．∴PQ的取值范围为PQ≥2，故答案为PQ≥2．14．【解答】解：∵AB＝AC∴∠B＝∠C，又∵BE＝CD，BD＝CF∴△BED≌△CDF（SAS）∴∠CDF＝∠BED∵∠EDC＝∠B+∠BED＝∠CDF+∠EDF∴∠EDF＝∠B＝78°∴∠C＝∠B＝78°∴∠A＝180°﹣78°﹣78°＝24°故答案为：24°．15．【解答】解：分为两种情况：①当等腰三角形的腰为（x+2）（2x﹣5）时，三角形的三边是（x+2）（2x﹣5），（x+2）（2x﹣5），（x﹣1）2，此时符合三角形的三边关系定理，此时三角形的周长是：（x+2）（2x﹣5）+（x+2）（2x﹣5）+（x﹣1）2＝2x2﹣x﹣10+2x2﹣x﹣10+x2﹣2x+1＝5x2﹣4x﹣19；②当等腰三角形的腰为（x﹣1）2时，三角形的三边是（x+2）（2x﹣5），（x﹣1）2，（x﹣1）2时，∵（x﹣1）2+（x﹣1）2＝2x2﹣4x+2，（x+2）（2x﹣5）＝2x2﹣x﹣10，x＞5，∴（x﹣1）2+（x﹣1）2﹣（x+2）（2x﹣5）＝（2x2﹣4x+2）﹣（2x2﹣x﹣10）＝﹣3x+12＜0，∴（x﹣1）2+（x﹣1）2＜（x+2）（2x﹣5），∴此时不符合三角形的三边关系定理，此时不存在三角形．故答案为：5x2﹣4x﹣19．16．【解答】解：原式＝40372﹣2×4036×2019＝40372﹣4036×4038＝40372﹣（4037﹣1）（4037+1）＝40372﹣（40372﹣1）＝1故答案为：1三、解答题（9题，共86分）17．【解答】解：原式＝[x2+4y2+4xy﹣（x2﹣4y2）]÷2y＝（8y2+4xy）÷2y＝4y+2x．18．【解答】证明：延长AO交BC于点D，在△ABO和△ACO中，，∴△ABO≌△ACO（SSS），∴∠BAO＝∠CAO，∵AB＝AC，∴AO⊥BC．19．【解答】证明：∵AB⊥l于点B，CD⊥1于点D，∴∠ABE＝∠CDF＝90°，∵BF＝DE，∴DF＝BE，∵AE＝CF，∴Rt△ABE≌Rt△CDF（HL），∴∠AEB＝∠CFD，∴AE∥CF．20．【解答】解：如图所示：AD即为所求作的图形．证明：∵AD∥BC，∴∠DAE＝∠C，∠DAB＝∠B，∵AD平分∠BAE，∴∠DAE＝∠DAB，∴∠B＝∠C，∴AB＝AC．21．【解答】解：∵DE是AC的垂直平分线，∴DA＝DC，AE＝CE＝5，而△ABD的周长是14，即AB+BD+AD＝14，∴AB+BC+AC＝AB+BD+CD+AC＝14+10＝24，即△ABC的周长是24．22．【解答】解：（1）ab﹣（a﹣2）（b﹣2）＝ab﹣（ab﹣2a﹣2b+4）＝ab﹣ab+2a+2b﹣4＝2a+2b﹣4，∴新长方形的面积比原长方形的面积减少了（2a+2b﹣4）平方厘米；（2）由题意知2a+2b﹣4＝ab，∴ab＝6a+6b﹣12，（a﹣6）（b﹣6）＝ab﹣6a﹣6b+36＝6a+6b﹣12﹣6a﹣6b+36＝24．23．【解答】解：（1）（x3﹣4x2+7x﹣5）÷（x﹣2）＝x2﹣2x+3 (1)故答案为：x2﹣2x+3，1．（2）由题意得：∵x3﹣x2+ax+b能被x2+2x+2整除，∴a﹣2＝﹣6，b＝﹣6，即：a＝﹣4，b＝﹣6．24．【解答】解：（1）如图所示：作点A关于直线l的对称点A′，连接AA′，与直线l交于点D，则点D即为所求作的点．（2）根据对称性可知：AC＝A′C，AD＝A′D，∵△ABC为等边三角形，∴AC＝BC＝AB，∠ACB＝60°＝∠BAC，∴A′C＝BC，∴∠A′＝∠A′BC＝30°，∠A′＝∠DAA′＝30°，∴∠ABD＝90°，∴AD＝2BD．25．【解答】解：（1）作CH⊥y轴于H，如图1，∵点A的坐标是（﹣3，0），点B的坐标是（0，1），∴OA＝3，OB＝1，∵△ABC是等腰直角三角形，∴BA＝BC，∠ABC＝90°，∴∠ABO+∠CBH＝90°，∵∠ABO+∠BAO＝90°，∴∠CBH＝∠BAO，在△ABO和△BCH中，∴△ABO≌△BCH（AAS），∴OB＝CH＝1，OA＝BH＝3，∴OH＝OB+BH＝1+3＝4，∴C（﹣1，4），故答案为：（﹣1，4）；（2）如图2，过点C作CF⊥AO，交AB的延长线于H，∴∠CBH＝90°，∵CF⊥AO，∴∠BCH+∠H＝90°，而∠HAF+∠H＝90°，∴∠BCH＝∠HAF，且∠ABC＝∠CBH＝90°，AB＝CB，∴△ABE≌△CBH（AAS），∴AE＝CH，∵AO平分∠BAC，∴∠CAF＝∠HAF，且AF＝AF，∠AFH＝∠AFC，∴△AFC≌△AFH（ASA）∴CF＝FH＝m，∴AE＝CH＝2m；（3）BF＝2FH+DF，理由如下：如图3，过点A作AN⊥DF于点N，∵∠CAE＝∠BAE，∠AOB＝∠AOD，∴∠ADB＝∠ABD，∴AD＝AB，且∠ADF＝∠ABF，∠AHB＝∠AND＝90°，∴△ABH≌△ADN（AAS）∴AN＝AH，BH＝DN，∵在Rt△ANF和Rt△AHF中，AN＝AH，AF＝AF，∴Rt△ANF≌Rt△AHF（HL）∴NF＝FH，∵BF＝BH+FH＝DN+FH∴BF＝DF+NF+FH＝2FH+DF．。