(完整)新人教版九年级第十四单元精选练习题附答案(2)

合集下载

人教版九年级物理全一册《第十四章内能的利用》单元测试卷(附答案)

人教版九年级物理全一册《第十四章内能的利用》单元测试卷（附答案)学校:___________班级：___________姓名：___________考号：___________一、单选题1．关于热机的效率，下列说法正确的是（）A．效率高的热机燃料的利用率低B．效率高的热机功率一定大C．效率高的热机功率一定小D．在做了相同的功时，效率高的热机消耗燃料少2．车载冰箱上市得到了许多消费者的青睐。

如图是某品牌车载冰箱，下面关于该冰箱涉及物理知识的说法中，正确的是（）A．打开车载冰箱门，可以降低车内温度B．冰箱内矿泉水温度降低是能量的转化过程C．冰箱散热口摸起来很热，是因为电流的具有热效应D．冰箱内壁有时会出现“白霜”，是水蒸气的凝华现象3．某柴油机工作一段时间后，油箱里的柴油发生变化的是（）A．密度B．比热容C．质量D．热值4．有关四冲程内燃机的叙述中，不正确的是A．工作中只有做功冲程把内能转化为机械能B．工作开始时要靠外力启动C．工作中压缩冲程是把内能转化为机械能D．每一个工作循环，燃气只做功一次5．下列装置工作时发生能量转化的说法中正确的是A．电动机将机械能转化为电能B．汽油机将电能转化为内能C．干电池将电能转化为化学能D．发电机将机械能转化为电能6．如图所示是汽油机工作时的四个冲程，其中说法正确的是（）A．甲冲程中的能量转换过程为内能转换为机械能B．丙冲程是依靠惯性完成的C．使用热值更高的燃料可提高热机的工作效率D．丁冲程中活塞向下运动汽缸内压强变小，大气压将汽油与空气混合物压入汽缸7．2020年11月24日，搭载着“嫦娥五号”探测器的长征五号火箭发射成功，标志着中国“探月工程”第三步拉开序幕，长征五号运载火箭采用无毒，无污染的液氢液氧燃料作推进剂，属于绿色环保大型液体运载火箭，下列说法正确的是（）A．液氢燃烧得越充分，其热值就越大B．燃料燃烧产生高温高压的燃气对火箭做功，燃气的内能会增加C．高温高压的燃气推动火箭升空把内能转化成机械能D．通常情况下气态的氢氧是采用高温高压方式进行加注的8．喜欢思考的小明用塑料矿泉水瓶进行了如下游戏探究：瓶中留有少量水，盖上瓶盖（如图甲）；扭转瓶身（如图乙）；拧松瓶盖（如图丙），瓶盖被瓶内的气体冲出，同时瓶口出现白雾（如图丁）。

(人教版)初中英语九年级 Unit 14单元测试卷含答案

Unit 14I remember meeting all of you in Grade 7.单元测试01第一卷听力部分（15分）Ⅰ.听句子，选择与所听句子相符合的图片（5分）A. B. C.D. E.1.________2.________3.________4.________5.________Ⅱ.听两段较长对话，选择最佳答案（5分）听第一段对话，回答第6~7小题。

6.Where has Jim gone for his holiday?A.To Shanghai.B.To Beijing.C.To Paris.7.Who did David go to Paris with?A. His brother.B.His parents.C.His sister.听第二段对话，回答第8~10小题。

8.How long did Vince skate today?A.About 4 hours.B.About 6 hours.C.About 5 hours.9.When did Vince begin skating?A.At the age of 5.B.At the age of6.C.At the age of 7.10.Who gave Vince the first pair of skates?A.His father.B.His uncle.C.His grandmother.Ⅲ.听长对话和对话后面的问题，选择最佳答案（5分）11.A.He lost his Chinese book. B.He failed the test. C.His teacher can’t help him.12.A.It’s easy. B.It’s difficult. C.It’s interesting.13.A.Math. B. Chinese. C. Science.14.A.Thursday afternoons. B.Saturday afternoons. C.Sunday afternoons.15.A.At school. B.At Ann’s home. C.At Peter’s home.第二卷笔试部分（85分）Ⅳ.单项选择（10分）16.Many students write to Language Doctor to ________ advice about learning English.A.look throughB.ask forC.give upD.worry about17.If you want to change the world, you have to ________ yourself first.A. enjoyB. ask forC. give upD.change18.Who taught you to ________ in music class?A.play the keyboardB.play keyboardC.play on the keyboardD.play on keyboard19.Read the ________ carefully before you take the medicine.A.instructionsB.descriptionsC.collectionsD.expressions20.Who are supposed to be responsible ________ the traffic accident?A.forB.toC.inD.about21.Lily is afraid to speak in public.We should try to help her ________ shyness.A.developB.improveC.overcomeD.reduce22.We have a lot of things to do.But ________ we must get some sleep.A.at onceB. at firstC.first ofallD.all in all23.Many kids ________ volunteers to help others since the terrible earthquake.A.have become；happenedB.have been；happenedC.became；have happenedD.became；happened24.Congratulations ________ all the winners ________ your excellent grades!A.to；onB.to；forC.on；onD.on；for25.I think young people should be ________ knowledge.A.good atB.friendly withC. ready toD. thirsty forV.完形填空（10分）Dear Jenny,How’s it going?Are you busy with your study these days?I’ve been back at school 26 nearly four weeks.I’m very glad to tell you that great 27 have takenplace in our school this term.First of all, we’re asked to"clear our plates" when having our meals and say 28 to wasting.Some of us used to order more than what we could eat.That was a big waste of food.Now we need to 29 the food we order.We should also stop wasting in some other ways.For example, we should turn off the lights when we 30 the classroom.And our school has opened up some fields for us to learn how to grow vegetables.Each class is given a small garden and our class has decided to grow some tomatoes and beans（豆类）in our 31 time.I think that’ll be very interesting.Maybe I’ll be able to 32 you some beans we’ve grown by ourselves next time! What’s more, we have only two classes in the afternoon 33 we have more time for after-school activities.I’m one of the traffic safety volunteers in our school. After school, we take turns to go to the streets near our school and ask people to 34 the traffic rules.Ithink we are having a different school life now!Please write back soon and tell 35 more about your school.Yours,Wang Wei26.A.in B.for C.on D.at27.A.changes B.things C.interests D.lessons28.A.yes B. hello C. no D.thanks30.A.leave B.reach C.open D.build31.A.busy B.free C.happy D.sad32.A.plant B.buy C.post D.lend33.A.because B.when C.before D.so34.A.follow B.make C.break D.thinkⅥ.阅读理解（30分）AWe spend hours, days and years of our lives in our school.Imagine（想象）you could design（设计）your dream school, what would it be like?What would you be doing?We wanted to find out what teenagers around the world thought.Here is what they said:Richard from the USA:My dream school would have a big swimming pool and two soccer fields.It would also have a cinema, a gym and a shopping centre.My school has none of these, and I think there should be more pleasant things for students to do while they are studying.Sonic from Italy:I’d like a room where we can relax and play computer games.I’d also like to have a music room.I think there should be a place for everyone to go and relax after class.Wu from Beijing:I think it would be great to have another day off（休息日）every week besides the weekend.If that day was a Friday or a Monday, we would have a long weekend every week.What fun! I also think school should start later, at about 10 o’clock, and finish earlier.Hannah from Australia:In my dream school, I think the teachers should give us more freedom（自由）and choice about how we study and what we study.I also think it’s not necessary for us to wear school uniforms every day.I really don’t like wearing it.36.There would be ________ in Richard’s dream school.A.a big swimming pool and a music roomB.a room to relax and play computer gamesC.a big swimming pool and a shopping centre37.How many days off does Wu want to have in a week?A.2B.3C.438.Which country is not mentioned（提到）in the passage?A. Italy.B. Japan.C. Australia.39.From the passage we know that ________.A.Sonic from Italy would like a room where she can relax and play computer gamesB.Richard from the USA thinks his dream school should start at 10 o’clockC.Hannah from Australia likes wearing a school uniform every day40.Which is the best title（标题）for the passage?A.Schools in the pastB.Schools todayC.Dream schoolsBMrs Thompson, a school teacher, told the children on the first day that she loved them all the same.But that was a lie.There in the front row was a little boy named Teddy Stoddard.He didn’t get along well with the other children and he always needed a bath. She did not like him.Then Mrs Thompson got to know that Teddy was a very good boy before the death of his mother. Mrs Thompson was ashamed of herself. She felt even worse when, like all her other students, Teddy bought her a present, too. It was his mother’s perfume（香水）。

(含答案)九年级物理人教版全一册《第十四章内能的利用》单元测试02

答卷时应注意事项１、拿到试卷，要认真仔细的先填好自己的考生信息。

２、拿到试卷不要提笔就写，先大致的浏览一遍，有多少大题，每个大题里有几个小题，有什么题型，哪些容易，哪些难，做到心里有底；３、审题，每个题目都要多读几遍，不仅要读大题，还要读小题，不放过每一个字，遇到暂时弄不懂题意的题目，手指点读，多读几遍题目，就能理解题意了；容易混乱的地方也应该多读几遍，比如从小到大，从左到右这样的题；４、每个题目做完了以后，把自己的手从试卷上完全移开，好好的看看有没有被自己的手臂挡住而遗漏的题；试卷第１页和第２页上下衔接的地方一定要注意，仔细看看有没有遗漏的小题；５、中途遇到真的解决不了的难题，注意安排好时间，先把后面会做的做完，再来重新读题，结合平时课堂上所学的知识，解答难题；一定要镇定，不能因此慌了手脚，影响下面的答题；６、卷面要清洁，字迹要清工整，非常重要；７、做完的试卷要检查，这样可以发现刚才可能留下的错误或是可以检查是否有漏题，检查的时候，用手指点读题目，不要管自己的答案，重新分析题意，所有计算题重新计算，判断题重新判断，填空题重新填空，之后把检查的结果与先前做的结果进行对比分析。

亲爱的小朋友，你们好!经过两个月的学习，你们一定有不小的收获吧，用你的自信和智慧，认真答题，相信你一定会闯关成功。

相信你是最棒的！《第十四章内能的利用》单元测试一、单选题1．关于四冲程汽油机的工作过程有以下几种说法：①在压缩冲程中，是机械能转化为内能②在做功冲程中，是内能转化为机械能③只有做功冲程是燃气对外做功④汽油机和柴油机的点火方式相同以上说法中正确的是（）A．只有②③B．只有①③C．只有②④D．只有①②③2．关于四冲程汽油机，下列说法中正确的是（）A．在吸气冲程，吸入气缸内的是空气B．在压缩冲程，燃料燃烧，化学能转化为内能C．在做功冲程，内能转化为机械能D．在排气冲程，进气门和排气门都打开3．一台单缸四冲程汽油机的飞轮转速为每分钟1200转，则汽油机每秒内() A．完成20个冲程，做功20次B．完成40个冲程，做功40次C．完成40个冲程，做功10次D．完成20个冲程，做功20次4．下列关于四冲程内燃机的说法中正确的是（）A．热机效率越高，所做的有用功就越多B．一个工作循环对外做功一次C．汽油机在吸气冲程中吸入汽缸的是空气D．汽油机在压缩冲程中将内能转化为机械能5．单缸四冲程汽油机铭牌上标有“3000r/min”，则以下说法不正确的是（）A．在压缩冲程中，是内能转化为机械能B．在工作过程中，汽油机每秒钟完成100个冲程，做功25次C．只有做功冲程是燃气对外做功D．汽油机和柴油机的点火方式不同6．如图所示是四冲程汽油机一个工作循环中的三个冲程，缺少的一个冲程的名称及顺序，下列判断正确的是A．吸气冲程，应在甲图之前B．压缩冲程，应在甲、乙图之间C．做功冲程，应在乙、丙图之间D．排气冲程，应在丙图之后7．一杯酒精减少一半后，则（）A．热值和比热容都不变B．热值减半、比热容不变C．热值和比热容都减半D．热值不变、比热容减半8．近几年煤炭价格较高，少数不法商贩将煤矸石、破碎石掺在优质煤中高价销售，客户为不上当，最恰当的方法是检测煤的（）A．温度B．质量C．热值D．比热容9．做同样的功，甲柴油机用3h，消耗2kg柴油；乙柴油机用2h，消耗掉3kg柴油，下列说法中正确的是（）A．甲的功率大，效率低B．甲的功率大，效率高C．乙的功率大，效率低D．乙的功率大，效率高10．关于燃料的热值，下列说法中正确的是（）A．汽油的热值为4.6×107J/kg，表示每燃烧1kg的汽油可以获得4.6×107J的热量B．燃料的热值越大，燃烧时放出的热量越多C．燃料不燃烧时，热值为0D．燃料的热值与燃料燃烧时放出的热量和质量无关11．下列说法中不正确的是（）A．快速行驶的车辆急刹车停下来过程中能量消失了B．水壶里的水烧开时，水蒸气把壶盖顶起，内能转化为机械能C．用锯条锯木板时，锯条发热，锯条的内能增加D．相同质量的0℃的冰和0℃的水相比较，0℃的水内能大12．下列有关能量转化的表述中，正确的是（）A．汽油机做功冲程中，机械能转化为内能B．蓄电池充电时化学能转化为电能C．匀速上升的电梯中的人，动能转化为重力势能D．电饭锅工作时电能转化为内能13．甲内燃机比乙内燃机的效率高，表示A．甲的功率大B．甲燃料的热值比乙燃料的热值大C．工作时间相同，甲耗油较少D．甲用来做有用功的那部分能量与燃料完全燃烧放出的能量之比较大14．第41届世博会已于2010年5月1日在上海开幕．为了体现“城市，让生活更美好”的世博会主题精神，某校同学提出下列环保建议，其中你认为可行的是①开发新能源，减少化石燃料的燃烧；②提倡使用一次性发泡塑料餐具和塑料袋；③开发生产无汞电池；④提倡使用手帕，减少餐巾纸的使用；⑤分类回收垃圾A．①③⑤B．①③④⑤C．①②③⑤D．①②③④⑤二、填空题15．一台单缸四冲程汽油机在做功冲程时，其气缸中的气体内能______（填“增大”或“减小”）；若在1秒钟的时间内刚好完成40次工作循环，则该汽油机飞轮的转数为______ r/min。

人教版九年级英语全册 Unit14 单元测试题(含答案)

人教版九年级英语全册 Unit14 单元测试题（含答案）本试题分第Ⅰ卷(选择题)和第Ⅱ卷（非选择题）两部分。

第Ⅰ卷共5页，满分为75分；第II卷共2页，满分为45分。

本试题共6页，满分120分，考试时间为90分钟。

第I卷(选择题共75分)（）1. ― What movie will be shown ______ TV tonight?― Shaolin Temple.A. inB. atC. fromD. on（）2. When you travel to a city, you’d better buy a to get more information about it.A. newspaperB. suitcaseC. guidebookD. camera（）3. Maybe I have heard of this girl before, but I can ______ remember her name.A. hardlyB. reallyC. mostlyD. easily（）4. _______ trees were cut off. And many birds lost their home.A. Thousand ofB. Thousands ofC. Two thousandsD. Two-thousand（）5. ― Are you full now?― No. I want ______ apple pies.A. more oneB. one moreC. more twoD. two more( ) 6. You ________ ever saw computers years ago, but now they are everywhere. A. sometimes B. usually C. hardly D. almost( ) 7. This is a very big company. It has______ workers. Do you want to work here?A. five thousandB. five thousandsC. five thousands ofD. five thousand of( ) 8. My job is feeding the cat. Now it’s your turn______ the dog.A. feedingB. to feedC. to have fedD. being fed( ) 9. My friend, Darren, is coming to visit us. I’m looking forward _______ him.A. meetB. meetingC. to meetD. to meeting( ) 10. —The radio is too noisy and there is nothing interesting on it. Why don’t you______ ?—All right. I’ll do that.A. turn it onB. turn it offC. turn it backD. turn it up（）11. ― Have you ever________ to a zoo?― Yes, but only once. I visited Beijing Zoo last year.A. goneB. beenC. visitedD. seen（）12. ― What are you ______ your suitcase for?― I’m ready for a trip.A. makingB. shuttingC. packingD. putting（）13. — How long ______ the movie Aftershock ______?— For just several minutes.A. did; beginB. has; begunC. has; been onD. will; on（）14. ― When did you start your math homework?― One hour ago, but I________ it yet.A. didn’t finishB. finishedC. have finishedD. haven’t finished（）15. ― What a cool day! How about climbing Mount Tai?― ________. Let’s ask Yang Liu to go with us.A. Never mindB. Not at allC. Sounds greatD. Good luck（）16. Please go to the station to _______ when the train to Beijing starts to leave.A. find forB. look forC. find outD. find（）17. Mr. Green is rich. He ______ his dog ______ meat.A. feed, onB. feeds, onC. give, toD. feeds, for（）18. ________ have you been in China?A. How longB. How oftenC. How soonD. How far（）19. He does business in Shanghai. He ______ Shanghai the day after tomorrow.A. leaves forB. is leaving forC. left toD. is leaving to( ) 20. He _______ carefully but he could not ________ his teacher clearly.A. heard, listenB. listen, hearC. listened, hearD. heard, listened ( ) 21. He kissed his wife and then ______ goodbye ______ her when he left home.A. say, toB. said, toC. spoke, toD. said, with( ) 22. We need friends to ________, or we will feel ________.A. chat, aloneB. chat with, lonelyC. speak, lonelyD. talk with, alone ( ) 23. Mike is _______ honest man. I __________ him.A. an, believe onB. a , believe inC. an, believe inD. the, believe ( ) 24. This story ______ tells us how Bill Gates becomes successful.A. mostlyB. mainlyC. mostD. Both A and B( ) 25. ― Thank you very much for your nice present.― ___________.A. I’m very glad you like it.B.No, thanks.C. Oh, it’s nothing.D.No, it’s very cheap（）26.---Have you ever______ to Hawaii before?---Yes, it’s beautiful. It is better than any_____ in AustraliaA. gone; beachB. been; beachC. gone; beachesD. been; beaches（）27. When we got to the bus stop, the bus ______ for about half an hour.A. has leftB. leftC. has been awayD. had been away（）28.---How long have you been a league member?--- ________ .A. A long time agoB. Since two yearsC. For about a yearD. In 2006（）29.The parents encouraged their daughter______ her EnglishA. improvingB. improvesC. improvedD. to improve（）30.The meeting has already started for about ten minutes but Henry______ yet.He must have something important to do.A. hasn’t led us to itB. has turned pointC. hasn’t appearedD. miss itⅡ. 完形填空（15分）阅读下列短文，选择可以填入空白处的最佳选项。

人教版九年级全册《第十四章内能的利用》物理单元测试卷和答案详解

人教版九年级全册《第14章内能的利用》单元测试卷（2）一、选择题（每小题3分，共36分）1．（3分）如图所示，在试管内装适量水，用橡胶塞塞住管口，将水加热至沸腾一段时间后，橡胶塞被推出，管口出现大量“白气”。

此实验中，主要是通过做功改变物体内能的过程是（）A．试管变热的过程B．水变热的过程C．水变成水蒸气的过程D．水蒸气推出橡胶塞的同时变成“白气”的过程2．（3分）关于内燃机，下列说法正确的是（）A．内燃机的实际工作效率可达100%B．汽油机和柴油机使用同种燃料C．汽油机和柴油机均属于内燃机D．在做功冲程中，机械能转化为内能3．（3分）2019年春节期间热映的《流浪地球》被誉为开启了中国科幻电影元年。

这部电影讲述了多年以后太阳急速衰老膨胀，无法再给地球提供能量，人类为了拯救地球而点燃木星周围的可燃气体，逃离太阳系的故事。

其中“点燃木星”将地球推开相当于内燃机的（）A．做功冲程B．压缩冲程C．吸气冲程D．排气冲程4．（3分）一种用于轻型低速飞机的活塞式航空发动机，它有多个气缸，气缸工作时经历进气、压缩、膨胀、排气四个过程，在这四个过程中，能为飞机提供动力的是（）A．进气B．压缩C．膨胀D．排气5．（3分）实验装置如图所示，加热试管使水沸腾，对观察到的现象分析正确的是（）A．玻璃管口冒出的“白气”是汽化成的水蒸气B．加热使水升温是通过做功的方式改变水的内能C．小叶轮的转动说明永动机是可以实现的D．小叶轮转动，水的内能转化为叶轮的机械能6．（3分）如图是汽车四冲程发动机的一个冲程示意图，下列说法正确的是（）A．该冲程是做功冲程B．该冲程机械能转化为内能C．这种汽车对环境没有污染D．此发动机的效率可达90%7．（3分）将一瓶酒精用去三分之一，则剩余酒精的密度、比热容和热值（）A．热值不变，密度、比热容变为原来的三分之二B．都变为原来的三分之二C．热值变为原来的三分之二，密度、比热容不变D．都不变8．（3分）西昌卫星发射中心用长征三号运载火箭，于2019年4月20日将第四十四颗北斗导航卫星成功送上太空。

人教版九年级物理全一册《第十四章内能的利用》单元练习题-带参考答案

人教版九年级物理全一册《第十四章内能的利用》单元练习题-带参考答案学校:___________班级：___________姓名：___________考号：___________一、单选题1．下列关于热现象的说法正确的是（）A．铁丝反复弯折处会发热，这是通过做功的方式改变了内能B．看到飞絮飘舞说明分子在不停地做无规则运动C．汽车排气管废气的温度越高，发动机的效率越高D．气体没有固定形状，表面气体分子间没有引力2．如图所示，把热水壶放在煤气灶上将水烧开时，水蒸气会顶起壶盖冲出壶外，这个现象与汽油发动机的哪个冲程原理相同（）A．吸气冲程B．压缩冲程C．做功冲程D．排气冲程3．如图所示，甲、乙、丙三图的装置完全相同，用如图装置完成“探究不同物质吸热升温现象”和“比较质量相等的不同燃料燃烧时放出的热量”。

为了方便探究，下列物理量无需一样的是（）A．三个装置的液体质量B．三个装置液体的初温C．甲、乙燃料燃烧时间D．甲、丙燃料单位时间内释放热量4．汽车已经成为现代生活中不可缺少的一部分，现代汽车多数采用汽油机作为发动机，如图所示是四冲程汽油机的一个冲程，对该冲程判断正确的是（）A ．吸气冲程B ．内能转化为机械能C ．机械能转化为内能D ．做功冲程5．如图甲是某单缸四冲程汽油机某一冲程工作示意图，该汽油机的能量流向如图乙所示，某段时间汽油机完全燃烧0.1kg 的汽油放出的热量为4.2×106J ，水的比热容为34.210J )/(kg ⨯⋅℃，下列有关说法正确的是（）A ．图甲所示冲程的能量转化是将内能转化为机械能B ．若汽油机飞轮转速为1800r/min ，则汽油机1s 对外做功30次C ．1标准大气压下，汽油机完全燃烧0.1kg 汽油，可使汽车水箱中50kg 、20℃的冷却水升温20℃D ．用水做汽油机的冷却液是因为水的沸点较高6．天问一号负责执行中国第一次自主火星探测任务，于2020年7月23日在文昌航天发射场发射升空。

(人教版)九年级物理全一册《第十四章内能的利用》单元测试卷-带答案

（人教版）九年级物理全一册《第十四章内能的利用》单元测试卷-带答案一、单选题1．多数汽油机是由吸气、压缩、做功、排气四个冲程的不断循环来保证连续工作的，从能量转化的角度看，存在着内能转化为机械能的过程的是A．吸气冲程B．压缩冲程C．做功冲程D．排气冲程2．2022年10月31日，搭载“梦天”实验舱的“长征五号B遥四”运载火箭成功发射。

火箭加速升空的过程中，燃料燃烧提供火箭升空所需的能量。

随着燃料质量不断减小，其热值（）A．变大B．变小C．不变D．无法判断3．如图，2023年10月26日11时14分，搭载神舟十七号载人飞船的长征二号F遥十七运载火箭在酒泉卫星发射中心点火发射，卫星顺利进入预定轨道，发射任务获得圆满成功。

长征二号F遥十七运载火箭用液氢作为燃料是利用液氢具有（）A．较大的比热容B．较高的热值C．较小的密度D．较低的沸点4．正在煮饭的高压锅限压阀被气流顶起，下列选项中汽油机的各冲程与其原理相同的是（）A．B．C．D．5．下列关于四冲程内燃机的说法中不正确的是（）A．热机效率越高，所做的有用功就越多B．汽油机在吸气冲程中吸入汽缸的是汽油和空气的混合物C．汽油机工作时，一个工作循环对外做功一次D．尽量减少热机内部各部件间的摩擦可以提高效率6．如图所示四种内燃机工作时的示意图，一个工作循环的正确顺序是（）.A ．甲，乙，丙，丁B ．丙，丁，乙，甲C ．甲，丁，乙，丙D ．甲，丙，乙，丁7．关于汽油机的四个冲程，下列说法正确的是（）A ．吸气冲程，吸入的成分只有汽油B ．压缩冲程，将内能转化为机械能C ．做功冲程，当转速是1800r/min ，1秒钟完成30个做功冲程D ．排气冲程，废气带走了大部分的能量。

8．汽油机甲，飞轮每分钟转2400转，汽油机的汽缸容积为150cm 3，满负荷工作时做功冲程燃气的平均压强为2.0×106Pa ，且甲汽油机一分钟消耗25g 汽油。

汽油机甲与汽油机乙的效率比值为5∶4，汽油机甲的功率是乙的2.5倍，则汽油机甲的功率和甲、乙汽油机相同时间的油耗之比为（）（汽油的热值为4.8×107J/kg ）A ．3.6×106W ；2∶1B ．6000W ；2∶1C ．3.6×106W ；1∶2D ．6000W ；1∶2二、填空题9．燃油汽车的核心部件是热机，通过冲程将废气排出汽缸，造成大气污染，电动汽车正逐步替代燃油汽车。

1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。

新人教版九年级第十四单元精选练习题附答案Unit 14 I remember all of you in Grade 7.第一课时Section A(1a～2d)01基础过关Ⅰ. 根据句意及汉语提示填写单词。

1. We are doing a ________(调查) about the most popular sport among the students.2. ________(将要) we meet at the school gate tomorrow?3. Our students achieve very high ________(水平) of musical ability.4. Our teacher is showing us a new ________(方法) of writing.5. Jane's husband is ill and she has to do ________(两倍的) work.Ⅱ.用方框中所给单词的适当形式填空。

see，finish，row，instruct，clear6. I sit in ________ Three. Just behind Nancy.7. Read these ________ carefully before you use the machine.8. We should guide the students ________ the survey report.9. The teacher speaks loudly so that the students can hear her ________.10. Didn't you remember ________ me here last year?Ⅲ. 单项选择。

(选出与句子画线部分意义最相近的一项)( ) 11. (泸州中考)Please remember ________ your notebook here tomorrow.A. bringsB. broughtC. bringingD. to bring( ) 12. (武汉中考)—Will you fix up the machine according to the ________，David?—No problem.A. instructionsB. inventionsC. invitationsD. interviews( ) 13. Miss Wang is always patient ________ me.A. toB. aboutC. withD. in( ) 14. I wonder how they are going to explain for losing three games ________？A. in generalB. all of a suddenC. to our surpriseD. in a row( ) 15. Luke told me to take a break from running.A. have a breakB. take a restC. have a restD. all the aboveⅣ. 根据汉语意思完成句子，每空一词。

16. 他只不过是个孩子，你应该对他耐心点。

He is just a child，so you should ________ ________ ________ him.17. 他们失败之后决定更拼搏，并且投入更多的努力。

They decided to work harder and ________ ________ ________ ________ after their failure.18. 去年她连续四次获胜。

She won four times ________ ________ ________ last year.19. 因为你，我们没有按时完成这项任务。

We didn't finish the task on time ________ ________ you.20. 在日常生活中，我的老师经常帮助我解决困难。

My teacher often helps me ________ ________ difficulties in daily life.02能力提升Ⅴ. 补全对话。

根据对话内容，从方框中选择合适的选项补全对话。

(其中有两项多余)A: Are you going to leave school at the end of the term?B: 21A: What are you going to do?B: I want to find a job. Many jobs are offered in the newspapers.A: 22B: A tour guide. I want to travel around the world.A: That sounds interesting!B: I think so. 23A: I'm going to be a teacher. 24B: I hope your dream will come true.第二课时Section A(3a～3c)01基础过关Ⅰ. 根据句意及汉语或首字母提示填写单词。

1. You have to ________(克服) your shortcomings.2. What a ________(混乱) your room is! Please clean it up.3. Her son g________ from Harvard last year.4. No matter what happens，do remember to keep your c________.5. I'll try to be a loving and c________ person in my life.Ⅱ.用方框中所给单词的适当形式填空。

excite，we，love，care，graduate6. Their school is very beautiful，________ is even more beautiful.7. Helen is a ________ woman and she is always considering others more than herself.8. Luke worked as a manager after ________ from university.9. I'll never forget the ________ of the school art festival.10. Jessica is a ________ girl with two big eyes.Ⅲ. 根据汉语意思完成句子，每空一词。

11. 当我们面对困难时，我们应该沉住气。

We should ________ ________ ________ when we face difficulties.12. 当我回想起那些日子，我禁不住笑了。

When I ________ ________ ________ those days，I couldn't help laughing. 13. 迈克在他妈妈出去的时候把卧室搞得一团糟。

Mike ________ ________ ________ in the bedroom when his mother went out.14. 彼得来自异国他乡。

Peter is ________ ________ ________ ________.15. 我们在准备期末测试。

We're ________ ________ the final exam.02能力提升Ⅳ. 完形填空。

When he was 12 years old，the boy did something he only later realized probably hurt his teacher. He was，after all，a(n) 16 at that time. When he was older and wiser，he wanted to 17 this teacher and say sorry. 18 the teacher seemed to have disappeared.In the past thirteen years，the boy，Larry Israelson，19 turned to the Internet，typing the teacher's name into search boxes. He found 20 .But he never stopped searching. Last month—by now nearly 42 years after the event happened— 21 succeeded.Excited，he started reading a news report I had written in a magazine about a program that helps kids. He studied a photo and found his teacher，who was a volunteer. He then emailed me and asked me to introduce him to the teacher，James Atteberry.I got in touch 22 Atteberry. He agreed to talk to his student. Soon，I received a letter. I immediately sent it to Atteberry.As Atteberry read the 23 ，he was brought back to 1973，when he was a history teacher. In the letter，Larry said，“I am truly 24 for leaving your Seventh Grade class during the 1972—1973 school year. I don't have many memories from school，but at the top of my exercise book you wrote ‘You will go far in life.’25 my school life，I was proud to be your student.”When it comes to apologies，no one gets a pass. Everyone needs to receive one，and everyone needs to give one.( ) 16. A. kid B. teacher C. old man D. famous person( ) 17. A. refuse B. believe C. find D. leave( ) 18. A. Since B. But C. Because D. So( ) 19. A. never B. hardly C. seldom D. often( ) 20. A. everything B. something C. nothing D. anything( ) 21. A. you B. they C. she D. he( ) 22. A. for B. with C. about D. to( ) 23. A. report B. story C. book D. letter( ) 24. A. sorry B. happy C. proud D. excited( ) 25. A. Looking forward to B. Looking back atC. Talking back toD. Catching up with第三课时Section A(4a～4b)01基础过关Ⅰ. 根据句意及首字母或汉语提示填写单词。