四年级下册英语随堂练习

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精编新陕旅版四年级下册英语第二和第三单元课时练随堂练含答案

Unit 2 I'm Cooking in the Kitchen 第一课时一、读一读，连一连。

eat stand read write sit sleep cook listen写吃睡觉坐阅读听睡觉做饭二、英汉互译。

1. 跑开2. 跳绳3. 唱歌4. 读书5. 写一封信6. go to sleep7. listen to music8. stand up 9. cook dinner 10. sit down三、看图选句子。

A. My mother is cooking dinner.B. The boy is writing a letter to his friend.C. He is sleeping.D. Xiaoming is reading a book.E. My sister likes singing.F. The girl is listening to music.（）1.（）2.（）3.（）4.（）5.（）6.四、读句子，选择合适的单词填入横线处。

1. They are listening （to/on）music.2. Cats like to （eating/eat）fish.3. I want to go （in/to）sleep.4. She stand （up/down）and leave（离开）.5. My mother is （cook/cooking）dinner.参考答案一、eat stand read write sit sleep cook listen写吃站立坐阅读听睡觉做饭二、1. run away 2. jump rope 3. sing a song4.read a book5. write a letter6. 入睡7. 听音乐8.站起来9. 做晚餐10. 坐下三、1. D 2. E 3. B 4. C 5. A 6. F四、1. to 2. eat 3. to 4. up 5. cookingUnit 2 I'm Cooking in the Kitchen 第二课时一、单项选择。

人教精通版英语(三起点)四年级下册同步课堂练习试题及答案(全册)

Unit 1 Welcome to my new home! Lesson 1同步练习一、英汉互译1.hello________ 6.新的_________2.welcome_________ 7.桌子_________3.bedroom_________ 8.椅子________4. desk_________ 9.卧室________5 home_________ 10.床__________二、翻译下列句子1.欢迎来到我的新家__________________________.2.这有一张新床______________________________.3.There is a new desk and a new chair.________________________________________。

4.Look at my new room.________________________________________。

5.这里有一把椅子在我的卧室里。

________________________________________。

6.你能把它们写出来吗？________________________________________。

7.看我的卧室。

________________________________________。

三、选词填空to at in a1．There is ( ) new desk and a new chair.2．Welcome ( ) my new home.3．Look ()my new home.4．There is a new desk and a new chair（）my bedroom．四、连词成句1．doing，you，what，are (？)2．mugs，am，the，I，washing (?)3．kitchen，at，have，can，a，the，I，look (？)4．you，what，for，I，can，do (？) 5．housework，can，for，some，you，do，me (？)答案一、1.你好 2.欢迎 3.卧室 4.桌子 5.家 6.new 7.desk 8.chair 9.bedroom 10.bed.二、1.welcome to my new home.2.there is a new bed,3.这里有一张桌子和一把椅子。

精编PEP人教版四年级英语下册1——3单元同步练习课时练习随堂练习含答案(20课时含Recycle 1)

四年级英语下册1——3单元同步练习含答案（20课时含Recycle 1）目录：PEP人教版四年级下册Unit 1 My school 随堂练习含答案（6课时）PEP人教版四年级下册Unit 2 What time is it练习含答案（6课时）PEP人教版四年级下册Unit 3 Weather随堂练习含答案（6课时）PEP人教版四年级下册Recycle 1随堂练习含答案(2课时)四年级英语下册Unit 1 My school 同步练习含答案（6课时）Unit 1 My school Part A（3课时）Part A第一课时一、按要求写单词或短语。

1.two（序数词）___________2.teachers（名词所有格）___________3.w here’s （完整形式）____________4.紧邻（汉译英）____________二、单项选择。

( ) 1. Where ______ the dog?A.isB. anC. are( ) 2. —______ the teachers’ office?—It’s on the second floor.A. WhereB. W here’sC. What’s( ) 3. The library is ______ the first floor.A. onB. toC. at( ) 4. Here’s ______ homework.A. IB. youC. my( ) 5. ______ you have a library?A. DoB. DoesC. Doing三、给下列问句选择相应的答语。

( ) 1. Is this the teachers’ office?( ) 2. Where is the library?( ) 3. Is the library on the second floor? ( ) 4. Is Classroom 2 next to Classroom 3?答案：一、1. second 2. teachers’ 3. where is 4. next to二、1.A 2.B 3.A 4.C 5.A 三、1.D 2.C 3.B 4.AUnit 1 My schoolPart A 第二课时一、连线。

译林版四年级英语下册4BUnit7随堂练习

译林版四年级英语下册4BUnit7随堂练习一、选出与其余单词不同的的一项( ) 1. A. happy B. sad C. dad( ) 2. A. hungry B. water C. milk( ) 3. A. thirty B. thirsty C. thirteen( ) 4. A. nose B. mouth C. ill( ) 5. A. open B. tired C. close二、单项选择( ) 1. —I’m _____. —Here’s a pie.A. hungryB. thirstyC. tired( ) 2. Can I have _____ milk , Mum?A. anyB. aC. some( ) 3. —______, dear. —Good night, Dad.A. GoodbyeB. Good nightC. Good evening( ) 4. —______ you happy? —Yes , I _______.A. Do; doB. Are; areC. Are; am( ) 5. _____ the matter?A. WhatB. Who’sC. What’s( ) 6. —I’m hot. —Here’s _____ for you.A. a fanB. an umbrellaC. a chair( ) 7. —Where ______ my shoes? —Under the bed.A. isB. amC. are( ) 8. —How is your father? —He’s _____.A. tiredB. fortyC. in the room( ) 9. —Can I have ______ ice creams? —Yes, please.A. aB. someC. any( ) 10. —What’s the matter? —I’m _____.A. badB. illC. happy( ) 11. —I can’t play football. —Don’t be ____. Have a try.A. happyB. sadC. tired三、根据所设情景，选择正确的答案。

新版外研版小学英语四年级下册练习卷课堂练习卷测试卷

新版外研版⼩学英语四年级下册练习卷课堂练习卷测试卷新版外研版⼩学英语四年级下册练习卷课堂练习卷测试卷⼀、选出下列不同类的单词：（20分）（）1、A.nice B.clever C.door （）2、A.teacher B.pupil C.shy（）3、A.naughty B.curl C. cute （）4、A.big B.very C.good（）5、A.mother B.friend C.little （）6、A.is B. this C.these（）7、A.he B.she C.my （）8、A.boy B.girl C. cool（）9、A.tall B.look C.is （）10、A.myB.sheC.his⼆、选择正确的单词填空1. Mr smart is a ____（好的）teacher .2. My brother is a very ___ _ （聪明的） boy .3. My litter sister is a bit _____（害羞的）4. This girl is very _____( 可爱的).5. This boy is very ________ (淘⽓的).三、连词成句,注意标点符号。

1. a bit / she / is /shy__________________________________________ .2. friends / my / are / these__________________________________________ .3. Ms smart / nice /is/ a / teacher_______________________________________ .4. he / very/ is/ naughty______________________________________.四、选择题1.Are these your friends? -------A.Yes , they do .B. Yes , they are.2. What’s that ? -------A. It’s a toy monkey .B. No, it’s a monkey.3. Are you from Beijing? -------A. Yes , I am.B. Yes , I’m not.4.That Maomao. She is nice.A.are; veryB.is ; very外研版三起四年级英语下M2练习卷⼀、写出下列字母的⼤⼩写：（13分）B D E G H I K M P Q R U b d e f h i j n o q r s v y⼆、写出下列单词的正确中⽂意思：（20分）1、ship 2.whose 3.old 4.beautiful5.famous6.queen7.city8.close三、选择填空：（20分）（）1、This is . A .a River Thames B .the river thames C .the River Thames（）2、is the capital of England . A .London B .Beijing C .Washington d.c.（）3、This is a book luxun . A .to B .about C .of（）4、The Great Wall is very .A .short and wideB .long and very oldC .wide and very beautiful （）5、My father is . A .young and beautiful B .very small and cool C .young and cool （）6、This is house . A .Lingling`s B .Lingling of C .lingling`s（）7、My English teacher England . A.be from B .are from C .is from（）8、This is Hyde Park .It`s very . A .long B .small C .famous（）9、Tian`anmen is very famous ,and it`s beautiful , . A .to B .too C ,now（）10、this tree tall? Yes , it is . A .Are B .Is C .Am连词成句1. a city big London (.)2.this is what (?)3.big very It’s beautiful and (.)4.home is my this (.) old it’s (.)外研版三起四年级英语下M3练习卷⼀、找出下列不同类型的单词：（）1、A .take B .help C .picnic （）2、A .Great B .Oh C .ball（）3、A .because B .kite C .so （）4、A .Thursday B .why C .Tuesday（）5、A .will B .homework C .picnic （）6、A .capital B .famous C .beautiful（）7、A .long B .wide C.about （）8、A .England B .China C .London（）9、A .will B .so C .won’t （）10、A .play B .onC .start⼆、将下列单词填⼊对应括号内：星期⽇（）星期⼀（）星期⼆（）星期三（）星期四( ）星期五（）星期六（）星期（）假⽇（）不会（）将会（）机器⼈（）Tuesday Monday Sunday Thursday tomorrow Friday today Saturday Wednesday week三、选择填空：（20分）（）1、Why not ? tomorrow is Friday . A .So B .Because C .And（）2、take your kite tomorrow ? A .Will you B .You will C .Are you（）3、I`ll go swimming Tuesday. A .at B .in C.on （）4、Today is Sunday and tomorrow is . A .Saturday B .Tuesday C .Monday（）5、On Saturday we have a picnic . A .are going to B .is going to C .am going to（）6、Will you take your ball ? A .Yes ,I won`t B .No ,I won`t C .No ,I will（）7、What will Shanshan do on Monday ?She help her mother. A .wills B .is willing C.will（）8、On Sunday she is going to her homework.. A .do B .does C .did（）9、Lingling will her grandmother next week . A .visits B .is going to visit C .visit（）10、I will on Wednesday . A .go the park B .go to park C .go to the park连词成句1. a it’s robot (.)2. do housework they will the (.)3.children they learn help will (.)4.can it walk (.)5.Monday go I’ll on swimming (.)外研版三起四年级英语下M4练习卷写出下列单词的中⽂意思take fly picnic great why not?why so because cloudy weather选择题（）1、What`s that ? a robot . A.This is B.That is C.It`s（）2、they do our homework ? No ,they won`t . A. Will B.Can C.Are（）3、Robots can . A.talks B.taiking C.talk（）4、And they will help children . A .learns B .learn C .learning（）5、One day robots will do everything . A .⼀天 B .总有⼀天C .过去⼀天（）6、It will tomorrow. A .rain B .raining C .rainy（）7、Will it be in Shenyang ? A .snow B .snowy C .is snow（）8、The weather will be in Guangzhou . A .sun B .suny C .sunny（）9、Will it be windy tomorrow ? A . I won`t know B .I don`t know C .I can`t know（）10、you walk fast ? Yes , I . A .Will can B .Can can C .Can will连词成句：1、kite you will tomorrow take your (?)2、it Will hot today be (? )3、tomorrow Friday because is (. )4、going to on Saturday we’re have a picnic (.)5、in be Harbin It cold will .根据信息.完成短⽂：Monday Tuesday Wednesday Thursday Friday,SaturdayandSundayon Monday .But it will be on Tuesday .It will be on Wednesday.It will on Thursday .And on Friday,Saturday and Sunday it will .Children won`t go out to play on Saturday and Sunday.外研版三起四年级英语下M5练习卷写出下列单词的中⽂意思was then grandparent were youngold hair so short longwasn’t weren’t clean dirty⼀、找出下列不同类型的单词：（）1. A .young B . girl C .old（）2. A .who B .why C .we（）3. A .were B .am C .is（）4. A .hair B .long C .short （）5. A .so B .naughty C .cute⽤所给词的正确形式填空.每词⽤⼀次。

四年级英语随堂练习题

四年级英语随堂练习题一、选择正确的单词填空。

（每小题1分，共10分）1. I ___________ a book in my bag.A. haveB. hasC. had2. This is my ___________ pencil case.A. friend'sB. friends'C. friends3. He ___________ to school every day.A. walkB. walksC. walked4. Sarah ___________ playing basketball.A. likeB. likesC. liked5. My father is a ___________.A. teacherB. teachC. teaches6. We ___________ a picnic last weekend.A. haveB. hasC. had7. My brother and I ___________ in the same school.A. studyB. studiesC. studied8. The cat ___________ under the table.A. sleepB. sleepingC. sleeps9. ________ is my English teacher.A. WhereB. WhatC. Who10. He ________ a lot of friends in his new school.A. haveB. hasC. had二、根据图片和首字母提示，写出相应的单词。

（每小题1分，共10分）1. A: What's this?B: It's a b_________.2. A: Where is the b_________?B: It's in front of the school.3. A: What are they doing?B: They are p_________ football.4. A: What is she w_________?B: She is wearing a green dress.5. A: How many a_________ are there in the zoo?B: There are many animals.6. A: Can you p_________ some music?B: Yes, I can play the piano.7. A: Where are the k_________?B: They are on the desk.8. A: What are they s_________?B: They are swimming in the sea.9. A: What is he h_________?B: He is holding a basketball.10. A: How does the m_________ get water?B: It drinks water from the river.三、按要求完成句子。

PEP人教版四年级英语下册Unit 3 Weather同步练习一课一练随堂练习含答案(6课时)

四年级英语下册Unit 3 Weather 随堂练习含答案（6课时）Unit 3 Weather Part A （3课时）Part A 第一课时1. — What ’s the weather like in London? — It ’s ______(有风的).2.— Is it______? — Yes, it is.3. It ’s ______ (阳光充足的)in Sydney.4. — It ’s ______ (下雪的). — Let ’s make a snowman. 二、单项选择。

( ) 1. Can I_______ outside? A. go toB. goC. to( ) 2. — Can I have some soup? —_______ A. Yes, I can. B. Yes, I do. C. Yes, you can.( ) 3. — _______— It ’s 6 o ’clock.A. What time is it?B. Can I go outside?C. What ’s this?三、选择合适的句子补全对话。

Mum: 1.__________Zhang Peng: OK. Can I have some soup? Mum: 2._________Mum: 3.__________Zhang Peng: Can I go outside?Mum: No, you can’t. 4.__________答案：一、1.B 2.D 3.A 4.C二、1.B 2. C 3.A三、1.B 2. D 3.A 4.CUnit 3 WeatherPart A第二课时一、连一连。

1. 温暖的2.炎热的3. 凉爽的4.寒冷的A. coldB. coolC. warmD. hot二、单项选择。

( ) 1. It’s hot today. Can I ______my sweater?A. wearB. take offC. put on ( ) 2. Today is windy ______Kunming.A. inB. onC. at( ) 3. This is the ______report. It’s warm in Beijing today.A. EnglishB. weatherC. music ( ) 4. It ______so nice.A. feelsB. feelC. off ( ) 5. —______I go outside?—No, you can’t.A. DoB. CanC. Am三、选出下列单词的反义词。

精编新陕旅版四年级下册英语第三和第四单元课时练随堂练含答案

Unit 3 Is It Snowing? 第一课时一、看图，选择与图片对应的单词。

A.glassesB. snowC. windD. rainE. cloudF. raincoat1.（）2．（）3．（）4．（） 5.（） 6.（）二、根据中文释义，填写正确形式。

1．rain（现在分词）2．snow（现在分词）3．cloud（形容词）4．snow（形容词）三、超级小翻译。

1．雪人 2. 蓝色的天3. 在空中飞4. 一副眼镜四、选一选。

（）1. windy A. go swimming（）2. raining B. make a snowman（）3. hot C. raincoat（）4. snowy D. fly a kite参考答案一、1. D 2. B 3. E 4. C 5. A 6. F二、1. raining 2. snowing 3. cloudy 4. snowy三、1. snowman 2. blue sky 3. fly in the sky 4. a pair of glasses四、1. D 2. C 3. A 4. BUnit 3 Is It Snowing? 第二课时一、单项选择题。

（）1. Look the book on the desk.A. atB. inC. on（）2. , It's raining.A. WatchB. LookC. Listen（）3. Let go home.A. usB. isC. s（）4. — Is it raining?—.A. Yes, it isn'tB. No, it isC. Yes, it is（）5. — Is there a wind?—, It's snowing.A. YesB. NoC. OK二、看图选择正确的答案。

1.You need .A. glassesB. raincoatC. coatD. umbrella2.You need .A. glassesB. raincoatC. kiteD. bag3.You need .A. glassesB. raincoatC.coatD.umbrella三、读一读，按要求完成句子。

小学四年级英语随堂练习复习试卷及参考答案

小学四年级英语随堂练习复习试卷及参考答案满分：100分时间：60分钟友情提示：1.答第Ⅰ卷前，请考生细心将自己的学校、班级、姓名、考号填写在答题卡上。

2.答第Ⅰ卷时，每小题选出答案后，用铅笔把答题卡上的答案涂黑。

不能只答在试卷上。

第Ⅱ卷的答案，写在答题卷上。

3.考试结束后，将答题卷和答题卡交回。

第Ⅰ卷（选择题共80分）第一部分听力部分（共35小题，满分35分）注意：回答听力部分时，请先将答案写在试卷上。

听力部分全部结束后，再将你的答案转涂到答题卡上。

一、听句子。

（共10小题，每小题1分，共10分）将你听到的单词或词组的序号填在题前括号内，每题读两遍。

( ) 1. A. playground B. library C. garden( ) 2. A. pants B. socks C. shorts( ) 3. A. you B. your C. yours( ) 4. A. potatoes B. tomatoes C. carrots( ) 5. A. cold B. cool C. coat( ) 6. A. this B. that C. these( ) 7. A. cheap B. sheep C. pretty( ) 8. A. English class B. music class C. PE class( ) 9. A. How much B. How many C. How about( ) 10. A. put on B. put away C. take off二、听辨句子。

（共5小题，每小题1分，共5分）将你听到的句子的序号填在题前括号内，每题读两遍。

( ) 11. A. It’s on the first floor. B. It’s on the second floor.C. It’s on the third floor.( ) 12. A. It’s time for lunch. B. It’s time to eat lunch.C. It’s time to have lunch.( ) 13. A. I like this blue skirt. B. I like these blue skirts.C. I like this blue shirt.( ) 14. A. There are many cows at the farm.B.There are many hens at the farm.C. There are many people on the farm.( ) 15. A. Whose gloves are those? B. Whose glove is this?C. Those are my gloves.三、听句子，选图片。

小学四年级英语下册4B Unit2随堂练习

小学四年级英语下册4B Unit2随堂练习A卷: 课堂点拨题Story time1. (1)【易错】Let’s and table tennis. A.goes; plays B.go; plays C.go; play(2)Let’s go swim. A．/ B．play C．and(3)Let’s go and . A. play the table tennis B. play table tennis C. play tabletennis2.It’s Wednesday.(对划线部分提问)3.(1)I an apple and she some bananas.A.have; have B.have; has C.has; have(2)Wang Bing a Music lesson. A. has B. have C. haves(3)We a football match today. A. has B. have C. haves(4)Helen has a lesson this afternoon. A．swim B．swimming C．swims(5)【易错】I have a lesson this morning. A.run B.sing C.running4.(1)We don’t have lessons on Sundays. A．some B．any C．a(2)I have any lessons Tuesday. A．/ ; on B．don’t ; in C．don’t ; on(3)【易错】We don’t have any . A.English B.apples C.Maths(4)I have some lessons on Saturday.（改为否定句）I have lessons on Saturday.5. a pity！ A.What B.How C.WhenCartoon time1.(1)--When do you get up every day？-- . A. At 5:00 B. 5:00 C.It’s 5:00(2)I get up seven. A．in B．at C．on2. We often go to school at seven o’clock.(对划线部分提问) do often go to school?B卷: 课后巩固题一.选择1.-- Come and play table tennis，Helen. -- , I have an singing lesson now. A.Yes B.Sorry C.OK2.【易错】--Let’s and ! A.go；swimming B.goes；swim C.go；swim3.【易错】--We have an lesson this afternoon. –Great！I like to draw pictures.A. EnglishB.PEC.Art4. 【易错】Can you a cake? Yes, I like things.A．make; make B．make; making C．making; make5. do you get up? A．Where B．When C．What二．填入适当的词1.do(第三人称单数)2.swim(动名词)3.have(第三人称单数)4.do(否定形式)5.some(同义词)6.day(复数)7.we(宾格)8.match(复数) 9.go(第三人称单数)10. I have (some, any) pencils. Do you have (some, any) pencils?11. I eat (a, an) egg and (a, some ) rice (in, on) the morning.12. Helen (have, has) seven (subjects, lessons) (at, in) school.13. It’s time (for, to) school. Let’s go (for, to) school.14. This is _______ (we) timetable.15. I like _______( Art).16. How many __________ (mango) do we have?17. It’s Sunday. We _________ (have ) any lessons.18. Where ________ (be) your clock?三．翻译1.at five2.every day3.在星期一4.真遗憾！5.放学后6.一场足球比赛7.一节游泳课8.在七点二十9.每个男孩10.在星期天早晨11.去打篮球13.我们星期二下午有一节音乐课。

人教版,英语四年级下册,随堂检测

U1 My school AⅠ、选出最佳一项。

( )1.—Where’s the TV room ? —It’s on the _____ floor.A. oneB. first C .two( )2. —Is this the library ? —__________ .A. Yes, it isn’t.B. No, it is.C. No, it isn’t.( )3.Here’s ______ homework.A. myB. me( )4.—Where’s the teachers’ office? —It’s _____the library.A. toB. at C .next toⅡ、连线。

1. Go to the garden. Play football.2. Go to the teachers’ office. Read a storybook.3. Go to the playground. Water the flowers.4. Go to the library. Hand in the homework.Ⅲ、读一读，写一写teachers’ office libraryU1 My school BⅠ、精挑细选你最棒。

.( ) ( ) ( )( ) A. playground B. art room C. computer room D. music roomⅡ、根据所给情境选择正确表达。

( )1.你想问“那是计算机房吗? ” 可以说： _____A. Is this the computer room?B. Is that the computer room?( )2. 当你的家人来你的学校参观时，作为引路人，你会在前面指引道路，这时就用到了一句实用的英文：_______A. This way, please.B. It ’s on the second floor.( )3.你想赞美朋友的学校，可以说：______ (双选)A. Cool ！B. All right.C. How beautiful !( )4.当你想问对方的学校是否有花园时，可以问：_____A. Do you have a garden ?B. Do you have a music room ?Ⅲ、Look and write.（读一读，写一写。

精编PEP人教版四年级下册英语全册同步练习课时练习课课练含答案(含Recycle)

四年级下册英语全册同步练习含答案（含Recycle）目录：PEP人教版四年级下册Unit 1 My school 随堂练习含答案（6课时）PEP人教版四年级下册Unit 2 What time is it练习含答案（6课时）PEP人教版四年级下册Unit 3 Weather随堂练习含答案（6课时）PEP人教版四年级下册Recycle 1随堂练习含答案(2课时)PEP人教版四年级下册Unit 4 At the farm随堂练习含答案（6课时）PEP人教版四年级下册Unit 5 My clothes随堂练习含答案（6课时）PEP人教版四年级下册Unit 6 Shopping随堂练习含答案（6课时）PEP人教版四年级下册Recycle 2随堂练习含答案（2课时）四年级英语下册Unit 1 My school 同步练习含答案（6课时）Unit 1 My school Part A（3课时）Part A第一课时一、按要求写单词或短语。

1.two（序数词）___________2.teachers（名词所有格）___________3.w here’s （完整形式）____________4.紧邻（汉译英）____________二、单项选择。

人教PEP版小学英语四年级下册随堂练

最新人教PEP版小学英语四年级下册随堂练老师好帮手整理I. 看图，写单词，完成下列句子。

（10%）1. This ball is _______ .That ball is _______2. This skirt is . That dress is----------- -----------------------------------------3. This sweater is seventy-nine yuan. It ' s too ______II. 选择填空。

(20%)( )1. —_____ are those banan as?—Thirty yuan.A. How manyB. How muchC. How( )2. —How much are they?— _____ twenty yua n.A. They areB. It isC. I have( )3. There ____ a pair of sn eakers.A. isB. areC. am( )4. Look _____ the dress. It ' s pretty.A. atB. forC. in()5. This skirt is pretty. I ' ll ___ it.A. takeB. goC. giveIII. 选择适当的单词，完成对话。

(30%)Boy: Mom, look at the sweater. It 1 .' sMom: Yes, 2_」t ' s very3 .Assista nt: 4 .Mom: How much is the 5 .Assistant: It ' syuahtyMom: It ' s toc6 .Boy: OK, let ' s go home.Mom: Sorry, my boy.A. expe nsiveB. Can I help you?C. it isD. prettyE. colorfulF. sweate参考答案：I. big ,small 2. Short,long 3. expensiveII. 1. B 2. A 3. A 4. C 5. CIII. 1 . E 2. C 3. D 4. F 5. AI. 选择不同类的单词。