搜档网
当前位置:搜档网 › 八年级英语How-often-do-you-exercise单元测试题

八年级英语How-often-do-you-exercise单元测试题

八年级英语How-often-do-you-exercise单元测试题
八年级英语How-often-do-you-exercise单元测试题

Unit 2 How often do you exercise

I. 选择填空(共20分)

() 1. —How often ______ Mary exercise?

—Twice a week.

A. do

B. does

C. doing

D. did

() 2. Good food and exercise ______ me to study better.

A. help

B. helps

C. helping

D. to help

() 3. Is her lifestyle the same ______ yours or different?

A. as

B. in

C. at

D. to

() 4. I have a tennis and my friend John ____ two tennis rackets.

A. have

B. play

C. plays

D. has

( ) 5. Scott watches TV once ______ week.

A. a

B. the

C. an

D.﹨

( ) 6. Please drink some milk. It’s good ______your health.

A. to

B. for

C. at

D. with

( ) 7. Katrina couldn’t go to the cinema with us because she had to _____ her little brother.

A. look for

B. look after

C. look at

D. look into

( ) 8. ______I have one healthy habit, ______I’m not very healthy.

A. Although , but

B. Although, /

C. Although ,so

D. but , /

( ) 9. Let us talk about the difference ______Chinese and English names.

A. on

B. of

C. between

D. With

( ) 10. Larry's mother wants him _____ at home today.

A. stays

B. stayed

C. to stay

D. staying

II. 完型填空(10分)

My name is Katrina. I’m ___1____ American girl. I’m twelve ____2___. I live ____3___the center of California. I live in a flat ___4___ a busy street. The flat is not very large. My favorite room is the ___5___ room. After dinner, I like __6___ music and watch TV there. Sometimes, I chat __7___ my parents. I share a bedroom with my sister Cathy. Cathy is only six. She can’t read ___8___ write. But she has ___9___ toys. Our neighbors are very___10___ and helpful. We’re happy there.

( )1. A. a B. an C. / D. the

( ) 2. A. years B. year old C. years old D. year-old

( ) 3. A. at B. for C. on D. in

( ) 4. A. on B. to C. at D. behind

( ) 5. A. live B. living C. lives D. lived

( ) 6. A. listen B. listening to C. to listen D. to listen to

( ) 7. A. with B. to C. for D. in

( ) 8. A. and B. with C. or D. while

( ) 9. A. a lot B. a lots C. a lot of D. a lots ( )10. A. friend B. friends C. unfriendly D. Friendly IV. 根据括号内所给单词的适当形式填空

1. My brother’s _____(wtite) habits are not good.

2. My mom goes shopping _____(two) a week.

3. Julia tries _____(eat) a lot of vegetables and fruit.

4. On weekends, I have to help my mom _____(clean) the house.

5. _____(not) run after meals.

6. There are many ______(different)between the two books.

7. This movie is very ______(interest)

8. My mom wants me______(drink)milk every day.

9. Victor usually______ (have)meat and vegetables for dinner now. VII. 连词组句

1. what, usually, you do, on, do weekends?

________________________________________?

2. how often, your brother, does, take, a, shower?

_________________________________________?

3. I, nine , hours, sleep, every , night.

_____________________________________.

4. Betty, milk, drinks, every, morning.

____________________________________.

5. some, students, once, watch, TV, or, twice, a, week.

_______________________________________________.

参考答案:

听力答案

I. EABCD II. ABCAC III. ACACB

听力材料

I.1. My brother sometimes goes swimming.

2. I often go out for a trip.

3. My friend usually goes skating.

4. My teacher often plays ping-pong after class.

5. My sister goes boating on Sundays.

II. 6. What do you usually do on weekends, Mary?

7.Do you often eat junk food?

8.How often do you play sports?

9.How many students in your class come to school by bus?

10.What sports do you often do?

III. Tom often exercises in the morning. He usually walks two miles after he gets up. He does homework and plays soccer after school five times a week. He never watches TV. He plays computer games once a week. He likes eating fruit and vegetables. And he eats them everyday. Tom is healthy and he is a good student. Everyone loves him.

笔答部分

I. 1-5 BAADA 6-10 BBBCC

II. 1-5 BCDAB 6-10 BACCD

III. 1-5 A B D A C

IV. 1. writing 2. twice 3. to eat 4. clean/to clean 5. Don’t6. difference 7. interesting 8. to drink 9. has 10. does, read

V. C F E G A

VI. FCEAHBGD

VII. 1. What do you usually do on weekends?

2. How often does your brother take a shower?

3. I sleep nine hours every night.

4. Betty drinks milk every morning.

5. Some students watch TV once or twice a week.

VIII. Vince usually has breakfast at 6:30 at home. He liked to eat fast food before, but now he changes his diet. He has some milk, bread and eggs for breakfast. He has lunch at 12:00 at school. He often has a bowl of rice, some meat and vegetables. Sometimes he has some fish. He usually has supper with his family. He is healthier than before.

八年级英语期末试题

八年级下册英语期末试题 (120分)姓名 Ⅰ. 单项选择。(15分) ( )1. China is ____ beautiful ____ many foreigners want to visit it. A. so; that B. so a; that C. such; that D. such a; that ()2. Beijing Opera sounds ____. Many old people like it. A. beautifull y B. beautiful C. well D. badly ()3. Judy said that she ________a nice skirt in Beijing. A. buy B. buys C. bought D. buying ( )4. —Does Ted tell you ____ he will come next week? —No, he doesn’t. But ____ he comes, I’ll give you a ring. A. if; whether B. whether; whether C. if; if D. if; until ( )5. —How careful Jim is! —He writes ____ in our class. A. more careful B. most carefully C. most careful D. more carefully ( )6. The menu has so many good things! I can’t decide ____. A. what to eat B. how to eat C. where to eat D. when to eat ()7. ---Would you like ___bowl of rice? ---No,thanks. A. other B. another C. the other D. others ( )8. The girl wanted to make a lot of money ____ she could buy the silk cheongsam. A. and B. but C. so that D. because ( )9. In summer, we often have fun ____ in the river. A. to swim B. swims C. swam D. swimming ( )10. Tom said he ____ at that time. A. is cooking B. cooked C. was cooking D. cooks ()11. Look !Here ____! A. the bus come B. come the bus C. comes the bus D. the bus comes . ( )12. The policewoman stopped the man from ____ something bad. A. do B. doing C. does D. will do ( )13. —It’s necessary ____ our environment. —I agree with you. A. protect B. protecting C. to protect D. protects ( )14. There ____ a food festival next Wednesday. A. has B. have C. is going to have D. is going to be ( )15. Yesterday Mr. Wang told us the earth always ____ around the sun. A. to go B. goes C. went D. going Ⅱ. 情景交际。(20分) (A)根据对话情景选择恰当的选项。 A. Here you are. B. Would you like some

(参考)2019年八年级英语阶段质量检测抽考试题外研版

(参考)2019年八年级英语阶段质量检测抽考试题外研版 一.阅读理解 A India has a population of 1.27 billion. Its population is the second largest in the world. China has the largest population of over 1.36 billion. One out of six people on this planet live in India. Although, the crown (王冠) of the world’s most populous (人口稠密的) country is on China’s head for ten years. India will take the position by 2030. With the population growth rate (率) at 1.58%, India will have more than 1.53 billion people by the end of 2030. Now more than 50% of India’s population is below the age of 25 and over 65% below the age of 35. About 72.2% of the population lives in some 638,000 villages. Some of the reasons for India’s quickly growing population are poverty, illiteracy (无知), decrease in death rates and immigration (移民) from Bangladesh and Nepal. India started taking measures to stop the growth rate quite early. India had the “National Family Planning Program” in 1952. It became the first country in the world to have a population policy. However, it failed to reach the final goal (目标). 1. The population of India is now. A. 1.58 billion B. 1.53 billion C. 1.36 billion D. 1.27 billion

初二英语期末试卷及答案

2012学年初二期末英语试卷及答案 本卷共五大题,满分100分。 一、单项选择(本大题共10小题,每小题1分,共10分。) 从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。 ( ) 1. ---Which ball game do you like better, basketball or baseball? --- _______. I love table tennis. A. Both B. Neither C. Either D. Each ( ) 2. —I am allowed to hang out with friends on weekends. —_____. A. So should I B. So can I C. So am I D. So do I ( ) 3. --- Could you tell me you’ll be away ? --- Only one week. A. how much B. how soon C. how often D. how long ( ) 4. Do you know ? A.how old is Jack B. Where does he live C. when was Jack born D. Who cleaned the room ( ) 5. ______nice weather we have today ! ----Let’s go hiking . A. How a B. What a C. How D . What ( ) 6. Tom never smiles , dose he ? ----- _______. He is always serious . A. Yes , he does B. No, he doesn’t C. Yes, he doesn’t D. No , he does ( ) 7. —I think we teenagers _____ to make every decision by ourselves. —I disagree, we are still young and need our parents’ and teachers’ help. A. should allow B. must allow C. should be allowed D. may be allowed ( ) 8. The old man______since two years ago. A. died B. had died C. has been dead D. had been died ( ) 9. My grandpa often feels _____ at noon, so he will have a rest at that time every day. A. asleep B. sleepy C. awake D. energetic ( ) 10 ---It seems that my friends don’t understand me. --- Don’t worry. I’m sure you will _____ them if you are friendly to them. A. get along well with B. catch up with C. agree with D. end up with 二、完型填空。(本大题共15小题,每小题1分,共15分。) 阅读下面短文,然后在各题所给的四个选项中选出一个最佳选项。 The teacher stood before his class and was going to hand out the final exam papers. “I know how ___ (11) you have all worked to prepare for this test,” he said. “And because I know you can do it well, I am willing to offer a B to anyone who would ___ (12) not to take the test.

(完整word)八年级英语期末试卷

八年级英语试题卷 2019.01 考生须知: 1、试卷分为试题卷(共8页)和答题卷(共2页);满分为100分;考试时间为90 分钟。 2、所有答案写在答题卷上,做在试题卷上不得分;请勿在装订线内答题。 3、请在答题卷装订线内写上考生所在班级、姓名、试场号、座位号。 听力部分(20分) 第一节:听小对话,选择正确的图片,每段对话仅读一遍。(每小题1分,共5分。)1. What is the woman making? A. B. C. 2. What does Tim want to be? A. B. C. 3. What will the girl do if she goes to the old people’s home? A. B. C. 4. Where is Miss Li from? A. B. C. 5. Which cinema has the biggest screen? A. B. C. 第二节:听小对话,选择正确的选项,每段对话仅读一遍。(每小题1分,共5分。) 6. How many people did Dave invite to his birthday party? A. Four. B. Three. C. Two. 7. What kind of TV show will the boy watch? A. A game show. B. A talent show. C. A talk show. 8. What was the weather like yesterday? A. It was rainy. B. It was sunny. C. It was snowy. 9. How will they get to the theater? A. By bike. B. By car. C. By bus. 10. What did Tom do on Sunday? A. He learned how to swim. B. He watched a swimming game. C. He swam with his brother.

八年级英语测试卷(附答案)

( ) 1.—Look! There is ________ orange under ________ tree. —Let’s go and pick it up. A. a, the B. an, the C. an, a D. the, the ( ) 2. There are 3 erasers on the table. ________ one is yours? A. What B. Which C. Whose D. Who’s ( ) 3. I have a sister. ________ is an English teacher. This English book is________. A. Her, Hers B. Her, her C. She, her D. She, hers ( ) 4. — Linda, when shall we take a walk? —After I finish my homework. A. check B. check C. to check D. checking ( ) 5. —My grandfather is ill. — ________ . A. Sorry B. Excuse me C. That’s too bad D. I’m sorry to hear that ( ) 6. Behind the door _________ some apples. A. is B. are C. be D. / ( ) 7. —Can I help you, madam? —I’d like a kilo of ________ . A. milk B. cake C. banana D. apple ( ) 8. School ________. Let’s go home. A. begins B. is off C. is over D. is over there ( ) 9. —________ is your new bike? —1,000 yuan. A. How many B. How much C. How about D. Where ( ) 10. Do you read English ________? A. every morning B. in morning C. on every morning D. in every morning ( ) 11. Mrs. Green comes from ________. A. English B. American C. Australia D. Japanese ( ) 12. Best wishes ________ New Year’s Day and best wishes ______ you. A. to; for B. to; to C. for; for D. for; to ( ) 13. It ________her three weeks to study lessons. A. spends B. cost C. waste D. takes ( ) 14. I hope ________ go to the park with me next week. A. her to B. her C. / D. she will ( ) 15. He at painting, but he doesn’t in playing chess. A. is good, does well B. does well, is good C. is good, do well D. do well, is good ( ) 16. I will go to the hospital this afternoon. There is_______ with my nose. A. nothing wrong B. wrong nothing C. anything wrong D. something wrong ( ) 17. —________ you cross the street every morning? —No. But I _________ it this afternoon. A. Do, do B. Do, will do C. Will, do D. Will, will do ( ) 18. —________ do you like eating? —I like eating rice, meat and all kinds of vegetables. A. How much B. How many C. What D. How ( ) 19. _______ late for music class again next time, . A. Don’t be B. Be not C. Not be D. Don’t ( ) 20. I think Dick can __________ his camera in the lost and __________ office. A. find, find B. finds, finds C. find, found D. found, find

人教版八年级英语下册6—8单元测试题

人教版八年级英语下册抽考测试题 姓名班级得分 I. 写出下列单词的适当形式(15分) 1. be(过去分词) 2. more than(同义词) 3. probably(同义词) 4. bring(过去式) 5. polite (反义词) https://www.sodocs.net/doc/5a198481.html, (形容词) 7.return(同义词)8.person(形容词)9.mouse(复数)10. pronunciation(名词)11.win(名词) 12.give(过去分词) 13.behave(名词)14.eat(过去式)15.much(最高级)II. 根据首字母或汉语意思完成句子,使句意完整.(5分) A. pla nts B. have bee n pla nting C. has bee n pla nting D. has bee n pla nted ( )7. Mr. Li _____ swim ming for 3 hours, and his son ____ an hour ago. A. has bee n; started B. have started; has started C. started; started D. has started; has started ( )8. —How long have you bee n there? — __________ . A. Once B. For two years C. Si nee two years D. Twice a year ( )9. I'd like __________ because it's in teresti ng. A. skati ng B. to skate C. skate D. skates 1. The skati ng maratho n has bee n going for five hours now, and s________ skaters are still skat ing. 2. Hele n likes to call me at ni ght. I can 's it. 3. Please keep your voice dow n in p places if possible. 4. People might feel (不舒服的)if you cut in line. 5. Mary has bee n liv ing here s 10 years ago. III. 选择填空。(20分) ( )1. There _____ a pair of sport shoes un der the bed. A. are B. is C. have D. has ( )2. If you _____ your homework, we 'lgo to the movies toni ght. A. will fin ish B. fin ish C. fin ishi ng D. fini shes ( )3. We ______ 1000 En glish words since we _____ to this school. A. lear n, come B. have lear ning, came C. have bee n lear ning, came D. have lear ned, come ( )4. We have run _______ rice, we will have to buy some this after noon. A. out B. of C. out of D. out to ( )5. He is in terested in _______ En glish son gs. A. to collect B. collect C. collect ing D. collected ( )6. The child _________ trees for the whole four hours with his pare nts. ()10. Have you ever ___________ the Great wall? A. bee n to B. gone to C. go to D. bee n ( )11. Zhang Li is always the last _________ home. A. get B. to get to C. leave D. to leave ( )12. I n Great Britai n it isn 'polite _________ from each other 's plate. A. eat B. to eat C. eati ng D. for eati ng ( )13. That bag isn 'm in e. It may be ___________ . A. somebody 's B. somebody else C. somebody 's else D. somebody else 's ( )14. They have bee n skati ng __________ . A. for three hours ago B. since three hours ago C. three hours ago D. since three hours ()15. __________ , what's your hobby? A. I n the way B. On the way C. To your way D. By the way

八年级英语期末考试试卷

八年级英语期末考试试卷 班级姓名学号成绩_________ 第一部分:听力试题 一、听力选择 A)句子理解,选择与所听句子意义相近的答案,句子读两遍。(5%) 1、A、My mother is a worker、 B、My mother is a teacher、 C、My mother is a doctor、 2、A、Tom doesn't like eggs at all、 B、Eggs are Tom's favourite food、 C、Tom usually has eggs for breakfast、 3、A、Lucy does well in Chinese、 B、Lucy can’t speak Chinese at all、 C、Lucy doesn’t study Chinese、 4、A、I went to the party first, and then, the cinema、 B、I went to the party, not the cinema、 C、I didn't go to the party, instead, I went to the cinema、 5、A、 We arrived after two o'clock、 B、We arrived at two o'clock、 C、We arrived before two o'clock、 B)对话理解,根据所听对话选择正确答案,对话读两遍。(5%) 6. A、Jack B、Simon C、Amy 7、A、Seven hours B、Six hours C、Eight hours 8、A、Comfortable B、Exciting C、Terrible 9、A、It’s raining、B、They’re coming home、C、There’s going to be a storm 10、A、Go to the theatre with the man B、Go out with his grandfather C、Stay at home C)短文理解,根据所听短文选择正确答案,短文读两遍(5%) 11、An elephant can see something clearly if_________、 A、it is big enough B、it is close to it C、it is in the daytime 12、There are ________ elephants in the world、 A、only two kinds of B、more than two kinds of C、three kinds of 13、It is _________ for people to catch the elephants in Africa、 A、easy B、pleasant C、difficult 14、In the story, ___________ are able to know people’s voice、 A、elephants B、the elephants in Africa C、the elephants in India 15、The elephants in India are _______ the elephants in Africa、 A、cleverer than B、different from C、not so clever as D)短文填空,根据所听短文填入所缺的单词,短文读两遍。(5%) Killing and____16____ wildlife is a great problem these days、We must take ___17___ as soon as ____18____、Everyone can do something, I think、 First, I think it’s ___19____ to stop people from cutting down trees in order to protect the living ___20____ of wildlife、Second, people should not hunt wildlife for their ___21___、I also think it’s bad to wear____22_____、But the most important thing is that we should tell more people the___23____of ____24___ wildlife、If we do nothing, there will be no wildlife in the ___25___、So let’s begin to do something to help before it’s too late、

八年级英语测试题及答案

初二英语期末模拟试题 满分:75分考试时间:70分钟 第Ⅰ卷选择题(45分) 一.单项填空(30小题,计15分) A)选择适当的词语替换句子中的划线部分。 ( )1.Tom walks to school every day. A. on foot B. goes to C. goes to … on foot ( )2.There are over 50 students in our class. A. about B. more than C. around ( )3.We had a good time in the park yesterday. A. enjoyed myself B. have fun C. enjoyed ourselves. ( )4.Finally they arrived there after a long journey. A. At the end B. In the end C. At the last ( )5.I got a letter from my friend last week. A. received from B. heard from C. heard a letter from B)从A、B、C三个选项中选出能填入空白处的答案。 ( )6. “____ do you surf the Internet?” “Once a week.” A. How soon B. How often C. How long ( )7.The students in this school have P.E. class once ___ twice a week.

精选八年级英语上学期期末评估抽测试题人教新目标版

2016年八年级英语抽测试题 注意:请将答案填涂或填写在答题卡相应的位置,答在本试题卷上者不得分。 一、单项选择(共20小题,计40分) 1. _______man in the photo is ________ engineer. A. A; a B. The; an C. An;the D. The; a 2. —When did he arrive________Beijing? —He got there May 12th. A. in; in B. at; in C. to; at D. in; on 3. Students shouldn’t go to school breakfast. It’s bad for their health. A. without B. with C. on D. by 4. _______ you work harder, you won’t get better grades. A. Unless B. So C. Because D. As long as 5. We speak to the Japanese repeatedly that Diaoyu Islands are ours but not ________. A. they B. them C. theirs D. their 6. When ________ your little sister born? A. is B. was C. are D. were 7. — ______ are you going to the movies with? —My friend, Tony. A. Who B. Where C. When D. What 8. —If there are ________ people driving cars, there will be ________air pollution. —Yes, the air will be fresher and cleaner. A. less; less B. less; fewer C. fewer;fewer D. fewer; less 9. There _________ a talk show on CCTV-3 at eight tomorrow evening. A. has B. will have C.is going to have D.will be 10. This new machine can make you ______better soon. A. to feel B. feeling C. feel D. feels 11. We _____ the soccer team from No.2 Middle School and ________ the ma tch. A. beat; won B. won; beat C. won; won D. beat; beat 12. Please peel two b ananas and then_________. A. cut up it B. cut up them C. cut it up D. cut them up 13. There are _______ students in the primary school.

八年级英语期末测试卷

八年级英语清北班测试卷 一、选择题 1,Did you hear _____ just now? A . a noise B. noise 2,I can’t work here. There’s too ____. A. many noises B. much noise 3, If you want to know the news in detail, you can buy ____ to read. A. A paper B. paper 4, I need some ____ to write on. A . paper B. paper 5, There is ____ in my soup! A.Hair B. a hair C. hairs 6. –Oh! There isn’t enough ____ for us in the bus. -- No hurry. Let’s wait for the next. A.place https://www.sodocs.net/doc/5a198481.html,nd C.room 7. –How can I tell one tree from another? -- You can mostly tell them by the ___ of their leaves. A. shape B.size C.age 8.They got much ____ on the Internet. A. photo B. ideas C. information 9. -- Would you like some ___? –No, thank you. I’m not hung ry at all. A. tea B. water C. bread 10. _____ it was yesterday because of the storm! A. What bad weather B. What a bad weather C. How bad a weather 11. –I don’t know how to use this machine. -- It doesn’t matter. Here is the ____. A. instruction B. direction C. information 12.Samaranch, who is _______ old friend of Chinese people, died on April 21, 2010. A, a B, an C, the 13, --- May I have a look at ______ book tonight? --- Of course, you can. I have ______ old one at home. A, the ; a B a; the C, the; an 14, --- Bob, you look so happy today! --- Well, I got _____ A on my English test. A, the B,a C,an 15, --- What’s _____ most useful invention in the 20th century? --- _______ computer, I think. A, the ; A B, a ; A C,the; The 16, I’m expecting a pet dog for long, but mom has no time to buy ______ for me. A, it B, one C, this 17, ---- Which would you like to visit, Shanghai Expro Garden or Beijing Bird Nest? ---- ________. I prefer to enjoy the 2010 FIFA World Cup at home. A, Both B, Either C, Neither 18, It’s difficult for me to decide which one to choose, because _____ of them are good. A, neither B, both C, each

外研版八年级英语期末测试题

笔试部分(75分) VI. 单项选择(共15小题,每小题1分,共计15分) 26. Jack wants to be ________ engineer when he grows up. A. a B. an C. the D. / 27. Children usually enjoy ________ computer games. A. play B. plays C. playing D. played 28. The place was ________ beautiful ________ we didn’t want to leave. A. such; that B. too; to C. so; that D. much; to 29. We must work hard. There ________ an important exam next month. A. will have B. is going to have C. will be D. has 30. Their factory is very large. Every year _________people go to visit it. A. thousand B. two thousands C. thousand of D. thousands of 31. ---________ do you have a sports meeting at your school? ---Every year. A. What time B. How long C. How far D. How often 32. I want to go ________ for my winter vacation. A. somewhere different B. different somewhere C. anywhere different D. different anywhere 33. Mary will go to Beijing if she ________ a five-day trip. A. have B. had

八年级英语测试题(附答案解析)

一、单项选择 1. Lucy look _________Lily. They are _____________ A. like, like B. like , alike C. alike , like D. alike , alike 2. The number of the cranes is getting ________. If we don’t help them, they will disappear ______a few years A. fewer and fewer, in B. larger and larger, after C. more and more, after D. smaller and smaller, in 3. I’m ________ to see the baby’s ________ ability in music. A. amazing, amazing B. amazing, amazed C. amazed, amazing D. amazed, amazed 4. ----How did he finish the work?----I hear that he did it __________ A. in the own B. on his own C. of the own D. all his own 5. The ______ of living areas makes wild animals become fewer than before A. loss B. lost C. losing D. lose 6. People make medicine _______tigers’ ____________ A. of bones B. with, bone C. on , bone D. from ,bone 7. Do you know how many people ______ the big fire last week? A. lived B. survived C. stayed D. continued 8. Of the two American students , Lily is _____________ one. A. tallest B. the taller C. taller D. the tallest 9. We can’t win the match ________your support. A. without B. with C. under D. for 10. Daniel is my friend. I like sharing my _________ with him when I am happy. A. joy B. happy C. sad D. secrets 11. ---Which book can I take? ---You can take ____ book you like. A. both B. any C. no D. all 12. His grandfather is over 85, _________ he is very healthy. A. and B. but C. or D. so 13. –Are these cars made in Japan? ---Yes. And they’re much cheaper than _______ in America. A. that B. those C. it D. ones

相关主题