第三讲数词(小升初专项讲义及练习)

数 词

本讲内容

内容 数词 1. 2. 基本要求 数词的分类 数词的用法 一般过去时 新概念二第3课 课前测试

1.Could you tell us how to read the number 18,306,211?

A. eighteen million, three hundred and six thousands, two hundred eleven B. eighteen million, three hundred and six thousand, two hundred and eleven C. eighteen millions, three hundred six thousands, two hundreds and eleven D. eighteen thousand, three hundred and six, two hundred eleven 2.Shakespeare was born in ______。

A.1660s B.1660‘s C. the 1660s D. the 1660‘s 3.Bill said they were going to have _____ holiday。

A. a two-weeks‘ B. a two-week C. two weeks‘ D. two weeks 4.Over ______ of the articles on education have been published。

A. two thirds B. two third C. seconds three D. seconds third 5.My father left home at about 。

A. six thirty B. thirty six C. thirty to six D. six past thirty

语法考点

数词

表示数目多少或顺序多少的词叫数词，数词分为基数词和序数词。表示数目多少的数词叫基数词；表示顺序的数词叫序数词。英语的数词可以作句子的主语、宾语、表语和定语。 1. 基数词 基数词的构成

规则 1—12的基数词是的单词 举例 one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve 特殊 13—19的基数词以-teen结尾 20—90的整十位均以-ty结尾 fourteen, seventeen sixty, ninety 13，15，18较特殊：13—thirteen 15—fifteen, 18—eighteen 20, 30, 40, 50, 80较特殊： 20—twenty, 30—thirty, 40—forty 50—fifty , 80—eighty 十位数与个位数之间要加连字符28—twenty-eight, 号―—‖ 96—ninety-six 百位和十位之间加and 148—one hundred and 若无十位则和个位之间加and forty-eight hundred（百），thousand（千）million（百万）， billion（十亿） three hundred, seven thousand, four million, eight billion hundred, thousand, million用复数形式修饰名词时要用―of＋复数名词‖ 巧记口诀

巧记 100 以内的基数词

基数词，不难记，找清规律很容易，十二以内词各异； 十三数到十九去，后加 -teen，莫忘记； 二十三十至九十，整十之后有 -ty / ti /； 要说基数―几十几‖，连字符号―-‖别丢弃； a hundred 是―一百‖，请你记住别大意。

热身练习

用适当的数词形式表达下列数字。

1. 2:10 2. 8:30___________________________ 3. 12:40 ___________________________ 4. 10:15___________________________

5. 1990年8月15日_______________________ 6. 2008年9月10日_______________________ 2. 序数词

英语的序数词基本变法：

1）一般在基数词后加th。如：six—sixth

2）以-ve结尾的改为ve为-f再加th。如：five—fifth

3）以-ty结尾的改为ty为-tie再加th。如：twenty—twentieth 4）熟记特殊词。如：one—first，two—second，three—third 注意：

(1) 两位以上的序数词仅个位数部分用序数词，其余部分仍用基数词。 如：thirty-sixth

(2) 使用序数词时一般加定冠词the。 如：I'm in the third grade

(3) 序数词作―几分之几‖讲时，用复数形式。 如：1/5→one fifth

2/3→two thirds

4/7→four sevenths

热身练习

写出下列基数词的序数词形式。 four→ fourteen→

three→ eighteen→

five→ thirteen→ fifty-five→

twenty-one→

3. 数词的用法 1）表示年份

thirty-three→ one hundred and five→ two hundred and forty-four→

如：2002: twenty thousand and two

1976: nineteen seventy-six 2002年11月8日: Nov. 8th, 2002 8：30 → eight thirty 或 half past eight

2）表示日期

如：12月1日: Dec.1st 或 the first of December 3）表示时刻

如：5：15 → five fifteen 或 a quarter past five 10：45 → ten forty-five 或 a quarter to eleven 4）表示编号

如：Room 105 → Room one zero five

Bus No.13 → Bus Number Thirteen

P.5 → Page Five

Tel.No.7658659 →Telephone Number seven-six-five-eight-six-five-nine 5）―半‖的表达 如：1/2→ half 半小时→ half an hour 1.5 小时→ one and a half hours 或 one hour and a half 6）百分数用percent表示。 如：forty percent百分之四十

three percent百分之三 7）小数的读法

如：5.7→ five point seven 0.16→ zero point one six 8）表达算式

英语中加、减、乘、除的读法主要有以下几种。 如：5+6=11 读作：Five and / plus six is / are / make(s) / equal(s) eleven.

11-5=6 5x6=30

读作：Eleven minus five equals / is / makes / six.

读作：Five times six is / are / make(s) / equal(s) / thirty.

9）基数词的特殊用法

表示―几十年代‖或―几十岁‖时，用逢十的基数词的复数形式。 如：in the 1990's 20世纪90年代

in one's twenties在某人20多岁时

4. 序数词中不用the或省略the的情况 1）序数词前有物主代词时

如：This is my twenty-fourth birthday. 这是我的第二十四个生日。 2）用于固定搭配

如：from first to last从头至尾

at first当初

3）表示―又一，再一‖时。

如：I‘ll try a second time and see if I can do it. 我还要试一次看看我能否做得了。

热身练习

英译汉。（ 注意不同的表达法 ） 1. the Second Lesson / Lesson Two / Lesson 2 2. the Seventh Book / Book Seven / Book 7 3. Bus No. 332 4. Room 2110

5. ten meters deep

6. twenty kilometers long 7. once a week 8. twice a month 9. three times a year 10. five to eight

拓展训练

一、单项选择。

1. These books are for . A. we three B. three we

C. us three

D. three us

2. Our summer holiday is coming. Two the students in our school will go to the beach. A. hundred B. hundreds C. hundred of D. hundreds of 3. ---Where is the head teacher? ---Maybe he is in . A. Two Room B. the Two Room 4. ---Excuse me. Where is Mr. Green‘s office? ---It‘s on floor. A. seven B. the seven C. the seventh 5. Today is April . stst

A. 21th B. a 21th C. 21 D. a 21

二、词型转换。

1. They live on (eight) floor.

2. Please take (one) turning on the left. 3. (nine) month is September. 4. I will learn (five) unit.

5. (two) runner is a winner.

6. The meeting will be finished on October the (thirty-three). 7. December is the (twelve) month of the year.

8. Look at the photo! The (eleven) man from the left is our class teacher, Mr. Wang. 9. Do the twins sit on the (three) row?

10. ---Is Thursday the (seven) day of the week? ---No, it isn‘t.

D. seventh

C. Rooms two D. Room Two

三、改错。

1. There are three hundreds people in our village.

2. About four fifth of the books in our school library are written in Chinese. 3. He is the four tallest in our class. 4. Let‘s learn Lesson five. 5. The boy is 1.5 metre tall.

新二第3课

Please send me a card Postcards always spoil my holidays. Last summer, I went to Italy. I visited museums and sat in public gardens. A friendly waiter taught me a few words of Italian. Then he lent me a book. I read a few lines, but I did not understand a word. Everyday I thought about postcards. My holidays passed quickly, but I did not send cards to my friends. On the last day I made a big decision. I got up early and bought thirty-seven cards. I spent the whole day in my room, but I did not write a single card! New words and expressions 1. postcard n. 明信片 greeting card 贺卡

business card 名片 Christmas card 圣诞卡

★2. spoil (spoilt, spoilt v. 使索然无味，宠爱，溺爱 spoiled, spoiled） 谐音记忆：撕破了→损坏，破坏 3. museum n. 博物馆

museum= m-use-um (两边加起来是mum, 中间是use) the British Museum 大英博物馆→ historical museum 历史博物馆 industrial museum 工业展览馆

4. public a. 公共的，公开的，公众的

public=pub-lic (pub酒吧，公开的地方)（pub为词根,表示―公共‖） public place 公共场所 public library 公共图书馆 public service 公共服务 public house 酒馆

in public 公开地，当众

I don‘t want to speak about it in public. 我不想当众说这件事。

5. friendly a. 友好的

friend / friendship / unfriendly make friends

environmental friendly

He is friendly to us all. ★6. a few

可与复数可数名词连用，表示肯定，含有some, a small number of（一些，少数几个）的意思： The police would like to ask him a few questions.要问他一些问题。 Mother is coming in a few days.妈妈过几天就要来了。 同时扩展：few/a little/little 的用法

★7.Then he lent me a book. 之后还借给我一本书。

像send, buy, give等动词一样，lend可以有两个宾语：一个直接宾语（通常指物），一个间接宾语（通常指人）。在这句话中，lend的直接宾语为a book，间接宾语为me。 Would you lend me your pen?

Yesterday I lent my dictionary to Mary. 扩展lend/borrow

8. think about 考虑，思考

think of 考虑；思考 (= think about)

think better / highly / well of sb. 对某人印象好；看重某人 think little / poorly of看轻；看不起

think out想出；想通；想透；仔细考虑 (= think over) ★9.decision n. 决定

decision= de- cis (切) - ion（名词后缀） make a big decision 做出一项重大决定

come to / arrive at / reach a decision decide to do sth.

She could not make a decision about the dresses. 她对（买不买）这衣服下不了决心。 It was not easy for me to make/ take this decision. 对我来说作出这项决定并不容易。 You have made/taken a wrong decision.你作出了个错误的决定。 Have you made/taken a decision? 你决定了吗？ 10. whole a. 整个的

hole n. 洞（发音相同）

on the whole 总的来说，从总体上看 as a whole 作为一个整体， 总的来说

The whole of that area knew the whole truth from the whole story. 11.single a. 唯一的， 单一的， 单身的 a single bed a single ticket I didn‘t see a single person in the room. He is over fifty and remains single.

★ 本课的语法：一般过去时

1）表示过去某个特定时间发生的动作或存在的状态。 如：He suddenly fell ill yesterday. 昨天他突然生病了。

The engine stopped because the fuel was used up. 发动机因燃料用光而停机了。 2）表示过去经常发生的动作或存在的状态。

如：I wrote home once a week at college. 我上大学时每周给家里写一封信。 He was already in the habit of reading widely in his boyhood. 他童年时就养成了广泛阅读的习惯。 3）表示过去连续发生的一系列动作。

如：She entered the room, picked up a magazine and looked through it carefully. 她走进房间，拿起一本杂志，认真地翻阅了起来。

The students got up early in the morning, did morning exercises and then read English aloud in the open air.

学生们很早起床，做早操，然后在室外朗读英语。

1

练 习

1 Please give __________．

A to me it B it to me C me to it 2 I wrote __________.

A letter my uncle B a letter my uncle C my uncle letter 3 I __________ Mary ﹩300 last week.

D to it me

D my uncle a letter D lend

A lent B borrowed C borrow 4 Before Christmas my parents buy _________.

A me many presents B much present me C many presents me D me much present 5 Please pass _________.

A the salt me B me the salt C to the salt me D to me the salt 6 She sent a message __________ yesterday. A in me B me to

C me in

D to me

随堂巩固

一 单项选择

1 –Where ________ my book? I can‘t see it anywhere. –I _________ it right here, but now it‘s gone.

A had you put, was putting B were you putting, have put C did you put, have put D have you put, put 2 My sister likes to keep everything _________.

A clean B cleans C to clean D cleaning 3 I _________ to learn English 10 years ago. I ________ it for 10 years. A begin, have learned B began, have learned C began, learned D have begun, have learned 4 My sister has __________ to America twice.

A come B got C gone D been 5 Don‘t worry about Tom. He _________his homework.

A finishes B finished C has finished D had finished 6. Mrs. Wang has lived in Haikou _________ 1992.

A. since B. from C. after D. in

二 选词填空 （有两个词是多余的）

It was two weeks before , and Mrs. Smith was very . She a lot of Christmas cards to to her friends and to her husband‘s friends, and put them on the table in the living-room. Then, when her husband came home from , she said to him, ―Here are the Christmas cards for our friends, and here are some stamps, a pen and our book of addresses. Will you please the cards while I am cooking the dinner?‖

Mr. Smith did not say anything, but the living-room and went to his . Mrs. Smith was very angry with him, but did not say anything .

Then a minute later he came back with a box full of Christmas cards. All of them had addresses and stamps on them.

―These are from last year,‖ he said. ―I forgot to them.‖ 三 完型填空。

Mr. Green was ill and went to the hospital. A doctor __1__ and said, ―Well, Mr. Green, you are going to __2__ some injections, and you‘ll feel much better. A nurse will come __3__ give you the first one this evening, and then you‘ll __4__ get another one tomorrow evening.‖ __5__ a young nurse came to Mr. Green‘s bed and said to him, ―I am going to give you your __6__ injection now, Mr. Green. Where do you want it?‖

The old man was __7__. He looked at the nurse for a __8__, then he said, ―__9__ has ever let me choose that before. Are you really going to let me choose now?‖

―Yes, Mr. Green,‖ the nurse answered. She was in a hurry. ―Where do you want it?‖ ―Well, then,‖ the old man answered __10__ ―I want it in your left arm, please.‖ 1. A. looked for him B. looked him over C. looked after him D. looked him up 2. A. get B. give C. make D. hold

3. A. so B. but C. or D. and

4. A. must B. can C. had better D. have to

5. A. In the morning B. In the afternoon C. In the end D. In the evening 6. A. first B. one C. two D. second 7. A. confident B. surprised C. full D. hungry

8. A. hour B. minutes C. year D. moment 9. A. Somebody B. Anybody C. Nobody D. people

10. A. with a smile B. in time C. in surprise D. with tears in his eyes 四 阅读理解。

On a cloudy afternoon last September, Rubio watched Texas National Guard soldiers help passengers off planes at a small airport near College Station. All of them were running away from Hurricane Ike. They had something else in common as well. Each passenger wore a bright yellow Wristband, RFID, developed by Rubio‘s company. The Wristband had a computer chip, which allowed the state‘s emergency response center to follow the person. Who wore it.

―The wristband really made a difference,‖ says Rubio, adding that thousands of families who called the state‘s emergency response center during the hurricane were able to find loved ones. The wristbands also made a lot of money for Rubio‘s company.

That‘s a goal Rubio could not have imagined even a few years ago, as a 36-year-old stay-at –home mum with three kids under ten and a husband who traveled for work five days a week.

―All I wanted was to have my family back together,‖ she says.

Rubio considered doing something different after the birth of her third child and returned to work .A friend suggested the technology of RFID. It wasn‘t new but was mainly used to find packages.

send, post, Christmas, either, walked out of, stay in, busy, write, bought, study, tired, work Rubio began imagining wider use of RFID, and in 2005 the wristband appeared at a business conference and did a good job. in the wake of Hurricane Katrins, the company further used the technology, and later during Ike about 27,000 people were successfully saved.

―I‘m a mum with three kids or a woman in a technology field. I‘ve succeeded and got confidence.‖ Rubio also achieved something else. She finally has the family life she always wanted. 1 People wore wristbands during Hurricane Ike in order to____

A protect them from being hurt B be allowed to get on the planes

C lead their way to a safe place D be found easily by other people 2 Rubio decided to return to work because__________

A she wanted to make money B she liked the new technology C she needed a change in life D she was used to hard work 3 How did the wristband work according to the passage?

A Very well B All right C Not well D Very badly 4 what does Rubio think is the most important?

A Usual business B Family life C Great success D Social position

家庭作业

一、找出下列每组单词中画线部分读音与其余三个不同的单词。 ( ) 1. A. throw ( ) 2. A. think ( ) 3. A. year ( ) 4. A. holiday

B. brown B. thirteen B. hear B. lot B. country B. thieves B. few B. high

C. how C. their C. there C. come C. cloudy

D. down D. thank D. ear D. on ( ) 5. A. house 二、选出不同类的词。 ( ) 1. A. knives ( ) 2. A. carry ( ) 3. A. hard

D. blouse D. wives D. much

D. exam D. sharpener D. plane

C. books C. little

C. fast C. pen C. bar

( ) 4. A. book B. car ( ) 5. A. train B. bike 三、根据汉语写单词。

1. What heavy (箱子) they are!

2. His mother is a good cleaner. She cleans the streets more (仔细)than any other cleaner. 3. Jack likes English. I (也) like English. 4. This (机器) doesn‘t work. What‘s wrong with it? 5. Please tell me your telephone (号码). 四、单项选择。

( ) 1. The post office ______ at this time of day.

A. is close B. is closed

C. close

D. closing

( ) 2. ---Is Mr. King ______ new teacher? How‘s it going with ______? ---Yes, he‘s pretty good. He teaches _______ oral English.

A. you, he, us B. you, his, our C. your, him, our D. your, him, us ( ) 3. My brother a soldier in 1995. A. was B. has been ( ) 4. ---______ do you have ______ lunch?

C. would be

D. had be

---I usually have rice and vegetables. A. What, with B. Which, to

C. What, for D. Which, for

( ) 5. Miss Wang watched the volleyball match on TV last night, she? A. hasn‘t B. doesn‘t C. didn‘t D. wasn‘t ( ) 6. Can you come ______me, please? You can ______ me ______ the things.

A. on, helping, carry B. with, help, carry C. to, helps, to buy D. with, helping, take ( ) 7. ---Can you _______ me how to ______ this word in French?

---Sorry, I can‘t ______ French. A. tell, say, speak

B. talk with, say, speak

C. tell, speak, say

D. speak to, talk, say

( ) 8. Peter come with us tomorrow, but he isn‘t very sure yet. A. may B. must C. can D. will ( ) 9. There are many teachers on the playground. ______ are playing basketball.

______ are running. ______ are talking with some parents. A. Some, Others, The others B. Some, Some, The others C. Some, Some, Others D. Some, Many, Other ( ) 10. Not only my brothers but also I to attend the meeting.

A. are B. is C. am D. be

( ) 11. She tells ______ a friend of ______ will go to America next Monday. We will see______ off.

A. me, hers, him

B. me, her, him

C. us, her, them

D. her, his, his

( ) 12. The mother with her little son at my home that snowy night. A. are, at B. is, at C. is, on D. are, on ( ) 13. Help ______, children.

A. yourself B. yourselves

C. you

D. yourselfs

D. 40 minutes‘ walk

( ) 14. The hospital is a bit far from here. It‘s about______. A. forty minutes‘s walk B. 40 minute‘s walk C. forty minutes walk ( ) 15. There______ wrong with my bike.

A. are something B. are anything C. is anything D. is something ( ) 16. She went to bed the TV play was over. A. that B. so C. after ( ) 17. Work hard, you‘ll succeed.

A. or B. for C. because ( ) 18. I‘m hungry. Please give me ______ to eat.

D. so that D. and

A. something B. anything C. everything D. nothing ( ) 19. I‘m not good maths but I‘m doing quite well English. A. in, in B. at, at C. at, in ( ) 20. The film is not interesting. ______ people like it.

A. Little

B. A little

C. Few

D. on, in D. A few

( ) 21. The students to the park if it tomorrow. A. will go, not rain B. went, didn‘t rain C. will go, won‘t rain D. will go, doesn‘t rain ( ) 22. Yao Ming is a famous basketball player. I him. A. look after B. look for C. look up to ( ) 23. The clothes are so crazy that you shouldn‘t . A. put on them B. wear them C. put it on ( ) 24. Thank you for me the stamps. A. sending B. send C. to send

D. look at

D. wear it

D. sent

( ) 25. He was born a winter morning. A. on B. in C. at 五 完形填空

D. for

A

Once upon a time, some children were playing at seaside when they found a turtle(海龟). They began to beat the turtle. Just at that time, a young man came and said to them, ―Stop!‖ The children ran 1 quickly. The turtle was very thankful and said, ―Thanks for your kindness. I really would like 2 you to a wonderful palace now.‖ The young man rode on the back of the turtle and was taken to the secret palace in the sea. When he3 the palace, he was very surprised and said to the turtle, ―What a nice palace!‖ To thank him, the king of the turtles gave him 4 . He had never seen such a dinner before. He received a warm welcome there and was very 5 everything.

After dinner, the king of the turtles said, ―I am going to give you two boxes, 6 you can open only one.‖ ―You mustn‘t open both. Don‘t forget it!‖ the turtle warned him. ―All right. I will open only one,‖ the young man promised(许诺). At this time, a large wave sent him out of the sea.

After he 7 , he opened the bigger one of the two boxes. 8 the box was full of gold. ―My God!‖ he cried. ―I‘m 9 now.‖ Then he thought, ―Things in the other box must be expensive, too.‖ He could not wait any longer. He broke his promise and opened the other box. As soon as he opened it, he became an old man. His hair turned white. His face 10 an old man over eighty years old. It all happened in a moment. He was sorry for what he did, but it was too late. 1. A. through B. away C. into D. out

2. A. wanting B. asking C. to let D. to invite

3. A. left for B. arrived on C. arrived at D. got away

4. A. a very big dinner B. a very poor dinner C. a very bad dinner D. a very small dinner 5. A. pleased with B. strict in C. angry with D. sorry for

6. A. so B. or C. but D. as

7. A. went back to home B. was back home C. went back to the sea D. was back the sea 8. A. To his surprising B. To one‘s surprising C. To one‘s surprise D. To his surprise 9. A. a poor man B. a rich man C. an old man D. a young man 10. A. liked B. felt like C. looked like D. looked

B

For several years, Americans have enjoyed teleshopping-watching TV and buying things by phone. Now teleshopping is starting in Europe. In some European countries, people can turn on their TVs and shop for clothes, jewelry, food, toys and 1 things.

Teleshopping is becoming popular in Sweden. 2 , the biggest Swedish company sells different kinds of things on TV in fifteen European countries, and in one year, it makes $10 million. In France, there are two teleshopping channels, and the French 3 about $ 20 million a year in buying things through those channels.

In Germany, 4 last year teleshopping was only possible on one channel for one hour every day. Then the government allowed more teleshopping. Other channels can 5 for telebusiness, including the largest American teleshopping company and a 24-hour teleshopping company. German 6 are hoping these will help them sell more things.

Some people like teleshopping because it allows them to do their shopping without 7 . With all the traffic problems in cities, going shopping is not an easy thing. But at the same time, other Europeans 8 like this new way of buying things. They call 9 ―junk on the air.‖ Many Europeans usually worry about the quality of the things 10 on TV. They think high quality is the most important thing, and they don‘t believe they can be sure about the quality of the things on TV.

The need of high quality means that European teleshopping companies will have to be 11 the American companies. They will have to be more careful about 12 of the things they sell. They will also have to work harder to sell things that the buyers cannot touch or see by themselves. ( ) 1. A. some else B. another many C. the other D. many other ( ) 2. A. Such as ( ) 3. A. takes ( ) 4. A. to ( ) 5. A. begin ( ) 6. A. people ( ) 7. A. to go out

B. For example

B. cost B. until

B. leave B. women

C. For teleshopping D. It is like

C. spends D. spend C. unless D. by C. open

D. turn on D. officials D. buying things D. won‘t D. telephone D. to buy

C. businessmen C. to buy things

B. going out

( ) 8. A. still ( ) 9. A. teleshopping ( ) 10. A. appearing B. don‘t C. even B. TV C. radio B. coming out C. for sale

( ) 11. A. the same with B. different from C. as big as D. larger than ( ) 12. A. the number B. the quality C. the places D. the buyers 六 阅读理解

A

A Bridge Full of Danger

One afternoon, Kate and her brother Bob went out to play. Kate was eight, and Bob was ten. ―Let‘s go to the bridge and we can see fish in the river,‖ said Kate.

―I don‘t know…,‖ Bob said. ―Mum told us, ‗Don‘t go on the bridge.‘ She said it‘s dangerous.‖ Kate said, ―I am not afraid. Are you?‖

They walked onto the bridge and began looking for fish in the river. The bridge was a train bridge. Trains went over the bridge three times a day.

The children were standing in the middle of the bridge when they heard a loud noise. ―A train is coming!‖ Bob shouted. ―Run!‖ He ran to the end of the bridge. He was safe.

Kate ran, too, but she fell. The train was coming fast. Kate ran towards Bob. She fell again right on the train tracks. There was no time to leave. She had to lie down between the tracks. A few seconds later, the train went over the girl, but she was not hurt at all. She stood up and said to Bob. ―Don‘t tell Mum! Don‘t tell Mum!‖ At last their mother found out about the story. She was angry because they went on the bridge. But she was happy that Kate was all right.

1. Bob and Kate were . A. twins B. brothers C. sisters D. brother and sister 2. One afternoon they went to the bridge to see . A. their mother B. fish C. the train

D. the river

3. When the train came, the children were . A. in the middle of the bridge B. at the end of the bridge C. on their way to the bridge

D. away from the bridge

4. Where was Kate when the train was going over her?

5. When their mother knew about the story, she was . A. happy B. angry C. sorry

D. both angry and happy

B

任务型阅读理解。

Dolphins

Can dolphins talk? Maybe they can‘t talk with words, but they talk with sounds. They show their feelings with sounds.

Dolphins travel in group. We call a group of fish a ―school‖. They don‘t study, but they travel together. Dolphins are mammals(哺乳类动物), not fish, but they swim together in a school.

Dolphins talk to the other dolphins in the school. They give information. They tell when they are happy or sad or afraid. They say ―Welcome‖ when a dolphin comes back to the school. They talk when they play. They make a few sounds above water. They make many more sounds under water. People cannot hear these sounds because they are very, very high. Scientists make tapes of the sounds and study them.

Sometimes people catch a dolphin for a large aquarium(水族馆). People can watch the dolphins in a show. Dolphins don‘t like to be away from their school in an aquarium. They are sad and lonely. There are many stories about dolphins. They help people. Sometimes they save somebody‘s life. Dolphin meat is good, but people don‘t like to kill them. They say that dolphins bring good luck. Many people believe this. 根据短文内容回答下列问题。 1. When do dolphins talk to others? 2. When do they say ―Welcome‖? 3. Do they make more sounds above or under water? 4. Can people hear dolphin sounds? Why? 5. How does a dolphin feel in an aquarium?