山东省济南市历下区2020届九年级下学期中考一模试卷(英语)

山东省济南市历下区人教版PEP英语2020届九年级下学期

中考一模试卷

英语

（满分120分）

第Ⅰ卷（选择题共85分）

I.听力测试(20分)

A）听录音，在每组句子中选出一个你听到的句子。每个句子听一遍。（5分）

（）1. A.It’s a nice day, isn’t it?

B.The traffic is very busy at this time.

C. Most of our teachers come to school by bus.

（）2. A.Is the hotel between the park and the station?

B.Did you visit your best friend on vacation?

C.Can they organize the games for the class party?

（）3. A. She went hiking in the hills .

B. I had a wonderful time on Sunday night.

C.We should exercise more to keep healthy.

（）4. A.What do you think of the school?

B.When were you supposed to arrive?

C.What kind of food would you like?

（）5. A. Don’t listen to music in the library .

B. If he wears jackets, we won’t let him in.

C.You can speak Putonghua a lot.

B）听录音，从每题三幅图画中选出与听到的对话内容相符的一幅。每段对话听两遍。（5分）

( )6. A . B. C.

( )7. A . B. C.

( )8.A. B. C. .

( ) 9. A. B. C.

( )10. A. B. C.

C）在录音中，你将听到一段对话及五个问题。请根据对话内容及问题选择正确答案。对话及问题听两遍。（5分）

（）11. A. Jack. B.Alice. C. Victor.

（）12.A. Once. B.Twice. C. Three times.

（）13.A.Yes, he is. B. No, he isn’t. C. She doesn’t think so. （）14.A. Since six years old. B. Since seven years old. C. Since nine years old. （）15.A. A T-shirt. B.A bike. C. A pair of skates.

D）在录音中，你将听到一篇短文及五个问题。请根据短文内容及问题选择正确答案。短文及问题听两遍。(5分）

( ) 16.A.No, they aren’t. B.No, they don’t. C. Yes, they do.

( )17.A.Swimming. B.Reading . C.Traveling .

( )18.A.Because of good friends. B. Because of learning a lot. C. Because of his job. ( )19.A. Playing soccer. B.Climbing hills. C.Both A and B.

( )20.A.At six. B.At sixteen. C.At four.

II.读音选词根据所给句子和音标，从四个选项中，选出一个最佳答案（5分）。（）21.This hat is too ________ / b I g/. Do you have a small one?

A. big

B. bag

C. boy

D. pig

（）22. Most students walk or ________ / r a I d / bikes to school.

A. read

B. ride

C. rain

D. rich

（）23. Don’t forget to brush your _________／ti: θ／before you go to bed.

A．teeth B．month C．tooth D．teach

（）24. I don’t know _______ / we? / Mr. White comes from?

A. wet

B. where

C. wear

D. while

（）25. Marry wants to be a famous actress in the _______ / 'fju:t?? /.

A.favorite

B. free

C. foreign

D. future

III. 选择填空从每题四个选项中，选出一个最佳答案（30分）。

（）26. -- Excuse me, do you have _______ English dictionary? -- Yes, I do.

A. a

B. an

C. the

D. /

（）27. -- Is that _________ sister, Dave?

-- No, it isn’t. She is my friend.

A. you

B. your

C. she

D. herself

（）28. -- What’s your favorite sport ?

-- _________. It’s interesting.

A. Math

B. T-shirt

C. E-mail

D. Basketball

（）29. The food in KFC is bad _______ you. Don’t eat too much.

A. in

B. at

C. for

D. with

（）30. --________ do you like pandas?

-- Because they are kind of cute.

A. How

B. Why

C. When D . What

（）31. It rained very heavily, ________we had to stay at home to watch TV.

A. so B . but C. though D. or

（）32. --Is Sam taller than John？

--No. Sam is not _________ him.

A. tall than

B. the same tall as

C. taller than

D. so tall as

（）33. Father’s Day is on_________ Sunday of June.

A. three

B. the three

C. third

D. the third

（）34. Which is not allowed if you have drunk too much wine ?

A. B. C. D.

（）35. -- Our school basketball team won the game last night.

-- ________ good news!

A. What

B. How a

C. What a

D. How

（）36. Tom often goes to the beach on vacation, _________？

A. does n’t he

B. does he

C. do they

D. don’t they

（）37. -- Lucy, when did you plant trees, last Saturday or Sunday ?

--_________. We did it last Friday.

A. Both

B. Neither

C. Either

D. All

（）38.-- Jim, I’m going to the Great Wall next week.

-- ___________.

A. Have a good time.

B. Don’t worry

C. Good luck

D. Study hard.

（）39. -- What do you think of the song “My Heart Will Go On ”?

-- It __________wonderful. I like it.

A. looks

B. feels

C. smells

D. sounds

（）40. More and more people found _________ necessary to have a balanced diet.

A. it

B. that

C. this

D.it’s

（）41. --Whose tennis racket is this, Linda?

--Look! Jerry's name is on it! It _________ be his.

A. may

B. must

C. can't

D. mustn't

（）42. Zhou Libo’s talk show is very funny. It often makes people_________.

A. laugh

B. laughing

C. to laugh

D. laughed

（）43. -- Where would your parents like to live after they retire?

-- They’d like to live_________.

A. somewhere relaxed

B. relaxing anywhere

C. relaxing somewhere

D. somewhere relaxing

（）44. There ________a concert of Zhang Xueyou in Jinan on April 29th .

A is going to have

B will have

C is going to be

D are going to be （）45. --_________do you have P

E lessons?

--Three times a week.

A. How long

B. How soon

C. How many

D. How often （）46. It’s so hot. Look! The kids _________ at the pool.

A. swims

B. swam

C. are swimming

D. was swimming （）47. --Teenagers should speak to the old people _________ ?

-- I agree with you.

A. probably

B. terribly

C. politely

D. badly

（）48. --Tom used to be afraid of snakes.

-- ________. I thought they were scary.

A. So did I

B. So do I

C. So was I

D. So I was

（）49. I prefer ________ at home rather than _________ out for a picnic on a rainy day.

A. stay, to go

B. to stay, to go

C. stay, go

D. to stay, go （）50. -- It’s too cold outside. Would you mind closing the window ?

-- __________.

A. Yes, please.

B. Of course not.

C. You’re welcome.

D. All right. （）51. --Don’t _________ too late, or you will feel sleepy in class.

--I won’t, Mum. Good night!

A. put up

B. cut up

C. end up

D. stay up

（）52. -- May I use your mobile phone, Meimei?

--Sorry, I _________ it at home.

A. took

B. left

C. forgot

D. brought

（）53. -- How long has your son __________ the ipad2?

-- Only about two weeks.

A. bought

B. had

C. borrowed

D. received

（）54. Mr. Wang is so friendly to his students that he is__________ their friend.

A dressed up

B regarded as

C looked like

D looked at

（）55. -- Could you please tell me __________?

-- By learning to forget.

A. what are you doing now

B. how I can deal with the problem

C. when they arrived at the station

D. why was he late for school

IV.完型填空阅读短文，从每题四个选项中，选出一个最佳答案。（10分）One evening my father and I went to see a circus(马戏). A family was standing in front of us ,__56__ for tickets.

The family had eight children. Their clothes were not __57__, but they were clean. They were talking about the clowns and elephants excitedly.

“I want __58__ tickets, eight for children and two for adults,” said the father to the ticket lady.

The ticket lady told him the __59__. When he heard that, the man couldn’t believe his __60__. He asked again, “How much?”

The ticket lady spoke again. The father looked sad. Clearly, he didn’t have __61__ money.

My dad took a $20 bill and __62__ it on the ground. Then he said to the man, “Sir, this bill fell out of your pocket.”

The man knew __63__ was going on. He looked into my dad’s eyes and took the __64__. “Thank you, thank you, sir. This __65__ means a lot to me and my family.”

We didn’t go to the circus that night, but we didn’t feel sorry for it at all.

（）56. A. waiting B. looking C. working D. leaving

（）57. A. dirty B. cheap C. expensive D. ugly

（）58. A. two B. five C. eight D. ten

（）59. A. ticket B. number C. price D. time

（）60. A. eyes B. ears C. nose D. head

（）61. A. enough B. any C. little D. few

（）62. A.brought B.got C. dropped D. gave

（）63. A. what B. how C. who D. where

（）64. A. book B. bag C. ticket D. bill

（）65. A. hardly B. really C. only D. nearly

Ⅴ. 补全对话阅读对话，从四个选项中, 选出一个最佳答案完成对话。（5分）A: Hi, Wang Ling! Do you remember me ?

B: Oh, you are Lin Tao, aren’t you?

A: That’s right.

B: You have changed a lot. 66 .

A: Yeah, and I was a little shy.

B: By the way, where are you going?

A: I am going to the concert. 67

B: Sure, I do. But I remember you didn’t use to like music.

A: You are right. But now I am interested in listening to music. And I like singing very much.

B: Great! 68

A: I like music that I can sing along with .

B: 69

A: Yes. I have learnrd since last term. Oh, it’s time for me to go now.

B: Ok! 70

（）66. A. You used to be short. B. You used to be outgoing.

C. You used to be quiet.

D. You are outgoing.

（）67. A. Are you free? B. Are you busy?

C. Do you like to go to a concert?

D. Where are you going?

（）68. A. Do you like gentle music? B. What kind of music do you like?

C. Do you like pop music?

D. Who is you favorite star?

（）69. A. When did you start singing? B. How long have you been singing?

C. Why do you like music?

D. Have you learned to sing?

（）70. A. Here you are. B. Fine, thanks.

C. See you!

D. You’re welcome.

VI. 阅读理解阅读短文从每题四个选项中，选出一个最佳答案。（15分）

A

Balzac(巴尔扎克) was a great French writer. But he was very poor before he became famous. He lived in a dirty, wet room and was often worried about food. All his friends were very poor and they could not help him.

One night it was very cold. The wind blew and it was snowing heavily. Balzac went to bed early but couldn’t fall asleep. He didn’t get any food before he went to bed. He thought and thought, but he could n’t have a good idea. At midnight he saw a man climb in through the broken window. The man began to steal something on his bookshelf. Balzac got up quietly and said, “Don’t waste time, my friend! I couldn’t find any money in the daytime. How can you find some in the dark?”

（）71. Balzac was a ________.

A. worker

B. writer

C. doctor

D. cleaner

（）72. Balzac lived in a dirty, wet room because ________.

A. he was very poor

B. he wanted to live there

C. it was cold

D. he was a famous man

（）73. Why didn’t he ask his friends for some food? Because __________.

A. he had no friends

B. his friends didn’t want to help him

C. all his friends were very poor

D. his friends didn’t like him

（）74. How was the weather that night? It was ___________

A. rainy

B. cloudy

C. sunny

D. snowy

（）75. Could the thief find any money? __________

A. Yes, he could.

B. No, he couldn’t.

C. Maybe.

D. I don’t know.

B

Last week, 169 students at No.35 Middle School of Shenyang took their first no-teacher exam. After the teacher handed out the exam paper, he left the room and never came back. A student collected in the papers when the exam ended.

“That test was not only a test of knowledge, but also a test of moral (道德). We wanted to show students how important honesty is, ” said Mr. Cai, the school’s headmaster. The school says no cheating happened in the test. Next year, it wants 80% of its exams to be without teachers. But students have different ideas.

“I was happy and excited during the exam because my teachers trusted me,” said Lang Yudan, a 13-year-old girl in Class 11.

“Schools must trust students a lot not to use invigilators(监考人). But I think it is too early. Some students will cheat if there are no invigilators. And the students will not be able to ask for help when needed,” said Hua Sha.

“I don’t like having invigilators in exams. When they walk around the classroom, they make me nervous. I would get higher marks without them in the room because I would feel more relaxed,” Liu Qingxi said.

“I think it’s very important to have invigilators in exams. Many students want to check their answers with each other after they have finished papers. And they can also keep the classroom in order when something unusual happens. They may make me nervous, but I still think we need them,” Shangguan Yan said.

Not using invigilators may be a good idea. But before using it, schools must tell students the importance of honesty and try to find ways to solve something unusual in exams.

( )76.The passage mainly talks about ________.

A.how to pass an exam

B.how to make students honest

C.whether invigilators are needed in exams

D.how to make students clever

( )77. No.35 Middle School of Shenyang held a no-teacher exam to _________.

A.let the students have a good rest

B.teach the students in a better way

C.help all the students pass the exam

D.find whether the students were honest

( )78.From what the students have studied, we know _________.

A.invigilators really help them a lot

B.not all of them agree with the headmaster

C.something unusual never happens in exams

D.they like it very much

( )79.What does Hua Sha think about no-teacher exams ?

A.It’s a good idea to have no-teacher exams but something must be done first.

B.If there are no invigilators, the students will certainly get lower marks.

C.Exams without invigilators will never be held since students are not honest.

D.Some parents don’t think it’s fair for everyone to have no-teacher exams.

( )80. In the sentence “And they can also keep the classroom in order when something unusual happens” , “they” refers to __________.

A.students

B.headmasters

C.teachers

D.invigilators

C

One day after school Mr. Tillman found Philo Farnsworth making drawings on the blackboard in the school-room.

“W hat are you doing?” Mr. Tillman asked with interest. “ What are these drawings?”

“I want to invent things,” Philo answered, “and t hese are

drawings of my first inventions.”

Mr. Tillman smiled to himself, “What is your invention?”

“I have an idea for a way of sending pictures through the air,” The boy answered. “Please just let me tell you about it. You are the only person who can und erstand what I have done.”

In 1922, even radio was new. The United States had fewer than

30 radio stations. But in 1922, a boy of 16 showed his teacher drawings for television!

In 1926, Philo worked as an office boy in Salt Lake City. Many important businessmen came into the office where he worked. One of these, George Everson , was from San Francisco. Like Mr. Tillman, Everson soon became interested in Philo. The shy, hard-working boy was like other office boys who Everson had known.

One evening Everson asked Philo to have dinner with him. After the meal, Philo began talking about his idea for Television. At first, Everson was not much interested in the invention. He listened only to be polite.

Many years later, Everson wrote a book telling about that eveni ng with Philo. “As Farnsworth talked, he seemed to change,” Everson wrote, “His eyes lighted up , and he was no longer shy.” Talking freely about his invention, Philo Farnsworth was no longer an office boy--he was a scientist.

At the end of the evening, Everson was more interested than ever in Philo. And he was also interested in Philo’s idea for television.

After talking with Philo , Everson returned to San Francisco. There he brought together a number of important businessmen . Philo told them about his invention. The men became so interested in the young inventor that they gave $25,000 to help him work on his idea. Philo was only 20 years old, but here was his chance.

( )81. What kind of drawings was Philo making on the blackboard one day?

A. Drawings of his school-room.

B. Drawings of his invention.

C. Drawings of his interest.

D. Drawings for Mr. Tillman.

( )82. Philo’s new idea was to _______________.

A.tell his teacher all about his invention

B.show Mr. Tillman about his idea by drawings

C.send pictures through air

D.make other people see things by pictures

( )83. George Everson first became interested in Philo because he ________________.

A. did his work well as an office boy

B. was quite different from other office boys

C. was shy and did not work hard

D. was also interested in Philo’s drawings

( )84. When talking about his invention, Philo ____________.

A. listened to Mr. Everson politely

B. became more interested in the businessman

C. seemed to change his idea

D. looked like a scientist

( )85. Which of the following is true?

A.Philo made his television only four years later.

B.Mr. Everson helped Philo to invent the television with his own money.

C.Mr. Everson himself was an important businessman.

D.The businessmen in Salt Lake City gave Philo the money for his invention.

第Ⅱ卷（非选择题共35分）

VII. 选词填空（10分）

A.阅读短文，从方框中选择适当的单词填空（每词限用一次）。

homework happier with chatting feed

My grandpa is over 70 years old. I like ____86____ with him. He used to live in a mountain village when he was young. Every morning he had to get up early and ____87_____the animals. There was no TV set then, and there was no delicious food to eat.He always says we are____88____than th ey were. But I don’t think so. Because we have too much _____89____ and too many exams every day. Do you agree ___90____me ?

86._____________ 87.__________88. _____________ 89.___________90. _____________

B.阅读短文，从方框中选择适当的动词，并用其适当形式填空。有的需要加助动词或不定式符合（每词限用一次）。

enjoy become study learn win

Li Yundi was born in Chongqing, 1982. At the age of 4, he began____91____the accordion. Two years later, he____92____ with Dan Zhao Yi, one of China's most famous piano teachers . In October 2000, Li took part in the 14th Chopin International Piano Competition in Poland. Li was the competition's first Chinese winner. Li ____93____top awards at different competitions so far. Li showed up at the 人教版PEP英语2020 Spring Festival Gala. His performance ____94____by millions of people in China. We all hope that Li ____95____ more successful.

91._______________92._______________93.____________94.____________95._________ VIII. 改写句子按括号中的要求完成句子，每个空格填一个单词。（5分）

96. We will have a class meeting this afternoon. (改为否定句)

We ___________ ___________ have a class meeting this afternoon.

97. He has learned to play the guitar for five years. (对划线部分提问)

___________ ___________ has he learned to play the guitar ?

98. My pen pal asked me, “ Do you wear school uniforms to school every day?”

(改写句子，句意不变)

My pen pal asked me __________ I ____________ school uniforms to school every day. 99. It’s best to make a telephone call in a lower voice in public places. (改写句子，句意不变)

You’d better ___________ _____________ your voice when you talk on the phone in public places.

100. Divide the students into groups so that they can discuss the questions more easily.

(改写句子，句意不变)

If the students are ___________ into groups, it’ll be ___________ for them to discuss the questions.

IX. 完成句子根据汉语意思完成英语句子，每个空格填一个单词。（共5分）101.他们每天放学后都按时回家，。

They__________ __________ on time after school every day.

102.每个人看到地上有垃圾，都有义务把它捡起来。

It’s everyone’s duty to ___________ ___________ the litter on the ground.

103.童年时代，书籍使他的生活充满了乐趣。

Books __________ his life __________ pleasure when he __________ young.

104.科学研究不能凭空想象，需要不断实践。

_____________research can’t____________ ___________ , it needs more practising.

X. 任务型阅读阅读短文，按要求完成各题。（5分）

Health experts predict that soon, more people will die from cancer than from AIDS, tuberculosis (结核病)and malaria combined（疟疾）. They expect that by 人教版PEP英语2020, cancer will become the world's leading cause of death.

Experts say one reason that more people are dying from cancer is because they are smoking cigarettes in developing countries. 40 percent of the world's smokers are believed to live in China and India alone. Other things including high fat diets and fewer physical activities are also believed to be pushing the numbers more.

Rates (比率) of breast cancer (乳腺癌) in Japan, Singapore and South Korea are now 3 times what they were 40 years ago.

The W.H.O. report says that 12 million people will be found to have some kinds of cancer this year. It predicts that more than 7 million people will die early as a result of cancer. And more than 5 million of the new cancer cases will be in developing countries.

The number of cancer cases and deaths from cancer are expected to increase one percent each year. Experts are predicting the largest increases will be in China, Russia, and India.

Without new treatments, the W.H.O. says, the number of new cancer patients could reach 27 million a year by 2030. The number of deaths could reach 17 million a year.

A report in December said the number of men and women dying of cancer in the United States had dropped for the first time .The report in the Journal of the National Cancer Institute said the drop was mainly the result of fewer cases of lung（肺）, prostate（前列腺）and colorectal(结肠) cancer in men. In women, it resulted from fewer cases of breast and colorectal cancer.

The American Cancer Society says governments can do things to help stop the increase in cancer cases and deaths. One idea is to provide poor and developing nations with vaccines(疫苗) that help to stop some cancer-causing infections (感染). One example of a cancer-causing infection is human papillomavirus (乳头瘤病毒). This virus(病毒) can cause cervical cancer in women.

Another suggestion is more support for cigarette-control programs. And the cancer society says health officials and governments should pay more in cancer research and early detection(检测).

105.根据短文内容完成句子填空(每空限填一个单词)。

From the first paragraph of the passage, we know __________ will be the ________ killer soon.

106.根据短文内容完成句子填空(每空限填一个单词)。

According to the passage, in developing countries more people are dying from cancer because of ___________ ____________

107.根据短文内容回答问题。

According to the passage, in which countries will cancer increase fastest ?

____________________________________________________________________.

108.把短文中划线句子译成汉语。

_____________________________________________________________________ 109.根据短文内容用一个完整的英文句子回答问题。（10个词左右）

What can governments do to stop the increase of cancer ? （one thing is OK）

_____________________________________________________________________

XI．书面表达（10分）。

根据所给图画，用英语写一篇约80字的短文。要求完整叙述图画内容。

一模测试听力原文

A) 听录音，在每组句子中选出一个你所听到的句子，每个句子听一遍。( 5分)

1.It’s a nice day, isn’t it?

2.Did you visit your best friend on vacation?

3.I had a wonderful time on Sunday night

4. What kind of food would you like?

5. Don’t listen to music in the library .

B)听录音，从每题三幅图中选出与听到的对话内容相符的一幅。每段对话听两遍。（5分）

6. A: My mother is a doctor.

B: Does she often work at night?

A: Sometimes.

7. A: What will the weather be like tomorrow?

B: It will be rainy.

8. A: How did you go to school?

B: I took the train to school.

9. A: My brother plays his CDs too loud.

B: Oh, you can tell him to turn it down.

10. A: Why do you want to get the part-time job?

B: Because I need some money to buy flowers for my mother`s birthday.

C) 在录音中，你将听到一段对话及五个问题。请选择正确答案。对话及问题听两遍。（5分）A:Victor,congratulations on winning the skating marathon.!

B: Thank you!

A:So,how long did you skate?

B:Six hours.

A:Was this your first skating marathon?

B: No, I skated in a marathon last year .

A:You are an excellent skater, Victor. Do you skate every day?

B: Yes, I do.

A: How long have you been skating.?

B:Since I was seven years old . I got my first pair of skates on my seventh birthday from my grandmother.

Qs: 11.Who has won the skating marathon?

12.How many times was he in the skating marathon ?

13. Is he an excellent skater?

14.How long has he been skating ?

15.What ’s his birthday present ?

D)在录音中，你将听到一篇短文及五个问题。请选择正确答案。短文及问题听两遍。（5分）

Different people have different hobbies. For example, someone likes reading, somenone likes swimming and someone likes collecting and so on.

I used to read books a lot .Because by reading books I could learn many funny things. But now I don’t like it. I can only learn from books. I couldn’t get knowledge from others. I need to

change myself. Traveling is my hobby now. I can visit many different places of interest . I can learn a lot about people, places and history. I love traveling. I have great fun in traveling. It’s very interesting.

I have many good friends. They all have their hobbies like me. Tony loves sports, and his hobby is playing soccer and climbing hills. Ann is a quiet girl. She can play the piano well. She began to study it at the age of six . We have different hobbies, but we are good friends.

What is your hobby ? Do you like singing ,drawing or some other things ? Good hobbies can bring us great pleasure and make us have many more friends.

Qs:16. Do many people have hobbies ?

17.What did he use to do?

18. Why does he like traveling now?

19.What’s Tony’s hobby?

20.When did Ann begin to play the piano?

参考答案：

I.1-5 ABBCA 6-10BAACC 11-15 CBABC 16-20 CBBCA

II.21-25ABABD

III.26-30BBDCB 31-35 ADDCA 36-40ABADA 41-45BADCD

46-50CCADB 51-55DBBBB

IV.56-65ACDCBACADB

V.66-70CCBDC

VI.71-75BACDB 76-80 CBBAD 81-85 BCADC

VII.86-90 chatting feed happier homework with

91-95 to learn, studied , has won, was enjoyed, will become

VIII.96. will not 97. How long 98. if….wore 99. keep down 100. divided easier IX.101. go home 102. pick up 103. filled …with….was 104. Scientific…..be imagined X.105. cancer first/main/leading

106. smoking cigarettes

107. In China, Russia, and India.

108. 十二月份的一份报告说，在美国男女死于癌症的人数首次减少/ 数量下降。

109. 此题应严格控制字数。超过12个词的不能得全分。

a. They can provide poor and developing nations with vaccines.

b. They can support cigarette-control programs.

c. They can pay more in cancer research and early detection.

XI.书面表达评分标准

1）卷面书写潦草不工整，可酌情从总分中扣1分。

2）拼写错误每两个扣0.5分，同样错误不重复计算。

3）书面表达可分为4个等级：

（1）9-10分短文内容符合每幅图画情景，语句通顺，情节连贯，书写工整，无语法错误，字数符合要求。

（2）7-8分短文内容基本符合每幅图画情景，语句通顺，情节较连贯，书写工整，语法错误较少（1-2处），字数基本符合要求。

（3）5-6分短文内容符合每幅图画情景，语句尚通顺，情节较连贯，书写较工整，3-4处语法错误，字数在60词左右。

（4）5分以下。短文内容不能紧扣图画情景，语句不够通顺，语法错误较多，书写一般，字数在50词以下。