Unit1-Unit 2单元练习卷2024-2025学年沪教版（五四学制）（2024）六年级英语下册

六年级第二学期课堂练习 Listen to the passage and tell whether the following statements are true or false 5% ( )1. They are going to have a sports meeting. ( )2. It will rain at night. ( )3. The speaker asks the students to close the windows when they leave. ( )4. The students needn’t bring homework to school tomorrow morning. ( )5. The speaker asks the students not to watch TV till too late. Listen to the passage and complete the sentences. (听短文，完成下列内容，每空格限填一词)10% 1. The new library in our school is a ___________ __________. 2. There are four _______ _________ in the library. 3. Students can ________ books ________ the library every Friday afternoon. 4. They can keep the books for __________ __________. 5. Students can find exciting things and __________ __________ in the books. Spell the word according to the given phonetic sound.（看音标写单词）5% 1. Bob was angry because someone took his food __________ asking. [wɪˈðaʊt] 2. Where else can you find these ______________. [saɪnz] 3. My best friend has many _____________ , such as dancing and singing. /ˈhɒbiz/ 4.The girl in red skirt is ______________ than her friend. /ˈslɪmə(r)/ 5. Everyone was busy reading books, so nobody _______________ /'nəutist/him. Choose the best answer. (选择最恰当的答案，用A, B, C或D表示，填入括号内)（20分） ( )1. My sister is ________ easy-going girl, and she can play ________ violin well. A. a; the B. the; an C. an; the D. the; a ( )2. Angela is flying to New Zeeland soon. She will arrive __ Auckland ___ the morning of March 18. A. at…in B. in…on C. in…in D. at…on ( )3.It's hard to make a decision because __________ has his or her own strong points. A. someone B. anyone C. everyone D.no one ( )4. There are about ________ students in our grade. A. hundred of B. three hundred C. three hundreds D. hundreds of ( )5.According to the map, you can find the bus station on _________ side of the street. A. other B. another C. the other D. others ( )6. He made ________ mistakes in the test, so he got a high mark. A. little B. a little C. few D. a few ( )7. There are many ways to keep them ______. A. save B. safe C. safety D. safely ( )8. Please listen to the teacher as _________ as possible so that you can understand the text better. A, careful B, much carefully C, more carefully D, carefully ( )9.________ important the rules are to our life! A.What B.How C.What a D.What an ( )10. Mike, ___________the flowers in the park. A. don't pick up B. doesn't pick C. don't pick D. don't pick on ( )11. Mind your steps as you go, _____ you’ll fall down onto the wet ground. A. and B. but C. or D. so ( )12.The students stopped __________ and started ___________ when the teacher came. A.talking; reading B.talking; read C.to talk; reading D.to talk; to read ( )13.In the future, people will__________live and work in space stations. A.can B.able to C. be able to D.could ( )14.That funny story made us all ________. A. laugh B. to laugh C. laughing D. laughed ( )15.There a talent show in the school hall tonight. A. is going to be B. is going to have C. will have D. are going to be ( ) 16.The police told us __________football in the street because it was dangerous. A. don't play B. doesn't play C. to not play D. not to play ( )17. There is still some milk at home. We ________ buy any at the supermarket now. A. don’t need B. needn’t C. needn’t to D. need to ( )18.I suggest __________ abroad during this coming summer holiday. A. to travel B. travel C. travelling D. travels ( )19. If it rains heavily, we ______ some indoor activities instead of playing football. A. do B. will do C. did D. have done ( ) 20. ---Would you mind my using your printer for a while? ---_________________. A. Never mind B. Certainly not C. You’re welcome. D. Sorry, I can’t. Complete the following passage with the words in the box.Each can be used only once 6% A. its B. countries C. much D. save E. yourself F. friendly Every day, a lot of food goes uneaten(没吃) and ends up in the trash, while many people in poor _____1____ have nothing to eat. The next time you sit down to have a delicious dinner, ask ____2_____ ” How much food can I eat?”, it will help you cut down on waste. The most important thing to remember is to be ____3____ to the environment(环境). Just take as ____4____ as you can eat, don’t buy things you neither want nor need, and leave litter in _____5_____ right place. If everyone could cut down on waste in daily lives, the world would be great. We know that many restaurants have joined the “clear your plate” campain(光盘行动) to 6 food. We students should do the same in our daily life, especially(尤其是) when having dinner with our friends and relatives. Complete the sentences with the given words in their proper forms 8% 1. Our classroom rules are similar to __________(they) 2. We usually plant trees on the ________of March, the Tree Planting Day. (twelve) 3. Attention, please. I have an important ________________ (announce) to make. 4. At the ________________ of the meeting, all the people stand up to sing a song. (begin) 5. The old man looked __________ when he heard the bad news. (happy) 6. It’s impolite to talk ____________ in public. (loud) 7. Thank you for ____________ (offer) me so much help. 8. Paul and Lu Yao are _______________ in Science club. (interest) Rewrite the following sentences as required.（根据所给要求，改写下列句子, 每空格限填一词) (14分) 1. She needs someone to make a poster about rules. (改为否定句) She ________ ________ anyone to make a poster about rules. 2. Don’t wear open-toed shoes in the lab. (保持句意不变) You ______ ______ open-toed shoes in the lab. 3. He will come back in a week. (划线提问) ________ ________ will he come back? 4. Shall we ask other students about our programme? (保持句意不变) _________ ________ asking other students about our programme? 5. Linda won the first prize with the help of her teacher. (对画线部分提问) _________ _________ Linda win the first prize? 6. Please give your seat to anyone in need, ________ ________?(改为反意疑问句) 7. you, and, go to the lab, do some experiments, ready to, are (连词成句) ________________________________________________________________________? Translation （把下列中文翻译成英文）（10分） 1. 不同的人对这个故事有不同的观点。(opinion, on ) 2. 她正在和我们分享一个规则故事。 (share) 3. 当她唱歌的时候，每个人都嘲笑她。 (laugh at) 4. 每个人都能从这个寓言中学到一些特别的东西。(learn from) 5. 请在黄线处稍等，注意空隙。(wait, mind) Reading comprehension and writing. (阅读理解) (32分) A. Choose the right sentences to complete the dialogue. （5分） ( A．Do you know when the party will start? B．What do you want to talk about? C．Eve rything about the future is OK. D．Can you come over and help me? E．And I’m sure if you go to the party, you’ll have a great time. F．Wow, that’s a great idea. ) Daughter: Mummy, I am going to a group chat party with my classmates. Mother: Oh, great, honey! I’m glad you can make it to a group activity. Daughter: 1 Mother: Sure, I’d love to. What’s it all about? Daughter: Let me see, environment, future cars, science… 2 Mother: Cool topic. 3 Daughter: I have no idea, but I don’t really want to discuss cars and pollution. Mother: Maybe you can try to talk about what the future schools will be like. Daughter: 4 Thank you, Mom. Mother: No worries, darling! 5 B. Choose the best answer. (根据短文内容, 选择最恰当的答案, 用A, B, C或D表示, 填入括号内) 6% On June 1st this year, the Green Shopping Centre will hold some fun activities to celebrate Children’s Day. Let’s Have Fun Art show. 9:00-12:00 Art Hall, 1st floor Lunch 12:00-13:00 Flower Restaurant, 2nd floor Music show 13:00-14:30 Concert Hall, 1st floor Sports meeting (family activities) 14:30-17:00 GSC Sport Area, 6th floor Age: 6-12 years old. Every child should come with at least one adult. Ticket: Free Prize for the sport meeting: 1st prize (two children): a big toy and a book 2nd prize (five children): a small toy and a book 3rd prize (eight children): a book If you want to join us, please sign up for the activities at our WeChat official account (微信公众号) from May 18th to May 24th. The number of people for each activity is 50, and every family can choose two activities at most. Here you can have a good time with your family and may make some new friends. Looking forward to seeing you on Children’s Day! ( )1．How long does the lunch break last? A．two hours B．one hour C．one and a half hours D．half an hour ( )2．What can we learn about the music show? A．It is on the 6th floor. B．It has two 1st prizes. C．It is in the afternoon. D．It is a family activity. ( )3．Who can join in the sports meeting? A．12-year-old Ben and his younger brother. B．Andy and her 5-year-old son. C．15-year-old Amy and her sister. D．John and his 9-year-old daughter. ( )4．Mike didn’t successfully sign up for the sports meeting with his 8-year-old son probably because________. A．He only chose one activity B．he forgot to pay for the ticket C．he signed up for it on May 21st. D．he was the 51st one to sign up for it. ( )5.Kim is the fifth girl to win 2nd prize, what can she get ? A. a big toy and a book B. a small toy and two books C. a small toy and a book D. a book ( )6．Where can we probably read this passage? A．In a fable. B．In a newspaper. C．In a dictionary. D．In a storybook. C. Read the passage and choose the proper word or phrases to complete the passage.6% A dog was heading home after he spent a day ___1___ a big, delicious bone. It was getting dark(黑暗的）and on the way he passed by a river. He saw his reflection(倒影）in the river. He was very____2_____.He thought he saw____3_____dog with a bigger, better bone than the one he had. He had a bone, but he wanted that bone too. _____4______ thinking twice, he shouted at the "other" dog and tried to get his bone. When he shouted, his bone fell out of his mouth and dropped into the river. Then he realized what had happened. He felt very regretful(后悔的）. He had to go home with no bone at all. We always want more than we have, _____5_____ when we take a look at what we have, we might realize that the bone we have is enough. It doesn't mean that we shouldn't go for bigger and better things, though. We should just be careful about always wanting more. We should _____6_____if the bigger one we want is the real big one. Our wish to have our cake and eat it will probably make us have nothing at all. ( )1.A.find B.to find C.finding D.found ( )2.A.surprising B.surprised C.sad D.happy ( )3.A the other B.other C.another D.others ( )4.A.With B.Without C.After D.Before ( )5.A.but B.and C.so D.because ( )6.A.find B.put out C.find out D.put up D. Answer the following questions.（回答问题） 5% The world is filled with many interesting sounds. Some are very pleasant to hear; others are unpleasant to our ears. In a day, you probably hear hundreds of different sounds.     All sounds are different. Some may be soft; others may be loud. Some sounds are high; others are low. Some sounds are useful. Without sound we cannot talk or listen to one another. The ringing alarm clock (闹钟)makes people wake up. The hooting of a horn (喇叭声) on the road warns careless people of danger. Some sounds are harmful. When planes fly low over the land, the very loud sounds can damage the houses. Very loud sounds can even make people deaf. We know sound travels about one kilometer in three seconds. In a thunderstorm you see the lightning first and then hear the thunder. This is because light travels much faster than sound. Next time you see lightning, count the number of seconds before you hear the thunder. Divide this number by 3. This will tell you how many kilometers away the thunder storm is. 1. All the sounds in the world are pleasant to hear, aren’t they? 2. Why do people hoot the car? 3. What may happen when planes fly low over the land？ 4. How fast does the sound travel? 5. Why do we see the lighting first and then hear the thunder? 1 学科网（北京）股份有限公司 $$Three, listen to the passage and tell whether the following statements are true or false. 判断下列句子是否符合你听到的短文内容，符合的用T表示，不符合的用F表示。Good afternoon, boys and girls. I have something important to to tell you, we are going to do some cleaning after school. The radio says IT will be windy at night, so please remember to close the doors and windows when you leave. Please don't forget to put on more clothes. mr. Wang is a way today. He is ill in hospital. I hope you can go to see him that you don't need to buy him anything. By the way, there is a lot of homework this evening. You must finish doing IT and bring IT to school tomorrow morning. You'd Better not watch T, V till too late. Now let's begin our cleaning. Good afternoon, boys and girls. I have something important to to tell you. We're going to do some cleaning after school. The radio says IT will be windy at night, so please remember to close the doors and windows when you leave. Please don't forget to put on more clothes. mr. Wang is a way. today. He is ill in hospital. I hope you can go to see him, but you don't need to buy him anything. By the way, there is a lot of homework this evening. You must finish doing IT and bring IT to school tomorrow morning. You'd Better not watch T, V till too late. Now let's begin our cleaning. Four, listen to the passage and complete . the sentences. 下列内容每空格限填一词。Hello, i'm David. Let me tell you something about my school. There is a new library in our school. IT is a White building. Its big windows are shining in the sun. There are a lot of Green trees around IT looks very beautiful. There are about twenty thousand books in the library, and there are four reading rooms. Senator, one is for the teachers. The others are for the students. After class, we can read newspapers, magazines and books there every friday afternoon. We borrows books from the library, and we can keep them for two weeks. Books are our good friends. There are a lot of exciting things and new ideas in them. We love books very much. We love our school library too. Hello, i'm David. Let me tell you something about my school. There is a new library in our school. This is a White building. Its big windows are shining in the sun. There are a lot of Green trees around IT looks very beautiful. There are about twenty thousand books in the library, and there are four reading rooms in IT. One is for the teachers. The others are for the students. After class, we can read newspapers, magazines and books there. Every friday afternoon, we borrows books from the library, and we can keep them for two weeks. Books are our good friends. There are a lot of exciting things and new ideas in them. We love books very much. We love our school library too. 六年级第二学期课堂练习 Listen to the passage and tell whether the following statements are true or false 5% ( )1. They are going to have a sports meeting. FFTFT ( )2. It will rain at night. ( )3. The speaker asks the students to close the windows when they leave. ( )4. The students needn’t bring homework to school tomorrow morning. ( )5. The speaker asks the students not to watch TV till too late. Good afternoon, boys and girls. I have something important to tell you. We’re going to do some cleaning after school. The radio says it will be windy at night, so please remember to close the doors and windows when you leave. Please don’t forget to put on more clothes. Mr Wang is away today. He is ill in hospital. I hope you can go to see him. But you don’t need to buy him anything. By the way, there’s a lot of homework this evening. You must finish doing it and bring it to school tomorrow morning. You’d better not watch TV till to late. Now let’s begin our cleaning. Listen to the passage and complete the sentences. (听短文，完成下列内容，每空格限填一词)10% 1. The new library in our school is a white building. 2. There are four reading rooms in the library. 3. Students can __borrow_ books ___from the library every Friday afternoon. 4. They can keep the books for __two weeks_. 5. Students can find exciting things and __new ideas_ in the books. Hello, I’m David. Let me tell you something about my school. There is a new library in our school. It is a white building. Its big windows are shining in the sun. There are a lot of green trees around. It looks very beautiful. There are about twenty thousand books in the library. And there are four reading rooms in it. One is for the teachers, the others are for the students. After class, we can read newspapers, magazines and books there. Every Friday afternoon, we borrow books from the library and we can keep them for two weeks. Books are our good friends. There are a lot of exciting things and new ideas in them. We love books very much. We love our school library, too. Spell the word according to the given phonetic sound.（看音标写单词）5% 1. Bob was angry because someone took his food __without_ asking. [wɪˈðaʊt] 2. Where else can you find these __signs_. [saɪnz] 3. My best friend has many _hobbies_ , such as dancing and singing. /ˈhɒbiz/ 4.The girl in red skirt is __slimmer_ than her friend. /ˈslɪmə(r)/ 5. Everyone was busy reading books, so nobody _noticed_ /'nəutist/him. Choose the best answer. (选择最恰当的答案，用A, B, C或D表示，填入括号内)（20分） ( C )1. My sister is ________ easy-going girl, and she can play ________ violin well. A. a; the B. the; an C. an; the D. the; a ( B )2. Angela is flying to New Zeeland soon. She will arrive __ Auckland ___ the morning of March 18. A. at…in B. in…on C. in…in D. at…on ( C )3.It's hard to make a decision because __________ has his or her own strong points. A. someone B. anyone C. everyone D.no one ( B )4. There are about ________ students in our grade. A. hundred of B. three hundred C. three hundreds D. hundreds of ( C )5.According to the map, you can find the bus station on _________ side of the street. A. other B. another C. the other D. others ( C )6. He made ________ mistakes in the test, so he got a high mark. A. little B. a little C. few D. a few ( B )7. There are many ways to keep them ______. A. save B. safe C. safety D. safely ( D )8. Please listen to the teacher as _________ as possible so that you can understand the text better. A, careful B, much carefully C, more carefully D, carefully ( B )9.________ important the rules are to our life! A.What B.How C.What a D.What an ( C )10. Mike, ___________the flowers in the park. A. don't pick up B. doesn't pick C. don't pick D. don't pick on ( C )11. Mind your steps as you go, _____ you’ll fall down onto the wet ground. A. and B. but C. or D. so ( A )12.The students stopped __________ and started ___________ when the teacher came. A.talking; reading B.talking; read C.to talk; reading D.to talk; to read ( C )13.In the future, people will__________live and work in space stations. A.can B.able to C. be able to D.could ( A )14.That funny story made us all ________. A. laugh B. to laugh C. laughing D. laughed ( A )15.There a talent show in the school hall tonight. A. is going to be B. is going to have C. will have D. are going to be ( D ) 16.The police told us __________football in the street because it was dangerous. A. don't play B. doesn't play C. to not play D. not to play ( B )17. There is still some milk at home. We ________ buy any at the supermarket now. A. don’t need B. needn’t C. needn’t to D. need to ( C )18.I suggest __________ abroad during this coming summer holiday. A. to travel B. travel C. travelling D. travels ( B )19. If it rains heavily, we ______ some indoor activities instead of playing football. A. do B. will do C. did D. have done ( B ) 20. ---Would you mind my using your printer for a while? ---_________________. A. Never mind B. Certainly not C. You’re welcome. D. Sorry, I can’t. Complete the following passage with the words in the box.Each can be used only once 6% A. its B. countries C. much D. save E. yourself F. friendly Every day, a lot of food goes uneaten(没吃) and ends up in the trash, while many people in poor ___B__1____ have nothing to eat. The next time you sit down to have a delicious dinner, ask ___E_2_____ ” How much food can I eat?”, it will help you cut down on waste. The most important thing to remember is to be __F__3____ to the environment(环境). Just take as __C__4____ as you can eat, don’t buy things you neither want nor need, and leave litter in ____A_5_____ right place. If everyone could cut down on waste in daily lives, the world would be great. We know that many restaurants have joined the “clear your plate” campain(光盘行动) to D 6 food. We students should do the same in our daily life, especially(尤其是) when having dinner with our friends and relatives. Complete the sentences with the given words in their proper forms 8% 1. Our classroom rules are similar to __theirs__(they) 2. We usually plant trees on the __twelfth_of March, the Tree Planting Day. (twelve) 3. Attention, please. I have an important ___announcement_ (announce) to make. 4. At the __beginning_ of the meeting, all the people stand up to sing a song. (begin) 5. The old man looked __unhappy when he heard the bad news. (happy) 6. It’s impolite to talk __loudly_ in public. (loud) 7. Thank you for _offering (offer) me so much help. 8. Paul and Lu Yao are _interested__ in Science club. (interest) Rewrite the following sentences as required.（根据所给要求，改写下列句子, 每空格限填一词) (14分) 1. She needs someone to make a poster about rules. (改为否定句) She _doesn’t need_ anyone to make a poster about rules. 2. Don’t wear open-toed shoes in the lab. (保持句意不变) You __mustn’t wear_ open-toed shoes in the lab. 3. He will come back in a week. (划线提问) __How soon__ will he come back? 4. Shall we ask other students about our programme? (保持句意不变) __What/How about__ asking other students about our programme? 5. Linda won the first prize with the help of her teacher. (对画线部分提问) ___How did__ Linda win the first prize? 6. Please give your seat to anyone in need, _will you__?(改为反意疑问句) 7. you, and, go to the lab, do some experiments, ready to, are (连词成句) Are you ready to go to the lad and do some experiments__? Translation （把下列中文翻译成英文）（10分） 1. 不同的人对这个故事有不同的观点。(opinion, on ) Different people have different opinions on the story. 2. 她正在和我们分享一个规则故事。 (share) She is sharing a rule story with us. 3. 当她唱歌的时候，每个人都嘲笑她。 (laugh at) When she sings, everyone will laugh at her. 4. 每个人都能从这个寓言中学到一些特别的东西。(learn from) Everybody can learn something special from the fable. 5. 请在黄线处稍等，注意空隙。(wait, mind) Please wait at the yellow line and mind the gap. Reading comprehension and writing. (阅读理解) (32分) A. Choose the right sentences to complete the dialogue. （5分） ( A．Do you kno w when the party will start? B．What do you want to talk about? C．Eve rything about the future is OK. D．Can you come over and help me? E．And I’m sure if you go to the party, you’ll have a great time. F．Wow, that’s a great idea. ) Daughter: Mummy, I am going to a group chat party with my classmates. Mother: Oh, great, honey! I’m glad you can make it to a group activity. Daughter: 1 D Mother: Sure, I’d love to. What’s it all about? Daughter: Let me see, environment, future cars, science… 2 C Mother: Cool topic. 3 B Daughter: I have no idea, but I don’t really want to discuss cars and pollution. Mother: Maybe you can try to talk about what the future schools will be like. Daughter: 4F Thank you, Mom. Mother: No worries, darling! 5 E B. Choose the best answer. (根据短文内容, 选择最恰当的答案, 用A, B, C或D表示, 填入括号内) 6% On June 1st this year, the Green Shopping Centre will hold some fun activities to celebrate Children’s Day. Let’s Have Fun Art show. 9:00-12:00 Art Hall, 1st floor Lunch 12:00-13:00 Flower Restaurant, 2nd floor Music show 13:00-14:30 Concert Hall, 1st floor Sports meeting (family activities) 14:30-17:00 GSC Sport Area, 6th floor Age: 6-12 years old. Every child should come with at least one adult. Ticket: Free Prize for the sport meeting: 1st prize (two children): a big toy and a book 2nd prize (five children): a small toy and a book 3rd prize (eight children): a book If you want to join us, please sign up for the activities at our WeChat official account (微信公众号) from May 18th to May 24th. The number of people for each activity is 50, and every family can choose two activities at most. Here you can have a good time with your family and may make some new friends. Looking forward to seeing you on Children’s Day! ( B )1．How long does the lunch break last? A．two hours B．one hour C．one and a half hours D．half an hour ( C )2．What can we learn about the music show? A．It is on the 6th floor. B．It has two 1st prizes. C．It is in the afternoon. D．It is a family activity. ( D )3．Who can join in the sports meeting? A．12-year-old Ben and his younger brother. B．Andy and her 5-year-old son. C．15-year-old Amy and her sister. D．John and his 9-year-old daughter. ( D )4．Mike didn’t successfully sign up for the sports meeting with his 8-year-old son probably because________. A．He only chose one activity B．he forgot to pay for the ticket C．he signed up for it on May 21st. D．he was the 51st one to sign up for it. ( C )5.Kim is the fifth girl to win 2nd prize, what can she get ? A. a big toy and a book B. a small toy and two books C. a small toy and a book D. a book ( B )6．Where can we probably read this passage? A．In a fable. B．In a newspaper. C．In a dictionary. D．In a storybook. C. Read the passage and choose the proper word or phrases to complete the passage.6% A dog was heading home after he spent a day ___1___ a big, delicious bone. It was getting dark(黑暗的）and on the way he passed by a river. He saw his reflection(倒影）in the river. He was very____2_____.He thought he saw____3_____dog with a bigger, better bone than the one he had. He had a bone, but he wanted that bone too. _____4______ thinking twice, he shouted at the "other" dog and tried to get his bone. When he shouted, his bone fell out of his mouth and dropped into the river. Then he realized what had happened. He felt very regretful(后悔的）. He had to go home with no bone at all. We always want more than we have, _____5_____ when we take a look at what we have, we might realize that the bone we have is enough. It doesn't mean that we shouldn't go for bigger and better things, though. We should just be careful about always wanting more. We should _____6_____if the bigger one we want is the real big one. Our wish to have our cake and eat it will probably make us have nothing at all. ( C )1.A.find B.to find C.finding D.found ( B )2.A.surprising B.surprised C.sad D.happy ( C )3.A the other B.other C.another D.others ( B )4.A.With B.Without C.After D.Before ( A )5.A.but B.and C.so D.because ( C )6.A.find B.put out C.find out D.put up D. Answer the following questions.（回答问题） 5% The world is filled with many interesting sounds. Some are very pleasant to hear; others are unpleasant to our ears. In a day, you probably hear hundreds of different sounds.     All sounds are different. Some may be soft; others may be loud. Some sounds are high; others are low. Some sounds are useful. Without sound we cannot talk or listen to one another. The ringing alarm clock (闹钟)makes people wake up. The hooting of a horn (喇叭声) on the road warns careless people of danger. Some sounds are harmful. When planes fly low over the land, the very loud sounds can damage the houses. Very loud sounds can even make people deaf. We know sound travels about one kilometer in three seconds. In a thunderstorm you see the lightning first and then hear the thunder. This is because light travels much faster than sound. Next time you see lightning, count the number of seconds before you hear the thunder. Divide this number by 3. This will tell you how many kilometers away the thunder storm is. 1. All the sounds in the world are pleasant to hear, aren’t they? No, they aren’t 2. Why do people hoot the car? Because it can warn careless people of danger. 3. What may happen when planes fly low over the land？It may damage the houses and even make people deaf. 4. How fast does the sound travel? One kilometer in three seconds 5. Why do we see the lighting first and then hear the thunder? Because light travels much faster than sound 1 学科网（北京）股份有限公司 $$