5．如图所示.用长为L的细绳拴着质量为m的小球在竖直平面内做圆周运动.则 A．小球在最高点时所受向心力一定为重力 B．小球在最高点时绳子的拉力不可能为零 C．若小球刚好能在竖直面内做圆周运动.则——青夏教育精英家教网—

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5．如图所示，用长为L的细绳拴着质量为m的小球在竖直平面内做圆周运动，则(　　　 )

A．小球在最高点时所受向心力一定为重力

B．小球在最高点时绳子的拉力不可能为零

C．若小球刚好能在竖直面内做圆周运动，则其在最高点速率是

D．小球在圆周最低点时拉力可能等于重力

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4．物体做匀速圆周运动时，下列物理量不发生变化的是( 　　)

A．动能　　 B．线速度　　　 C．加速度　　 D．向心力

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3．汽车以额定功率从水平路面上坡时，司机换挡目的是(　　　)

　 A．增大速度，增大牵引力　　 B．减小速度，减小牵引力

　 C．增大速度，减小牵引力　　 D．减小速度，增大牵引力

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2．游泳运动员以恒定的速率垂直河岸横渡，当水速突然增大时，对运动员横渡经历的路程、时间发生的影响是(　　 )

A．路程增加、时间增加　　　　　 B．路程增加、时间缩短

C．路程增加、时间不变　　　　　 D．路程、时间均与水速无关

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1．许多科学家在物理学发展过程中作出了重要贡献，下列叙述中符合物理学史实的是

A．哥白尼提出了日心说并发现了行星沿椭圆轨道运行的规律。

B．开普勒在前人研究的基础上，提出万有引力定律

C．牛顿提出了万有引力定律，并通过实验测出了万有引力常量

D．库仑在前人研究的基础上通过扭秤实验研究得出了库仑定律

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(17-20)

People in Quiet Town are very sad that their old friend, Time River, is facing the end of its life next October.　 The river 　17.　 a lot to the people in the town.　 They all grow up and live with it all their lives. 　　 In the old times, people in the town 　18.　 their houses on both sides of the river.　 The houses in each block shared a public washing room.　 On Mondays, people came and washed their clothes together there.　 They hung their clothes at the back of each house.　 Those clothes with different colors 　19.　 a beautiful picture along the river.
Now Time River is going to be filled in to make more land to build on.　 People are happy that they 　20.　 more living space.　 But at the same time, they feel sorry that they must say good-bye to their old friend.　 So they have decided to give a party one day a year to remember the river.
　　　　　　　　　　　　　　　　　& hung(原形为 hang)悬挂

17. (A) means　　　　　　　　　　 (B) is meaning　　　　　　 (C) will mean　　　　　　　　 (D) meant

18. (A) build　　　　　　　　　　　 (B) are building　　　　　 (C) have built　　　　　　　　 (D) built

19. (A) make　　　　　　　　　　　 (B) are making　　　　　　 (C) have made　　　　　　　 (D) made

20. (A) have　　　　　　　　　　　 (B) have had　　　　　　　 (C) will have　　　　　　　　　 (D) had

(21-23)

　　 A small town has a good chance of 　21.　 that can bring in a lot of money, if it has something special to be proud of.　 One example is Gukeng town of Yunlin, Taiwan.　 Gukeng has long been famous for growing good coffee, but the town didn’t start to make much money from it until some years ago.　 As more and more people have visited Gukeng for its coffee, the coffee farmers have begun to open their farms to the public.　 At these farms, people can have the fun of finding out where coffee comes from.　　22.　, coffee shops are opened all over Gukeng, and people can take a rest and taste delicious coffee on the sidewalks in or after a day’s visit.　 The new businesses make a better life possible for those who 　23.　 the town.　 They don’t have to leave the town to find jobs in other places. 　　　　　　　　　　　　　　　　　　　　　　　　　　　　& as 随着

21. (A) growing the best tea　 (B) starting a new business (C) selling old farming lands　 (D) opening a shopping center

22. (A) First　 (B) Also　 (C) However　 (D) For example

23. (A) live in　 (B) hear about　 (C) take a trip to　 (D) are interested in

(24-25)

Dr. Swan: Hello, Lynn.　 How can I help you?
Lynn: I was hit in the mouth when I was playing basketball.
Dr. Swan: Oh, that’s too bad!　 Let me check.　 Now, open your mouth, please.
　
(Lynn opens her mouth.)
　
Dr. Swan: Well… you’re lucky.　 I need to work on only two teeth.　 I’ll fill them first and then give you some medicine to take after meals.　 Is that OK with you?
Lynn: Much more than OK!　 I thought they would have to be taken out.　 But can I eat anything after you do it?　 I have a date at seven o’clock tonight.
Dr. Swan: Don’t worry.　 You can have soft food after 30 minutes, and then anything after four hours.
Lynn: Thank you so much, Dr. Swan.
Dr. Swan: No problem!　 Be careful next time you are playing sports!
　　　　　　　　　　　　　　　　　　　　　　　　　　　& soft 软的

24. Which is NOT true about Lynn? (A) Two of her teeth need fixing.　　 (B) She needs to take medicine for her teeth. (C) She should stay away from food until tomorrow. (D) Her teeth got hit when she was playing basketball.

25. What does it mean? (A) Filling the teeth. (B) Brushing the teeth. (C) Checking the teeth. (D) Taking the teeth out.

(26-28)

　I wish my mom and dad would be nice to each other and get together again.　 If that happens, I will help children cross the street every day. 　　　　　　　　　　 by Hank

　I hope my grandpa will get well quickly.　 If he can leave the hospital and come home, I will give away all my money to the hospital. 　　　　　　　　　 by Grace

　　 Write down your wish on the Wish Tree.　 And tell the tree what you’ll do for others if your wish comes true.　 Who knows?　 The tree may do magic for you.

　I want to become a popular movie star.　 Make my wish come true and I will save time to teach my fans how to look younger. 　　　　　　　　　 by Willy

　If I can turn into a smart and beautiful girl, I will share all my clothes with my sisters. 　　　　　　　　　 by Nina

26. What can we learn about the Wish Tree? (A) It tells people’s future.　　　 (B) It collects people’s name cards. (C) It helps people to think of others.　　 (D) It grows bigger when a wish comes true.

27. Which is most likely true?　　　　　　　　　　　　　　　& likely 可能 (A) Nina is a movie star.　　　 (B) Grace works in the hospital. (C) Willy will teach people how to make a movie. (D) Hank would like to keep children safe on the road.

28. Who does NOT write about his or her family? (A) Grace.　　　　　　　　　　 (B) Hank.　　　　　　　　　　 (C) Willy.　　　　　　　　　　　 (D) Nina.

(29-30)

　　 Read Cindy’s diary and answer the questions.

Nov. 13, 1990 　　 Today I got a letter from Jenny, my new friend in America.　 I wrote her last week, and it was my first time to write a letter in English.　 I was worried that she wouldn’t get my letter.　 But she did, and she wrote back a nice long letter.　 She told me a lot about her family, school life, and the things she likes to do on holidays.　 I found we both love watching basketball games and think of Michael Jordan as the greatest player ever. 　　 I can’t wait to get a letter from Jenny again.　 It’s so much fun to share things with a foreign friend.　 In my next letter, I will tell her some interesting things about my school. 　　　　　　　　　　　　　　　　　　　　　　　　& diary 日记

29. What does she did mean? (A) Jenny got the letter.　 (B) Jenny wrote in English. (C) Jenny wrote back a nice long letter. (D) Jenny told Cindy about her family and school life.

30. Which is said about Cindy? (A) She is a sports fan.　 (B) She will visit Jenny. (C) She wants to teach Jenny to speak Chinese.　 (D) She often writes to foreign friends in English.

(31-32)

Joyce: Can you help me take care of my roses?　 I’ll be away for two weeks.
Ryan: Are you crazy?　 Don’t you know I’m a flower killer?
Joyce: Why’s that?　 I remember you have a beautiful garden with all kinds of
flowers.　 I think you’ve been taking good care of them.
Ryan: Not me.　 It’s my dad.　 He is good at growing trees and flowers.　 I
think you should ask someone else for help.　 I’m really not the right
person.
Joyce: But I’m leaving tomorrow morning!　 There’s no time to look for
someone else.　 Please!　 All you have to do is to water my roses every
two days.　 Here’s the key to my house.
Ryan: It’s just as easy as that?
Joyce: Yeah, just as easy as that!
Ryan: Well… will you kill me if anything goes wrong?
Joyce: Maybe, but I believe you’ll do just fine.

31. Why does Ryan say he is a flower killer? (A) He likes to pick up flowers.　 (B) He makes girls crazy for him. (C) He cannot keep flowers living long. (D) He does not like to have flowers in his house.

32. If Joyce’s roses are watered on the afternoon of May 5, when should they be watered next time?　 (A) On May 6.　 (B) On May 7.　 (C) On May 9.　 (D) On May 10.

33. Which is said in the reading? (A) Ryan’s father has decided to help Joyce. (B) Joyce is going on business for two weeks. (C) Ryan’s father takes care of Ryan’s garden. (D) Joyce has brought her roses to Ryan’s garden.

　(34-35)

Yellow Dress By Janet Lee Mary had a yellow dress Bought from the department store. It looked as beautiful as the moon, And as bright as the sun. Mary wore all the time The yellow dress I felt so right. Every day from day to night I saw her in the dress so bright. “Buy me a yellow dress,” I cried to Mom and Dad, “As beautiful and bright As the dress the girl living near has!” I cried and cried and cried, Until they said with sad eyes, “We need food for your baby sister, And clothes for your coming brother.” Since then I’ve learned Mary’s yellow dress Is better to dream of Than to ask for.

34. Why does the writer say, “Every day from day to night / I saw her in the dress so bright”? (A) The writer lived with Mary. (B) The dress had sun shapes on it. (C) The writer liked the dress very much. (D) The dress was Mary’s school uniform.

35. What did the writer’s parents mean by their words? (A) They did not like the yellow dress. (B) They did not have money for a dress. (C) They already had a dress for her baby sister. (D) They would ask Mary where to buy the yellow dress.

(36-37)

　　 ES-ME is a fun computer program.　 Here is how it works: ˙ First, tell ES-ME your birthday. ˙ Then ask your question. ˙ Finally, you will get an answer from ES-ME. 　 Below are the four questions people most often ask, and the funny answers they get. 　　Q1: Will I get a good job? 　　ES-ME FSure you will, if you are able to do a good job. 　　Q2: When will I die? 　　ES-ME FYou’ll know when the time comes. 　　Q3: Can I find my true love? 　　ES-ME FYes you can, if there’s true love in the world. 　　Q4: What will be on my school test? 　　ES-ME FIt will be what you’ve been taught.

36. What does ES-ME do? (A) It takes tests. 　　　　　　　　　　　　　　　　　　　　　　 (B) It collects ideas. (C) It gives answers.　　　　　　　　　　　　　　　　　　　　 (D) It repeats questions.

37. What does You’ll know when the time comes mean in the reading? (A) You will die when you get old. (B) You should know time flies and never waits. (C) You can know when you will die only when you are dying. (D) You can believe time is the best medicine for a broken heart.

(38-40)

Dear Grandma, 　　 I’ve been in Bluelake for two months now.　 It’s a beautiful small city.　 Schools here begin at the end of August.　 I like my school and I’m having a great time teaching Art History here. 　　 I’m now living in an apartment with a friend.　 From the window of my bedroom, I can see a beautiful green hill with flowers and trees.　 Many people go there to have a picnic or to fly kites.　 I enjoy taking a walk there every day after work and watching the people. 　　 I miss you very much, Grandma, and I hope you can come and visit me here some day. 　　　　　　　　　　　　　　　　　　　　　　　　　　　　 Love, 　　　　　　　　　　　　　　　　　　　　　　　　　　　　 Jude

38. What is Bluelake? (A) A city.　 (B) A park.　 (C) A school.　 (D) An art museum.

39. What is Jude doing in Bluelake? (A) Working.　 (B) Studying.　 (C) Visiting a friend.　 (D) Taking a vacation.

40. Which picture best shows what Jude sees out of his bedroom window? (A)

　　　　　　　　　　　 (B)

(C)

　　　　　　　　　　　 (D)

(41-42)

　When I was a child, I could not wait to see the world.　 I grew like the spring flowers in the garden. 　When I was a teenager, I could not wait to leave home.　 I did not want to follow any rules, and I was as angry as the burning sun in the summer sky. 　But then, I learned to think carefully before doing anything.　 Both good and bad things in the past became parts of my life, like autumn harvests for a farmer. 　Now I am old.　 My body is weak, but my mind has become strong and clear because of those experiences in my younger days.　 I am like a winter leaf, ready to take a good rest. 　These are the four seasons of my life. 　　　　　　　　　　　　　　　　　　　　　 Elizabeth Owen 　　　　　　　　　　　　　　　　　　　　　 July 10, 2010 　　　　　　　　　　　　　　　　　　　　& harvest 收获　 leaf 叶子

41. What does four seasons mean in the reading? (A) Four times of life. (B) Four parts of the year. (C) Four parts of the body. (D) Four kinds of weather.

42. Which is most likely true about the writer?　　　　　　　　& likely 可能 (A) She is wiser than before. (B) She has a strong and healthy body. (C) She enjoys growing flowers in her garden. (D) She tried hard to forget what happened in the past.

　(43-45)

　I had a dream – a strange dream that has helped me to understand Eric much better. 　In the dream, Eric looked angry and said, “Melissa, I have something to tell you.” 　I’ve lived with Eric for more than five years.　 He is the cutest thing I’ve ever seen.　 I buy him fish and milk and lots of toy mice once a week.　 I even bought a small house for him, because he sometimes likes to be left only by himself.　 I love him with all my heart, and give him all I love. 　But what has gone wrong?　 In the dream Eric said angrily, “I don’t like fish.　 I don’t like milk.　 And toy mice?　 Are you crazy?　 I’m not a cat.　 And I don’t want to be a cat, either!”　 Then he ran back to his small house. 　After the dream, I know better: dogs don’t like fish or milk.　 And surely they do not like toy mice.　 Most important of all, they will let you know when they are really angry!

43. What can we learn about Eric in the reading? (A) He likes cats.　 (B) He is Melissa’s pet. (C) He is four years old.　 (D) He enjoys talking with Melissa.

44. Why was Eric angry in the dream? (A) He did not have many friends.　 (B) Melissa loved him the wrong way. (C) Melissa did not take him out for a long time. (D) There were too many mice in Melissa’s house.

45. Why did Melissa buy a house for Eric? (A) Eric did not sleep well in her room.　 (B) Eric needed more space for his toys. (C) Eric was too big to share a bed with her.　 (D) Eric did not always like to be with others.

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12．若a,b,c＞0且a (a+b+c)+bc=9,则2a+b+c的最小值 (　　 )

　　　 A．　　　　　 B．　 4 　　　　C．　 2　　　 D． 6