One day when Isaac Newton was reading a book under an apple tree on the farm，an apple fell down and hit him on the head．For most people that would be the end of the story，but not for Newton．Why did the apple fall out of the tree? Does everything fall? What makes things fall? Can anything stop things from falling? Are the sun，moon，and stars falling? Why don't they ever hit the ground?

Newton spent many years answering these questions by thinking and doing experiments．He made up the law of gravity（引力定律）．According to this law everything pulls everything else to itself by a force（力）called gravity．How strong that force is depends on how heavy the things are and how close together．

Newton's law of gravity not only explained how things fall on earth，but how planets move around the sun and how moons move around planets．A friend of his，Edmund Halley，decided to try Newton's theory（理论）on comets（彗星）．People had been studying comets for hundreds of years but failed to understand them，so he decided to study their reports and compare them to Newton's theory．

Up till then people had thought that comets just came and went，and that nobody could know when or why．But Newton's law of gravity gave rules that Halley could use to study the records of comets．He found some reports of a big bright comet that he was sure was the same one，coming back every 75 years．He predicted（预测）when it would come back next．

Halley's prediction came true．Tile comet appeared at the right time as he predicted using Newton's ideas．This was enough to convince anybody who still didn't believe Newton．Halley's Comet has come a few times since then，always right on time．You'll be able to see it on its next trip near the sun and earth when you're old enough to be a grandparent．

1．The passage starts with a story to show _______．

A．it was such a funny one

B．Newton liked to eat apples

C．how much Newton liked reading

D．what led to Newton's discovery of gravity

2．How strong gravity is depends on _______ of the things according the Newton’s theory．

A．color and distance（距离）                      B．weight and distance

C．size and weight                                          D．size and color

3．According to the writer，Newton was especially different from others in that _______．

A．he liked reading under apple trees              B．he liked to find out how things worked

C．he was very quiet and patient                             D．he was so much interested in science

4．The underlined word convince in the last paragraph probably means “make people _______”．

A．believe                 B．doubt                   C．understand             D．relax

5．Which of the following is true about Edmund Halley?

A．He discovered a big bright comet

B．He helped Newton to create his theory．

C．He predicted when the same comet would come back．

D．He studied the comet for 75 years

 用所给单词的适当形式填空。

11. My apples are here. Where are __________(she)?

12. I can see two ____  ____(watch) on the desk.

13. You should do your homework__________(one), Danny.

14. They are going _________(fish) tomorrow.

15. The girls are dancing_________(happy) under the old tree.

16. Thanks for your ____   ___(invite). I'd love to come.

17. The boys are reading the _______  ___(interest) book, Harry Potter II.

18. I’m _______  ____(excite) at the _____   ____(wonder) news.

19. Carry the _________(shop) basketball with you, Sandy.

20. How many________(woman) are there in front of the supermarket?          

We know that trees are useful in our everyday life. They   1   us many things, such as wood, oxygen(氧气), rubber, medicines and many other things. They can   2   tell us a lot about our climate. The following are the reasons. If you cut across a tree, you can   3   that it has many rings. Most trees grow one   4   ring every year. Because of this reason, we know   5   a tree is. A tree over a hundred years old means that it has more than a hundred   6  . When the climate is dry(干燥的) or very cold, the trees do not grow very much and their rings are usually   7  . When it is wet and   8  , the rings are much thicker. If the rings are suddenly very thin or suddenly very thick, this means that the    9   changed suddenly. If we look at the rings on the trees, we can   10   about the climate for a hundred years. We can see how our climate is changing today.

1.                A．give           B．ask            C．get  D．tell

2.                A．too            B．as well          C．either    D．also

3.                A．hear           B．feel            C．see D．look

4.                A．new           B．old            C．young    D．short

5.                A．how tall        B．how old         C．how long D．how far

6.                A．leaves          B．apples          C．rings D．trees

7.                A．big            B．thin            C．thick(厚的)    D．long

8.                A．cold           B．cool            C．hot D．warm

9.                A．climate         B．things          C．people   D．life

10.               A．think          B．talk            C．learn D．change

阅读理解。

　　Mattie and Millie were two very old sisters. They lived at number 5 in our road. Mattie, 87, worked in the garden because she enjoyed that kind of work. Millie, 85, cleaned the house and cooked the meals.

　　One day Millie heard a sudden cry from the garden. Then her sister called out:“Millie, Millie! Come quickly!” Millie ran outside, “Why? What happened to you?” She asked. Mattie was on the ground, under an old apple tree.

　　“I think I've broken my leg,” Mattie said:“I can't get up. Help me, please.”

　　“How did it happen?”

　　“Well, I wanted to get those big apples from the top of the tree. So I climbed up. It was easy enough, but then a branch broke, and I came down very easily. We'll have to get the doctor.”

　　“You didn't think, did you?” Millie said. “That apple tree is very old. It's been there for forty or fifty years. The branches aren't strong enough… Don't climb it again.”

　　Millie helped her sister into the house. Then she telephoned the doctor.

　　“You haven't broken your leg,” the doctor said. “Stay in bed for a few days, I think it will be all right then.”

　　“She mustn't climb that tree again,” Millie said.

　　The doctor smiled at Mattie.“No, not that one,” he said, “climb a stronger tree next time.”

1．What happened to Mattie one day?

[　　]

A．She was sitting on the ground.

B．She fell and hurt her leg.

C．She cried for help.

D．She wanted to see a doctor.

2．Where were the big apples?

[　　]

A．On the low branches.

B．In Mattie's hands.

C．On the top of the tree.

D．On the ground.

3．Why did the branches break? Because________.

[　　]

A．Mattie was too fat

B．the branches were too long

C．the branches were not strong

D．there were too many big apples on them

4．How serious did Mattie hurt?

[　　]

A．She broke her leg.

B．She hurt seriously because she couldn't get up.

C．She must stay in bed from then on.

D．She would recover(恢复健康) in several days.

5．What was the doctor's advice?

[　　]

A．“You mustn't climb trees.”

B．“You mustn't climb that tree, but other strong ones.”

C．“Don't climb stronger trees next time.”

D．“Do what you like.”

A long time ago, there was a big apple tree. A little boy loved to come and play with it every day. But time went by, the little boy had    32   and he no longer played around the tree.
　　 One day, the boy came back to the tree. “Come and play with me,” the tree asked the boy. “I am no longer a    33   I can’t play with you now.” The boy replied, “I need    34   .” “Sorry, I don’t have any. But you can pick all my apples and    35   them.” The boy picked all the apples on the tree and left happily. He didn’t come back. The tree was sad.
　　 The other day, the boy returned and the tree was so    36   . “Come and play with me.” The tree said. “I need a house for my family. Can you help me?” “You can cut off my branches（枝干）to build your house.”   37   the boy cut all the branches of the tree and left happily.
The tree was glad to see him happy, but the boy didn’t come since then. The tree was lonely again. One hot summer day, the boy came back again after he left for so many years. “Sorry, my boy. But I don’t have    38   for you anymore.
“I don’t need much now, just a place to rest. I am    39   after all these years.” The boy replied. “Good! Please sit down with me and have a rest.” The boy sat down and the tree was glad and smiled with tears…
This is a story of everyone. The tree is like our parents. When we were young, we loved to play with them. But when we grow up, we    40   them, and only come to them when we are41    trouble. You may think that the boy is cruel（残忍）to the tree, but that’s how many of us are treating to our parents.
【小题1】A. grown up                B. dressed up               C. got up
【小题2】A. tree                    B. child                  C. toy
【小题3】A. money                   B. time                    C. help
【小题4】A. eat                    B. sell                   C. buy
【小题5】A. sad                     B. calm                     C. happy
【小题6】A. So                     B. But                     C. Because
【小题7】A. anything                B. something                C. nothing
【小题8】A. angry                   B. tired                   C. shy
【小题9】A. hate                   B. love                    C. leave
【小题10】A. at                     B. for                      C. in