If you look at the sky one night and see something moving and shining that you have never seen before, it might be a comet (彗星).

　　A comet sometimes looks like a star. Like a planet, a comet has no light of its own. It shines from the sunlight it reflects (反射). Like the earth, a comet goes round the sun, but on a much longer path (轨道) than the earth travels.

       If a comet isn’t a star, what is it then?

　   Some scientists think that a large part of a comet is water frozen into pieces of ice and mixed with iron and rock dust and perhaps a few big pieces of rock. When sunshine melts (融化) the ice in the comet, great clouds of gas go trailing after it. These clouds, together with the dust, form a long tail.Many people perhaps have seen a comet. However no one knows how many comets there are. There may be millions of comets, but only a few come close enough for us to see.

　　An Englishman named Edmund Halley, who lived from 1656 to 1742, found out a lot about the paths that comets take through the sky. Some comets move out of our sight and never come back. Others keep coming back at regular times. A big comet that keeps coming back was named after Halley because he was the one who worked out when it would come back again. Maybe you have ever seen Halley’s Comets because the last time it came close to the sun and the earth was in the year 1986. Then people all over the world were outside at night to look at it. You will probably be able to see Halley’s Comets when it comes near the earth again.

1.A comet is like ________.

A. sun      B. moon     C. sunlight    D. the earth

2.A large part of a comet is ______.

A. water and rock

B. water frozen into pieces of ice and mixed with iron

C. ice, iron and rock dust

D. only a few big pieces of rock

3.Maybe many people _______.

A. haven’t seen any comets      B. have seen all comets

C. have seen a comet at daytime  D. have seen a comet

4.Some comets keep coming back ________.

A. at any time  B. at noon  C. at regular times  D. at daytime

5.Halley’s Comets came back _____.

A. in 1990    B. in 1980     C. in 1986      D. in 1989

　  Tom and Fred were talking about the year 2050.
　　“What will   1  be like in the year 2050?” asked Tom.
　　“I don’t know,” said Fred. “What do you think?”
　　“Well, no one knows. But it is __2__ to guess,” said Tom. “In the year 2050 everybody will carry a pocket (袖珍) __3___. The computer will give people the __4__ to all their problems. We shall all have telephones in our pockets,__5___ . And we’ll be able to talk to our friends all over the world. Perhaps(也许) we’ll be able to ___6__ them at the same time. Machines will do ___7___of the work, and people will have more__8__. Perhaps they will work only two or three days a week. They will be able to fly to the moon by spaceship and spend their holidays there.”
　　“I’m very _9__to hear that. I hope to fly to the moon. And I hope I’ll be able to live _10___,” said Fred. “Won’t that be interesting? Just like a fish.”

Tom and Fred were talking about the year 2050.
　　“What will   36  be like in the year 2050?” asked Tom.
　　“I don’t know,” said Fred. “What do you think?”
　　“Well, no one knows. But it is __37__ to guess,” said Tom. “In the year 2050 everybody will carry a pocket (袖珍) __38___. The computer will give people the __39__ to all their problems. We shall all have telephones in our pockets,__40___ . And we’ll be able to talk to our friends all over the world. Perhaps(也许) we’ll be able to ___41__ them at the same time. Machines will do ___42___of the work, and people will have more__43___. Perhaps they will work only two or three days a week. They will be able to fly to the moon by spaceship and spend their holidays there.”
　　“I’m very _44__to hear that. I hope to fly to the moon. And I hope I’ll be able to live _45___,” said Fred. “Won’t that be interesting? Just like a fish.”

It seems to be strange to you there is a blind spot(点) on the eyes. Here is an interesting experiment that can make something disappear, when one eye is open.

　　Make a card about the size of a postcard and write two English letters L and R on it, L on the left and R on the right. First, hold the card about 80 cm away and you see both the letters. Then close your right eye and look at the letter R only with your left eye. And now, as you move the card slowly towards you, you’ll find the letter L disappearing. But if you move the card nearer to your face, the letter will be seen again. Now do the same experiment with your left eye closed, you’ll find the letter R disappearing.

Why does the letter disappear? It is because there is a blind spot on the eye. When the image of the letter falls on the blind spot, it won’t be seen. That is why either of the letters disappears.

1.The writer of the passage thinks that _____ there is a blind spot on the eye.

A．few people know   B．no one knows      C．most people know   D．all the people know

2.In which order should you do the experiment?

①Hold the card  ②Move the card nearer   ③Close your right eye

④Write two English letters  ⑤Look at the letter R   ⑥Make a card

A．④⑥①②③⑤      B．①③⑥④⑤②      C．⑥①④③②⑤      D．⑥④①③⑤②

3.The passage mainly tells us _______.

A．how to find the blind spot                 B．an interesting experiment

C．where the blind spot is                   D．there is blind spot on the eye

配对阅读? 左栏是五个中学生遇到的难题，某报专栏编辑给他们的七个建议。请根据五个中学生遇到的难题为他们选出最合适的建议，并将答题卡上对应题目所选的选项涂黑。

1.Sometimes I get angry easily and shout at my friends．That makes them think I’m not being friendly to them．

2.In my teachers’eyes, I am a good student．Both my classmates and my parents also think so．No one knows what my problem is．I often feel worried about my school work．

3.My parents never allow me to play computer games at all．They want me to study all day and do well in my exams．I feel unhappy．

4.I want to join in some after-school activities, but my parents think they are too dangerous and don't allow me to go out alone．

5.My mother gets me to take piano lessons．She makes it a rule that I must practice two hours a day．I really try my best, but I just can't play well． ????????????? A．Let your parents know you will not be alone．Also, you can ask a teacher to talk to your parents about the after-school activities．

B．Don't worry．You can still have some indoor sports．

They are also fun．

C．Don't worry, even great piano players have to practice. Hard work and a lot of practice are the only ways to become a good piano player．

D．When you feel angry you should stop talking and count to ten or walk away until you keep quiet．

E．Tell your friends how you are feeling．You are in a

new class, so you still need their friendship．Also, you can make new friends．

F．Don't worry．Everybody worries about their school

work, even those students like you who study well.　Find a hobby or a sport to help you relax for a while．

G．Tell your parents that many kids play computer games and do well at school, too．Ask them to let you play computer games for a short time on weekends．