The rockets take astronauts and man-made satellites into space. The satellites are used for communication, weather monitoring and research. But how do satellites stay up without falling down?
There are two opposite forces (力量) acting on the satellite. One of them is the force of gravitation (地心引力), which tries to pull the satellite towards the earth. The other force is created by the rotation (旋转) of the satellite around the earth. This force tries to take the satellite away from the earth. With these two forces, the satellite goes round and round. The gravitational pull of the earth (the force which pulls everything towards the ground) is like a rope which keeps the satellite from flying away.
Everything that goes up has to come down. It is only a matter of time before a satellite comes back to the earth. As time goes by, the satellite loses its speed, which makes the gravitational pull stronger than the force pulling it away. This makes the satellite crash (坠落) down to the earth.
【小题1】Which of the following uses of satellites is NOT mentioned?

Don’t believe it! It is only a         .

A、truth                                                 B、event                                       C、hoax

1 

     Billiards（台球） is my favorite ball sport. The English player Ronnie O’Sullivan and Chinese player Ding Junhui are   46   my favorite players. They play it very well. I hope I’ll be   47   to play it well, too. Of course, it is only a dream. Of the two players, I  48   O’Sullivan, because he played it so quickly in the races.

When I was nine, I   49_  this ball sport for the first time. My PE teacher, Mr. Xu, and I became good   50   because of billiards. I still remember that one day Mr. Xu and I played billiards   51   class. We were so excited that we both   52  the lunchtime. Suddenly, my father showed up, he was very angry with me.

Well, it is   53  to know the rules, but it is not easy to get a good   54   in the game. Now billiards is becoming more and more   55  in China, and more and more Chinese are enjoying it.

1.A.two B.both            C.all

2.A.able B.free            C.glad

3.A.love B.like            C.prefer

4.A.hit B.joined          C.played

5.A.athletes               B.friends          C.teachers

6.A.after  B.before        C.in

7.A.knew B.forgot          C.remembered

8.A.easy B.hard            C.difficult

9..A.rule                  B.score            C.player

10.A.boring                B.famous           C.popular

Billiards（台球） is my favorite ball sport. The English player Ronnie O’Sullivan and Chinese player Ding Junhui are   46  my favorite players. They play it very well. I hope I’ll be   47  to play it well, too. Of course, it is only a dream. Of the two players, I  48  O’Sullivan, because he played it so quickly in the races.
When I was nine, I   49_  this ball sport for the first time. My PE teacher, Mr. Xu, and I became good   50  because of billiards. I still remember that one day Mr. Xu and I played billiards   51  class. We were so excited that we both  52  the lunchtime. Suddenly, my father showed up, he was very angry with me.
Well, it is   53 to know the rules, but it is not easy to get a good  54  in the game. Now billiards is becoming more and more  55  in China, and more and more Chinese are enjoying it.
【小题1】A.two            B.both             C.all
【小题2】A.able           B.free             C.glad
【小题3】A.love           B.like             C.prefer
【小题4】A.hit            B.joined           C.played
【小题5】A.athletes       B.friends          C.teachers
【小题6】A.after          B.before           C.in
【小题7】A.knew           B.forgot           C.remembered
【小题8】A.easy           B.hard             C.difficult
【小题9】.A.rule          B.score            C.player
【小题10】A.boring        B.famous           C.popular