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?

A．communication

B．monitoring the weather condition

C．doing some research

D．taking pictures小题2:The force that pulls the satellite towards the earth is created by ________.

A．the earth

B．the satellite itself

C．the rotation of the satellite

D．the rope小题3:Why can’t the satellites fly away?

A．Because of the force from the earth.

B．Because the satellite is too big.

C．Because of the force created by the rotation of the satellite around the earth.

D．Because people on earth have made ropes to tie the satellites tightly.小题4:The satellite will finally crashes down to the earth ________.

A．when it flies faster

B．when its speed slows down

C．when people cut the rope

D．when there is no electricity in it小题5:Which of the following is TRUE according to the passage?

A．There are four forces acting on the satellite.

B．The force of gravitation makes the satellite go round and round.

C．As time goes by, the satellite will finally fall down.

D．The satellite will stay in space forever.

My elder brother Steve, in the absence of my father who died when I was six, gave me important lessons in values（价值观念） that helped me grow into an adult.

Steve taught me to face the results of my behavior. Once when I returned in tears from a Saturday baseball game, it was Steve who asked me what happened. When I explained that my baseball had soared through Mrs. Holt’s basement window, breaking the glass with a crash, Steve encouraged me to admit to her. Although my knees knocked as I explained to Mrs. Holt, I offered to pay for the window from my pocket money if she would return my ball.

I also learned from Steve that personal property（财产） is a sacred（神圣的） thing. After I found a shiny silver pen in my fifth-grade classroom, I wanted to keep it, but Steve explained that it might be important to someone else in spite of the fact that it had little value. He reminded me of how much I’d hate to lose to someone else the small dog my father made with a piece of cheap wood. I returned the pen to my teacher, Mrs. David, and still remembered the smell of her perfume (香水) as she patted me on the shoulder.

Yet of all the instructions Steve gave me, his respect for life is the most unforgetful in my mind. When I was twelve I killed an old brown sparrow(麻雀)in the yard with a BB gun. Excited, I screamed at Steve to come and take a look. I shall never forget the way he stood for a long moment and stared at the bird on the ground. Then in a dead, quiet voice, he asked, “Did it hurt you first, Mark?” I didn’t know what to answer. He continued with his eyes firm, “The only time you should even think of hurting a living thing is when it hurts you first, and then you think a long, long time.” I really felt terrible then, but that moment stands out as the most important lesson my brother taught me.

小题1:What is the passage mainly about?

A．The relationship between Mark and Steve.

B．The important lessons Mark learned in school.

C．Steve’s important role in Mark’s growth stage.

D．Mark and Steve’s respect for living things.小题2:When Mark admitted his mistakes to Mrs. Holt, he ____.

A．was surprised

B．felt frightened

C．was light-hearted

D．cried before her小题3:From the third paragraph, we can know that Mark _____.

A．had a shiny silver pen

B．respected his teacher

C．hated his father very much

D．once owned a small wooden dog小题4:To Mark, which is the most important lesson Steve taught him?

A．Respecting life.

B．Being responsible for one’s behavior.

C．Being honest.

D．Respecting others’ property