C

　　We don't have beds in the space shuttle (航天飞机), but we do have sleeping bags. During the day, when we are working, we leave the bags tied to the wall, out of the way. At bedtime we untie them and take them wherever we've chosen to sleep.

　　On most space shuttle flights everyone sleeps at the same time. No one has to stay awake to watch over the space plane; the shuttle's #puters and the engineers at the Control Office do that. If anything goes wrong, the #puters ring a warning bell and the engineers call us on the radio.

　　On the space shuttle, sleep-time doesn't mean nighttime. During each ninety-minute flight around the earth, the sun "rises" and shines through our windows for about fifty minutes: then it "sets" as our flight takes us around the dark side of the Earth. To keep the sun out of sleep masks (眼罩).

　　It is surprisingly easy to get #fortable and fall asleep in space, and we sleep differently. Some sleep upside down, some sideways, some right side up. When it's time to sleep, I take my bag, my sleep mask, and my tape player with earphones and float up to the flight platform. Then I get into the bag, and float in a sitting position just above a seat, right next to a window. Before I pull the mask down over my eyes, I relax(放松)for a while, listening to music and watching the Earth，by under me.

　　When I'm in space I don't need as much sleep as I do on Earth. Maybe that's because when I am weightless, I don't feel as tired. Or maybe it's because I'm excited to be in space and don't want to waste time sleeping.

　　8. What do the shuttle people do with their sleeping bags while working?

　　A. Keep them where thy work.

　　B. Leave them where they sleep.

　　C. Place them on the beds.

　　D. Fix them to the wall.

　　9. During sleeping time, the job of watching over the shuttle is done by      .

　　A. the shuttle's radio

　　B. the shuttle's warning bell

　　C. people working in the shuttle

　　10. How often does the sun rise to people in the space shuttle?

　　A. Every 140 minutes.

　　B. Every 90 minutes.

　　C. Every 50 minutes.

　　D. Every 40 minutes.

　　11. What do we know about people sleeping in the space shuttle?

　　A.They sleep while listening to music.

　　B. They have difliculty falling asleep.

　　C.They Sleep in different positions.

　　D. They go to sleep when it is dark. 

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