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  3. We don’t have beds in the spacecraft, but we do have sleeping bags. During the day, when we are working, we leave the bags tied

We don’t have beds in the spacecraft, but we do have sleeping bags. During the day, when we are working, we leave the bags tied

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问题     We don’t have beds in the spacecraft, 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 spacecraft flights everyone sleeps at the same time. No one has to stay awake to watch over the spacecraft; the craft’s computers call us on the radio.
    On the spacecraft, sleep-time doesn’t mean nighttime. During each ninety-minute orbit (轨道) the sun "rises" and shines through our windows for about fifty minutes, then it "sets" as the spacecraft takes us around the dark side of the Earth. To keep the sun out of our eyes, we wear black sleep masks.
    It is surprisingly easy to get comfortable and fall asleep in space. Every astronaut (宇航员) sleeps differently: some sleep upside down, some sideways, and 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 (漂浮) up to the flight deck (驾驶舱). 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 for a while, listening to music and watching the Earth go by under me.
When the astronauts are working, sleeping bags are fastened______.
选项 A、on the wall
B、to their seats
C、onto the flight deck
D、anywhere they like
答案A
解析 事实细节题。根据文章第一段第二句“During the day，when we are working，we leave the bags tied to the wall，out of the way．”可知，白天“我们”工作的时候，会把睡袋拴在墙上，不让它们挡道。因此，该题答案为A。
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