阅读理解：
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, sleeptime 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.
问题：
1.When the astronauts are working, sleeping bags are fastened _________.
A.on the wall
B.to their seats
C.onto the flight deck
D.anywhere they like
【参考答案】A
[考点]事实细节题
【精析】A 根据文章第一段的第二句“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。
2.Why can all the astronauts sleep at the same time?
A.They have to follow the same timetable.
B.The radio will take care of the aircraft for them.
C.There are enough sleeping bags in the spacecraft.
D.There is no need for them to watch over the spacecraft.
【参考答案】D
[考点]事实细节题
【精析】D 根据文章第二段：“…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.”可知，因为飞船上有计算机监测飞船运行，所以不需要人为监测飞船的飞行情况。因此，该题的正确答案为D。
3.To relax himself before sleep, the writer often _________.
A.makes a bed
B.gets into his bag
C.listens to music
D.wears a sleep mask
【参考答案】C
[考点]事实细节题
【精析】C 根据文章最后一段的最后一句“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.”可知，作者在睡前会听一会儿音乐来放松自己。因此，正确答案为C。
4. How long does it take the spacecraft to go round the Earth?
A.Forty minutes.
B.Fifty minutes.
C.Ninety minutes.
D.Twenty-four hours.
【参考答案】C
[考点]推理判断题
【精析】C 通过文章第三段的第二句“During each ninety-minute orbit 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.”可知，飞船绕地球飞行一周的轨道时长为90分钟。因此，该题的正确答案为C。
5.The best title for this passage is _________.
A.Traveling in Space
B.Sleeping in the Spacecraft
C.Equipment Used by Astronauts
D.The Earth Seen from Outer Space
【参考答案】B[考点]主旨大意题
【精析】B 通过对全文的通读，可以知道，整篇文章谈论的都是宇航员如何在太空飞船上睡觉的情况。据此推断，文章的最佳标题应该为B。