单选题：Why can all the astronauts sleep at the same time?

题目内容：
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：
答案解析：

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