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单选题
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
参考解析
解析：
细节题。短文的第二段第二句补充解释了原因“No one has to stay awake to watch over the spacecraft”，他们没有必要照看飞船。D项是对这句话的同义转述，正确选项。A项无中生有，文中没有提到他们必须遵守同样的作息时间，故排除。B项是对“the craft’s computers call us on the radio”的错误理解。C项答非所问，题目问的是所有人可以同时睡觉的原因，与睡袋是否足够没有关系。
细节题。短文的第二段第二句补充解释了原因“No one has to stay awake to watch over the spacecraft”，他们没有必要照看飞船。D项是对这句话的同义转述，正确选项。A项无中生有，文中没有提到他们必须遵守同样的作息时间，故排除。B项是对“the craft’s computers call us on the radio”的错误理解。C项答非所问，题目问的是所有人可以同时睡觉的原因，与睡袋是否足够没有关系。
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