单项选择题

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.

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热门试题

单项选择题

To live a completely sedentary lifestyle ( Line 7, ParA. 1 ) means______.

A．to "live an inactive life"
B．to "live a decent life"
C．to "live a life with complete freedom"
D．to "live a life of boredom"

单项选择题

Which of the following is NOT mentioned in the passage

A．People usually feel depressed when their friends move away.
B．People may call and write to their friends.
C．People like their new friends very much if they get to know them.
D．People must depend upon their friends for everything.