单项选择题

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.

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单项选择题

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

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.