单项选择题

You can' t ______your promise; all the people here are depending on you.

A．back off
B．back up
C．back on to
D．back out of
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单项选择题
The two astronauts have splashed down in the Pacific Ocean, only five miles from the aircraft carrier that was______ for the recovery mission.
A．detach
B．dispatched
C．devote
D．dismantled
单项选择题
It is possible to find out if a person has adapted to the changes of routine by measuring his body temperature because______.
A．body temperature changes when the cycle of sleep and wakefulness alternates
B．body temperature changes when he changes to night shift or back
C．the temperature reverses when the routine is changed
D．people have higher temperatures when they are working efficiently
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