单项选择题

You will find the scenery is so beautiful if you view from the ______ of the hill.

A．ceiling
B．summit
C．mantle
D．roof
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单项选择题
They are working ______ time to fulfill the task according to the schedule.
A．against
B．over
C．ahead of
D．before
单项选择题
Radar is used to extend the ______ of man's senses for observing his environment, especially the sense of vision.
A．validity
B．liability
C．capacity
D．intensity
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