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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单项选择题
He was a young man of barely eighteen years, evidently county ______ , and now, as it seemed, on his first visit to town.
A．brought up
B．bred
C．grown up
D．raised
单项选择题
Everybody likes him. He is very ______ with all his colleagues.
A．popular
B．familiar
C．close
D．vulgar
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