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
A man who could () such treatment was a man of remarkable physical courage and moral strength.

A. bear up on
B. stand up to
C. insist on
D. persist in
单项选择题
Our research has focused on a drug which is so()as to be able to change brain chemistry.

A. powerful
B. influential
C. monstrous
D. vigorous
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