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
Except for coarse earthen-wares, which can be made from clay as it is found in the earth, pottery is made from special clays plus other materials mixed to achieve the desired results.（）

A．conventional
B．unique
C．genuine
D．crude
单项选择题
The English language contains a(n) （）of words which are comparatively seldom used in ordinary conversation.

A．altitude
B．latitude
C．multitude
D．attitude
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