单项选择题

（）is medical technology that allows the prolongation of life artificially while the world is already over-populated ?

A．Of what use
B．What use
C．Of which use
D．Which use

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单项选择题
Communicating orally involves more than reading or talking: gesture, posture, movements may all be ______ to it.
A. intrinsic
B. coherent
C. appealing
D. submissive
单项选择题
Tom could hardly （）his excitement as he knew that he had made a real discovery

A. conceal
B. reveal
C. show
D. discover
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