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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单项选择题
There is little doubt that the arts in America will be greatly ________ by the large numbers of European artists who are taking up residence and often citizenship in the United States.
A．erupted
B．enriched
C．erased
D．elicited
单项选择题
A passion for the theatre which may demonstrate all the ways of life can be a fairly satisfying ________ for life.
A．substance
B．imitation
C．repetition
D．substitute
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