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. vigorous
D. mortal

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单项选择题
In American cities, traffic jams are （） because citizens in suburb have to drive every day to central business areas to work.

A. activated
B. aggravated
C. irritated
D. propagated
单项选择题
（34）（）

A. Still
B. Anyway
C. Besides
D. Nevertheless
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