单项选择题

The police （） against the severe difficulties they faced.

A. commented
B. contended
C. committed
D. competed

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单项选择题

He also repeated China’s peaceful foreign policy of maintaining independence and keeping（）in its own hands.

A. initiative
B. enthusiasm
C. solidarity
D. illusion

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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