单项选择题

The police tried in vain to break up the protest crowds in front of the government building.

A. unskillfully
B. violently
C. ineffectively
D. eventually
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单项选择题
It has been said that the Acts provided a new course of action and did not merely regulate or enlarge an old one.
A. control
B. limit
C. replace
D. offset
单项选择题
We have a responsibility to ensure our nation’s continued prosperity and the most sensible way to do this is by investment in basic scientific research.
A. effective
B. efficient
C. significant
D. reasonable
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