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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单项选择题
The steadily rising cost of labor has greatly increased the cost of shipping cargo by water.
A. suddenly
B. gradually
C. excessively
D. exceptionally
单项选择题
The doctor has abandoned the hope to rescue the old man.
A. left
B. given up
C. turned down
D. refused
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