单项选择题

The substance can be added to gasoline to accelerate the speed of automobiles.

A．quicken
B．shorten
C．loosen
D．enlarge
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单项选择题
During the past ten years there have been dramatic changes in the international situation.
A．permanent
B．powerful
C．striking
D．practical
单项选择题
We should never content ourselves with only a little knowledge.
A．convince
B．satisfy
C．comfort
D．benefit
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