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
He made an immense amount of money in business.
A.large
B.small
C.limited
D.little
单项选择题
The most crucial problem any economic system faces is how to use its scarce resources.
A.puzzling
B.difficult
C.terrifying
D.urgent
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