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
The most crucial problem any economic system faces is how to use its scarce resources.
A．puzzling
B．difficult
C．terrifying
D．urgent
单项选择题
Human facial expressions differ from those of animals in the degree to which they can be deliberately controlled and modified.
A．sufficiently
B．noticeably
C．intentionally
D．absolutely
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