单项选择题

The waste pipe is blocked; try sluicing it out with hot water.

A．rushing
B．brushing
C．crushing
D．flushing
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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
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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