单项选择题

High pay may (enhance) productivity.

A．confirm
B．improve
C．determine
D．supplement
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单项选择题
There is less crime now; it seems that there is a (fall) in the crime rate.
A．decrease
B．incline
C．defeat
D．slope
单项选择题
The New Year is coming. We decided to give our room a (thorough) clean.
A．careful
B．complete
C．real
D．serious
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