单项选择题

My mother is a light sleeper, ______ to any sound even as low as the humming of a mosquito

A. alert
B. acute
C. keen
D. immune
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单项选择题
The work was almost complete when we received the order to（）no further with it.

A. progress
B. proceed
C. prompt
D. promote
单项选择题
According to the weather forecast, which is usually （）, it will snow this afternoon.

A. accurate
B. precise
C. exact
D. perfect
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