单项选择题

My mother is a light sleeper and is usually very ______ to any sound even as inaudible as the humming of a mosquito.

A. acute
B. keen
C. alert
D. immune
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单项选择题
The water-skier ______ over the water.
A. skimmed
B. floated
C. drifted
D. swam
单项选择题
Intellect is to the mind ______ sight is to the body.
A. that
B. how
C. what
D. which
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