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  3. My mother is a light sleeper,_____to any sound even as low as the humming of mosquito.

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

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问题 My mother is a light sleeper,_____to any sound even as low as the humming of mosquito.
选项 A、alert
B、acute
C、keen
D、immune
答案A
解析 alert意为“警惕的，提防的”，be alert to sth．表示“对……很警觉，能够察觉”；acute意为“敏锐的”，且不跟to构成题干中想要的意思；keen意为“热心的，渴望的”，一般与介词on搭配使用；immune意为“免疫的”，一般与介词to搭配使用。
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