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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