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

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

选项 A、alert
B、acute
C、keen
D、immune

答案A

解析本题考的是形容词的上下文搭配。alert警惕的，警觉的，留心的，根据题意，选项A为正确答案。

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