A light sleeper is usually very ______ to any sound even as inaudible as the hum

游客2025-05-08 7

问题 A light sleeper is usually very ______ to any sound even as inaudible as the humming of a mosquito.

选项 A、acute
B、keen
C、alert
D、immune

答案 C

解析 alert机警的，机敏的，be alert to为固定短语，对…很警觉。acute与keen都有“敏锐”之意(如目光、思维等)。immune免疫的。

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