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

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

admin2011-01-26  44
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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