A. Above 6,515 meters. B. Less than 6,515 meters. C. About 17,000 meters. D. Less than 17,000 meters. 参考答案:B 答案解析:[听力原文]11-13 Many people know the story of Noah’s ark. The three major world religions believe
第32题: [单项选择]A light sleeper is usually very ______ to any sound even as inaudible as the humming of a mosquito. A. acute B. keen C. alert D. immune 参考答案:C 答案解析: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。