问题 选择题

Scientists who study ________ noise say that ________ average noise level in New York is 72.5 decibels.

A./;the

B./;an

C.the;an

D.a;the

答案

答案:A

答案 A [noise为不可数名词,所以前面不加任何冠词,the average为固定用法,意为“平均”。]

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