题目内容

Scientists who study ________ noise say that ________ average noise level in New York is 72.5 decibels.
A．/；theB．/；anC．the；anD．a；the
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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