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”。]