题目内容

There are so many foggy days these days. We all wonder                   .
A. how is the air polluted          
B. why the air is polluted seriously
C. what are the real reasons
B

试题分析：句意：---这些日子有许多雾天。我们都想知道为什么空气被污染的这么严重。根据句子意思，故选B.
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