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

試題分析：句意：---這些日子有許多霧天。我們都想知道為什么空氣被污染的這么嚴重。根據(jù)句子意思，故選B.
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