问题
单项选择题
Such problem （）air, water, and noise pollutions are becoming more and more serious in some big cities.
A.like
B.as
C.of
D.about
答案
参考答案：B
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Such problem （）air, water, and noise pollutions are becoming more and more serious in some big cities.
A.like
B.as
C.of
D.about
参考答案：B