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单选题
The most serious kind of pollution is _____.
A
noise pollution
B
air pollution
C
water pollution
D
A, B and C
参考答案
参考解析
解析：
由第二段中“Air pollution is the most serious kind of pollution.”可知，空气污染是最严重的污染。
由第二段中“Air pollution is the most serious kind of pollution.”可知，空气污染是最严重的污染。
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