Air pollution refers to the presence of all the following EXCEPT______.A.harmful solidsB.h
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Air pollution refers to the presence of all the following EXCEPT______.
A.harmful solids
B.harmful gases
C.harmful liquids
D.harmful chemicals
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正确答案:D
解析:根据短文里的界定:空气污染就是:Air pollution is the presence in the atmosphere of harmful gases, liquids,or solids.
