第七章测试1.Which is the secondary Pollutant?（ ）
A:SO2
B:CO
C:HNO3
D:NO
答案:C
2.Particulate matter and Ozone are primary pollutants. （ ）
A:对 B:错 3.Acid rain is mainly caused by SO2 and NO2.（ ）
A:错 B:对 4.Chlorofluorocarbon (CFC) is one kind of greenhouse gas. Also, CFC can damage ozone layer.（ ）
A:错 B:对 5.Photochemical smog is a mixture of primary pollutants and secondary pollutants.（ ）
A:错 B:对
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