第四章测试1.The value of biological oxygen demand is lower than chemical oxygen demand.（ ）
A:对 B:错
答案:A
2.Domestic and industrial sources for water pollution are good examples of point sources.（ ）
A:错 B:对 3.Groundwater is in subsoil, which is below the water table.（ ）
A:对 B:错 4.livestock breeding sources are nonpoints sources. They are difficult to control.（ ）
A:对 B:错 5. The use of cooling water may cause thermal pollution in water. （ ）
A:错 B:对
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