第一章测试1.The challenges of urban water resources include ( ).
A:Urban water distribution renders large energy consumption. B:Capital and operational costs of water supply for long distance transportation are high. C:High risk of urban water pollution. D:The standards of urban water quality are high due to the increasing concerns about the safety of urban water sources.
答案:ABCD
2.It is relatively hard to separate salt from water, because ions such as Ca2+，Mg2+，K+ are tightly surrounded by water molecules.
A:错 B:对
答案:B
3.Lakes and reservoir waters usually have low water mobility, high turbidity, and relatively stable water quality. ( )
A:对 B:错
答案:B
4.Heavy metals can be concentrated in plant roots or aquatic animals, causing great danger to living organisms. ( )
A:对 B:错
答案:A
5.In the US, different sewage plants follow the same discharge standards. ( )
A:对 B:错
答案:B
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