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Original usage refers to rivers that ______ . That rivers are used as open sewers for city wastes causes ______ and eutrophicat
Original usage refers to rivers that ______ . That rivers are used as open sewers for city wastes causes ______ and eutrophicat
admin
2009-08-19
26
问题
Original usage refers to rivers that ______ .
That rivers are used as open sewers for city wastes causes ______ and eutrophication.
选项
答案
the direct degradation of water quality
解析
该句中的In effect, rivers are used as open sewers for municipal wastes, which results not only in the direct degradation of water quality but also in eutrophication. 明确指出了把河流当作开放的下水道会引起的问题,答案可直接得出。
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大学英语六级
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