By (i)______many aspects of natural river ecosystems, some dams cause serious ha

游客2024-01-10  22

问题 By (i)______many aspects of natural river ecosystems, some dams cause serious harm, producing (ii)______effects on water, land, wildlife, and even the atmosphere.

选项

答案 B,F

解析 逗号说明前后同义重复。第二空与harm(伤害)同义重复。negligible可忽略的,salutary有利的,deleterious有害的。答案选F。obliterate除去,alter变更,ameliorate改善。代入选项,答案选B。
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