The landscape of the American West was dramatically altered during the 20th century as a result of the______construction of dams

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问题 The landscape of the American West was dramatically altered during the 20th century as a result of the______construction of dams along major rivers.

选项 A、degenerative
B、widespread
C、advancing
D、extensive

答案B

解析 四个选项的意思分别是:degenerative退步的,变质的,退化的;widespread分布广泛的,普遍的;advancing超前,提前,前进;extensive广大的,广阔的,广泛的。句意是,在20世纪,美国西部的风光因为沿主要河流建造广泛的大坝而变得面目全非。
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