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

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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