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Energy is obtained from rivers by______.

A、building bridges across them

B、driving generators into them

C、building dams across them

D、directing them into homes and factories

时间：2021-07-20 04:38 关键词：

答案解析

B
54．答案为B  此题为细节题。从文章中的第四段第二句Man constructs...and get the energy needed to drive generators可以得知河水通过推动发电机运转获得电力能源。