Rivers have been important to man ______. [br] Energy is obtained from rivers by

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问题 Rivers have been important to man ______. [br] Energy is obtained from rivers by ______.

选项 A、building bridges across them
B、building dams across them
C、driving generators into them
D、channelling them into homes and factories

答案 B

解析本题问的是用何种方式才能从河水中得到能量?从第四段第二句"人们建立巨大的水坝，控制河水，灌溉庄稼，并且获得发动发电机的能量"可以找到答案。

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