2. 外语
  3. Rivers have been important to man ______. Energy is obtained from rivers by ______.

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

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问题 Rivers have been important to man ______.
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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