单项选择题

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
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单项选择题
Rivers have been important to man ______.
A．since the last century
B．for a very long time
C．since a few hundred years ago
D．since a few years ago
单项选择题
Rivers bring ______.
A．people and crops
B．life and wealth
C．poverty and death
D．agriculture and bridge
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