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 years ago
D．since a few hundred years ago
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单项选择题
A heavily populated agricultural area is one where ______.
A．there are more factories than farms
B．only a few farmers live
C．too many farmers live close to one another
D．people suffer and starve
单项选择题
Energy is obtained from rivers by ______.
A．building bridges across them
B．building dams across them
C．driving generators into them
D．channelling them into homes and factories
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