单项选择题

In heavily populated agricultural areas, ______ when crops fail.

A．everybody takes to water sports
B．the people starve
C．a shortage of water will help
D．more energy will be used
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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
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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