单项选择题

In ancient times empires and civilizations grew up near ______.

A．nature
B．dams
C．rivers
D．buildings
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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
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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