单项选择题

Electrical power is produced by ______.

A．dams
B．reservoirs
C．factories
D．generators
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单项选择题
The things brought down by rivers from the mountains that are useful for cultivation are ______.
A．deltas
B．crops
C．fresh water life
D．soil and minerals
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
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