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
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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