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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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
单项选择题
Key time is a period when ______.
A．visitors come to the plants
B．all workers must be at work
C．employers go round in the workshops
D．rush hours are over
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