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
No matter where it is used, Flextime system has proved ______.
A．entirely effective
B．a complete failure
C．to be disliked by the employers
D．too difficult to carry out
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