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
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
单项选择题
One of the main advantages of Flextime for workers is that they ______.
A．have a greater sense of duty
B．can avoid busy traffic
C．can get higher pay
D．can avoid working hard
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