单项选择题

A heavily populated agricultural area is one where ______.

A．there are more factories than farms
B．only a few farmers live
C．too many farmers live close to one another
D．people suffer and starve
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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
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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