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
In heavily populated agricultural areas, ______ when crops fail.
A．everybody takes to water sports
B．the people starve
C．a shortage of water will help
D．more energy will be used
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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