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
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
According to Flextime system workers need not ______. A) work by the same timetable B ) work all the weekdays C) go to work at weekends D) go to work in the early morning
According to "Flextime" system workers need not ______. A) work by the same timetable B ) work all the weekdays C) go to work at weekends D) go to work in the early morning
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