单项选择题

According to the author, the water price should ______.

A．correspond to its real value
B．be reduced to the minimum
C．stimulate domestic demand
D．take into account the occurrences of droughts
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单项选择题
In order to raise the efficiency of the water supply, measures should be taken to ______.
A．centralize the management of water resources
B．increase the sense of responsibility of agencies at all levels
C．guarantee full protection of the environment
D．encourage local and regional control of water resources
单项选择题
The author says that in some hot and dry areas it is advisable to ______.
A．build big lakes to store water
B．construct big pumping stations
C．channel water from nearby rivers to cropland
D．build small and cheap irrigation systems
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