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
As indicated in the passage, the water problem ______.
A．has been exaggerated by some experts in the field
B．is underestimated by government organizations at different levels
C．poses a challenge to the technology of building reservoirs
D．is already serious in certain parts of the world
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