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
What is the real cause of the potential water crisis
A．The world population is increasing faster and faster.
B．Half of the world's water resources have been seriously polluted.
C．Humanity has not placed sufficient value on water resources.
D．Only half of the world's water can be use
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 worl
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