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
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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
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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