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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热门试题

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

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