单项选择题

A．Because many people don’t know how to behave in social situations.
B．Because one may have been born that way.
C．Because most persons are shy.
D．Because it’s good to be shy.
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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
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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