单项选择题

According to the passage, we can avoid a worldwide water shortage in the future by

A．increasing rainfall.
B．reusing water and utilizing sea-water.
C．cutting down our consumption of water.
D．reducing the number of factories producing steel.
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单项选择题
What percentage of the earth's water can man actually use at present
A．Nearly 75 per cent.
B．About 97 per cent.
C．Exactly 3 per cent.
D．Less than 3 per cent.
单项选择题
Which of the following statements, according to the passage, is NOT true
A．A limited water supply will affect industrial production.
B．Every large city purifies and reuses its water.
C．Purified water is not exactly as fresh as spring water.
D．Oceans are the largest water source.
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