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 percent.
D．Less than 3 per cent.

单项选择题

The phrase the world in the first line of the passage refers to

A．"man".
B．"you".
C．"woman".
D．"they".