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".
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单项选择题
According to the passage, sea-water can be turned into fresh water by
A．heating it up.
B．treating it with chemicals.
C．taking salt out of it.
D．drying it up.
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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