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
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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