单项选择题

Which of the following can best served as the title of the passage

A．The Cause of Air Pollution.
B．The Issue of Air Pollution.
C．The Types of Air Pollution.
D．The Prevention of Air Pollution.

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单项选择题

What is the first thing that people ought to do in face of pollution, according to the author

A．To see the sky outside in the morning.
B．To walk outside to see the colored sun.
C．To take care of, and prevent air pollution now.
D．To analyse the different layers of air pollution.

单项选择题

Air pollution refers to the presence of all the following EXCEPT______.

A．harmful solids
B．harmful gases
C．harmful liquids
D．harmful chemicals

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