单项选择题

According to the woman, what causes most of the damage to the air

A．Industrial sources.
B．Automobiles.
C．Nitrogen sources.
D．Natural activities.
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单项选择题
Parcels must be left open mainly for
A．customs’’ check.
B．security check.
C．convenience’’s sake.
D．the company’’s sake.
单项选择题
Parents who abuse their children tend to have the following problems EXCEPT ______.
A．religious problems.
B．emotional problems.
C．financial problems.
D．marriage problems.
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