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
Allen is buying the tickets________.
A．because she gets a student discount
B．because Bob doesn’’t have very much money
C．because she lost a bet and owes Bob money
D．because Bob left his wallet at home
单项选择题
What measure has been taken to help Gypsy children
A．Special schools have been set up for them.
B．Permanent homes have been built for them.
C．They are now taught in their own language.
D．They are now allowed to attend local schools.
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