单项选择题

According to the weather report, the pollution index was________.

A．very good
B．good
C．fair
D．poor
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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.
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
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