单项选择题

Who is hurt by air pollution

A．The buyer.
B．The seller.
C．Both the buyer and the seller.
D．None.
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单项选择题
Who is the speaker
A．Professor Watkins.
B．The field trip leader.
C．The driver of the bus.
D．Professor Watkins ’ s brother.
单项选择题
How much does the final account for
A．20%
B．30%
C．50%
D．100%
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