单项选择题

A．Teacher and student.
B．Doctor and patient.
C．Manager and office worker.
D．Travel agent and customer.
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单项选择题
A．Their competitors have long been advertising on TV.B．TV commerciais are less expensive.C．Advertising in newspapers alone is not sufficient.D．TV commerciais attract more investments.
A．Their competitors have long been advertising on TV.
B．TV commerciais are less expensive.
C．Advertising in newspapers alone is not sufficient.
D．TV commerciais attract more investments.
单项选择题
A．Air traffic conditions.B．Traffic jams on highways.C．Road conditions.D．New traffic rules.
A．Air traffic conditions.
B．Traffic jams on highways.
C．Road conditions.
D．New traffic rules.
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