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 commercials are less expensive.C．Advertising in newspapers alone is not sufficient.D．TV commercials attract more investments.
A．Their competitors have long been advertising on TV.
B．TV commercials are less expensive.
C．Advertising in newspapers alone is not sufficient.
D．TV commercials attract more investments.
单项选择题
A．Go through a health check.B．Take little luggage with them.C．Arrive early for boarding.D．Undergo security cheeks.
A．Go through a health check.
B．Take little luggage with them.
C．Arrive early for boarding.
D．Undergo security cheeks.
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