单项选择题

A．Seldom use a nickname.
B．Tell online friends the name of your school.
C．Always be careful about meeting online acquaintances.
D．Give out some of your personal information.
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单项选择题
A．Teacher and student.B．Doctor and patient.C．Manager and office worker.D．Travel agent and customer.
A．Teacher and student.
B．Doctor and patient.
C．Manager and office worker.
D．Travel agent and customer.
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