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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.
单项选择题
A．Go through a health cheek.B．Take little luggage with them.C．Arrive early for boarding.D．Undergo security checks.
A．Go through a health cheek.
B．Take little luggage with them.
C．Arrive early for boarding.
D．Undergo security checks.
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