单项选择题

A．Doctor and patient.
B．Professor and student.
C．Receptionist and guest.
D．Boss and worker.
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单项选择题
A．A popular TV program.B．A breakthrough in technology.C．A decent purchase.D．A new electronics store.
A．A popular TV program.
B．A breakthrough in technology.
C．A decent purchase.
D．A new electronics store.
单项选择题
In the United States influenza is one of the ten principle causes of death.
A．Y
B．N
C．NG
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