单项选择题
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A．Exploring the web.
B．Using the library.
C．Searching the bookstore.
D．Not given.
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单项选择题
A．Doctor and patient.B．Professor and student.C．Receptionist and guest.D．Boss and worker.
A．Doctor and patient.
B．Professor and student.
C．Receptionist and guest.
D．Boss and worker.
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