单项选择题

A．In a laboratory.
B．In a drugstore.
C．In a supermarket.
D．In the dining hall.
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单项选择题
A．Exploring the web.B．Using the library.C．Searching the bookstore.D．Not given.
A．Exploring the web.
B．Using the library.
C．Searching the bookstore.
D．Not given.
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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