单项选择题

A．At a bookstore.
B．At a laboratory.
C．At a library.
D．At a post office.
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单项选择题
A．Plants and herbs.B．Magic pills.C．Luck charms.D．All of the above.
A．Plants and herbs.
B．Magic pills.
C．Luck charms.
D．All of the above.
单项选择题
A．Client-lawyer.B．Student-teacher.C．Patient-doctor.D．Customer-salesman.
A．Client-lawyer.
B．Student-teacher.
C．Patient-doctor.
D．Customer-salesman.
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