单项选择题

A．In the restaurant.
B．At the railway station.
C．In the post office.
D．At the airport.
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单项选择题
What is the author’’s purpose in writing this article
A．To justify the study of the Boston University Medical Center.
B．To stress the importance of maintaining proper weight.
C．To support the statement made by York Onnen.
D．To show the most effective way to lose weight.
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