单项选择题

What is the main topic of the conversation

A．How to select a good umbrella.
B．How to treat minor aches and pains.
C．How to predict the weather.
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单项选择题
A．A librarian.B．A professor.C．A researcher.
A．A librarian.
B．A professor.
C．A researcher.
单项选择题
A．At a hospital.B．At a restaurant.C．At a library.
A．At a hospital.
B．At a restaurant.
C．At a library.
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