单项选择题

Where did the conversation most probably take place

A．In a library.
B．In a classroom.
C．In a bookstore.
D．In a hotel.
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单项选择题
What is the speaker’s main topic
A．Training for a professional athlete.
B．His physical training.
C．How to do cross-country running.
D．How to do mountain climbing.
单项选择题
The animal source which provides the most protein for human being is ______.
A．beef
B．fish
C．pork
D．chicken
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