单项选择题

what is the conversation mainly about

A．The effects of. caffeine.
B．Some causes of headaches.
C．How to do well on exams.
D．Problems with the student cafeteri
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单项选择题
what is the man's problem
A．He has a headache.
B．He failed his history exam.
C．He is tired.
D．He is too busy.
单项选择题
what does the woman probably think about coffee
A．It helps people work efficiently.
B．It's more refreshing than soda.
C．It should be drunk in moderation.
D．It has less flavor than te
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