单项选择题

A．They have nothing to do with each other.
B．They have something to do with each other.
C．They help each other in a way.
D．They depend on each other.
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单项选择题
A．The effects of caffeine.B．Some causes of headaches.C．How to do well on exams.D．Problems with the student cafeteria.
A．The effects of caffeine.
B．Some causes of headaches.
C．How to do well on exams.
D．Problems with the student cafeteria.
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