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.
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单项选择题
A．Through food.B．Through air.C．Through insects.D．Though body fluids.
A．Through food.
B．Through air.
C．Through insects.
D．Though body fluids.
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