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.
单项选择题
A．A diet largely consisting of fruits and vegetables.B．A diet including grains, fresh fruit and vegetables, and meat.C．A diet including a combination of several different food types.D．A diet without fat and oils.
A．A diet largely consisting of fruits and vegetables.
B．A diet including grains, fresh fruit and vegetables, and meat.
C．A diet including a combination of several different food types.
D．A diet without fat and oils.
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