单项选择题

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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.
填空题
It is suggested to provide opportunities for employees to express their ideas about ______.
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