单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

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．He doesn’t hear the woman’s words clearly.B．He doesn’t agree with the woman.C．He isn’t sure about the weather.D．He thinks it’s a very hot day.
A．He doesn’t hear the woman’s words clearly.
B．He doesn’t agree with the woman.
C．He isn’t sure about the weather.
D．He thinks it’s a very hot day.
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