单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions.
Now listen to tire conversation.
Why does the man have a headache

A．Because of the over-production of prostaglandin.
B．Because he has no aspirin.
C．Because he is tired.
D．Because of the Biology course.

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单项选择题

单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to tire conversation. Why does the man have a headache 您的浏览器不支持 audio 元素。