单项选择题

Questions 23 to 25 are based on the conversation you have just heard.

A．What kind of medicine to develop.
B．When to advertise the drugs.
C．How to promote their products.
D．The regulations of medicine advertising.

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1.考试作弊屡禁不止 2. 考试作弊的原因 3. 解决办法

Questions 23 to 25 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。