单项选择题

Questions 22-25 are based on the following conversation. You now have 20 seconds to read the questions 22-25. What starts the conversation

A．An advertisement.
B．A sales clerk’s comment.
C．A druggist’s suggestion.
D．An article.

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单项选择题

单项选择题

Questions 22-25 are based on the following conversation. You now have 20 seconds to read the questions 22-25. What starts the conversation 您的浏览器不支持 audio 元素。