单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. According to the speaker, what was the first advertisement

A．Samples of products.
B．Signs on shops.
C．Pictures of products painted on walls.
D．Free paper pamphlets.

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单项选择题

单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. According to the speaker, what was the first advertisement 您的浏览器不支持 audio 元素。