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. What does the speaker say is the important precondition for advertising

A．An educated population.
B．A large supply of goods and services.
C．A large number of publications.
D．An industrialized society.

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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. What does the speaker say is the important precondition for advertising 您的浏览器不支持 audio 元素。