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 this passage mainly talk about

A．How to establish a company.
B．How to strengthen a marketing program.
C．How to analyze product sales.
D．How to keep self-esteem.

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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 this passage mainly talk about 您的浏览器不支持 audio 元素。