单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. According to the professor, what can a speaker do to keep an audience’s attention

A．Speak very loudly.
B．Ask questions frequently.
C．Vary tone, volume, and speed of speech.
D．Limit the speech to fifteen minutes.

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单项选择题

单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. According to the professor, what can a speaker do to keep an audience’s attention 您的浏览器不支持 audio 元素。