单项选择题

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
What are the students going to use a tape recorder for
A．To practice speaking slowly.
B．To record a voice from the television.
C．To play a speech by the professor.
D．To evaluate their own voices.
单项选择题
According to the professor, how can a speaker indicate that the topic is about to change
A．By pausing.
B．By raising pitch.
C．By lowering register.
D．By pointing to a chart.
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