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.
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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.
单项选择题
What did P and S waves help scientists discover about the layers of the earth
A．How deep they are.
B．Where earthquakes form.
C．How hot they are.
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