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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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.
D．What purpose they serv
单项选择题
What is the purpose of the talk
A．To review what students know about volcanic activity.
B．To demonstrate the use of a new measurement device.
C．To explain the answer to an examination question.
D．To provide background for the next reading assignment.
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