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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单项选择题

What important discovery about seismic waves does the instructor mention

A．They occur at regular intervals.
B．They can withstand great heat.
C．They travel through the Earth's interior.
D．They can record the Earth's internal temperatur

单项选择题

What does the man want the woman to do

A．Meet his anthropology teacher.
B．Lend him her magazine when she's clone with it.
C．Come over to his house after class.
D．Help him study for an anthropology test.