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单选题

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 temperature.

参考答案C

解析: What important discovery about vibrations caused by earthquakes does the instructor mention?
【解题思路】四项均以they开头，并且可能与地球内部结构有关，重点要听清选项中的they指什么。
【解析】they指地震引发的振动，录音在提到vibrations之后便提到科学家的发现，即振动可以穿越地球内部数千英里，因此答案为c。

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A．When the Earth was formed.
B．The composition of the Earth's interior.
C．Why molten rock is hot.
D．How often a volcano is likely to erupt.

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单选题

A．How deep they are.
B．Where earthquakes form.
C．How hot they are.
D．What purpose they serve.

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单选题

A．Political values of a people.
B．People's religious beliefs.
C．Culture differences.
D．Politics, economics and war.

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