英语六级

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进入在线模考
 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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