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单选题 英语六级
2017-06-06

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

A

答案解析

What did P and S waves help scientists discover about the layers of the earth?
【解题思路】三项出现了they，要重点关注该词的指代对象。
【解析】题目问地震横波和纵波对科学家的帮助。短文中提到英国的地质学家通过它们发现了地球地幔(mantle)和液相(liquid core)以及地幔和地壳的范围，即地层的深度，因此答案为A。

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