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单选题英语六级

2016-12-04

________________

A．To explain how the Grand Canyon was formed.

B．To demonstrate how difficult the dating technique is.

C．To disprove a theory about the age of Earth's first mountain ranges.

D．To give another example of how the dating technique might be useful.

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参考答案

答案解析

【预测】选项均为动词不定式短语，结合其中的explain．demonstrate，disprove a theory和give another example可知，本题可能考查讲座中谈及某事的作用。
【解析】D。教授最后指出铀一铅测定技术会有很多激动人心的发展可能，之后就提到该技术可以用来证实大陆板块分裂的一些理论由此可知，教授在此提及大陆板块分裂是为了举例说明铀一铅测定技术相当有用，故答案为D。

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