【OG24-691题】Rainwater contains hydrogen of a heavy form called deuterium. The deuterium content of wood reflects the deuterium content of rainwater available to trees during their growth. Wood from trees that grew between 16,000 and 24,000 years ago in North America contains significantly more deuterium than wood from trees growing today. But water trapped in several North American caves that formed during that same early period contains significantly less deuterium than rainwater in North America contains today.Which of the following, if true, most helps to reconcile the two findings?_mofa留学圈mofaGRE在线题库系统_GRE在线搜题_GRE题库解析_GRE真题机经_GRE课程_GRE培训机构

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Rainwater contains hydrogen of a heavy form called deuterium. The deuterium content of wood reflects the deuterium content of rainwater available to trees during their growth. Wood from trees that grew between 16,000 and 24,000 years ago in North America contains significantly more deuterium than wood from trees growing today. But water trapped in several North American caves that formed during that same early period contains significantly less deuterium than rainwater in North America contains today.

Which of the following, if true, most helps to reconcile the two findings?

There is little deuterium in the North American caves other than the deuterium in the water trapped there. Exposure to water after a tree has died does not change the deuterium content of the wood. Industrialization in North America over the past 1 0 0 years has altered the deuterium content of rain. Trees draw on shallow groundwater from rain that falls during their growth, whereas water trapped in caves may have fallen as rainwater thousands of years before the caves formed. Wood with a high deuterium content is no more likely to remain preserved for long periods than is wood with a low deuterium content,

正确答案： D

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题干翻译
树木生长期间可用雨水的氘含量：16000 24000年前北美生长树木的木材氘含量显著高于现今树木；但同一早期北美洞穴中封存水的氘含量显著低于现今北美雨水氘含量。 逻辑链
树氘含量高，洞水氘含量低 问题类型
解释矛盾（reconcile the two findings） 推理过程
需要找到一个原因，能合理说明为什么树木木材氘含量高，而同时期洞穴水氘含量低。 选项分析
A选项：北美洞穴中除了封存水的氘外氘很少。只说明了洞穴氘的分布情况，未解释为何与树木氘含量差异大，无关，排除。 B选项：树木死后接触水不改变木材氘含量。讨论的是死后情况，与生长期间树木和洞穴水氘含量差异无关，排除。 C选项：过去100年北美工业化改变雨水氘含量。说的是近代工业化影响，与题干所讨论的早期树木和洞穴水氘含量差异无关，排除。 D选项：树木利用生长期间降雨形成的浅层地下水，而洞穴中封存的水可能是洞穴形成数千年前的雨水。很好地解释了树木和洞穴水氘含量差异的原因，当选。 E选项：高氘含量木材和低氘含量木材长期保存可能性无差异。说的是保存可能性，与氘含量差异无关，排除。

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