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GRE阅读逻辑题训练(25)

2017-03-28 16:10:00来源:新东方在线整理

  为了帮助大家练习GRE阅读逻辑题,新东方在线GRE频道为大家带来GRE阅读逻辑题训练(25)一文,希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

  Prolonged and unseasonable frosts produce frost rings in deciduous trees, which grow in moderate climates. Frost rings do not appear in any of the fossilized deciduous trees than have been found in Antarctica. Hence, it is unlikely that such frosts occurred in Antarctica at the time the fossilized trees lived.

  Which of the following is an assumption on which the argument depends?

  A:There are fossilized nondeciduous trees from Antarctica that bear frost rings.

  B:Deciduous trees are more likely to bear frost rings than are other tree varieties.

  C:The process of fossilization does not completely obscure frost rings in deciduous trees.

  D:Present-day deciduous trees are more sensitive to changes in temperature than were the deciduous trees of ancient Antarctica.

  E:Prolonged and unseasonable frosts that might have occurred in Antarctica when the now fossilized trees were still living did not always produce frost rings in deciduous trees.

  最佳解析:

  本题推理为“因为霜环并不发生在化石化的落叶树中,所以那时的南极没有霜冻”。本题由发现南极的化石化的落叶树中没有霜环这个事实得到结论:南极没有霜冻。结论对事实作出了说明,解释了化石化的落叶树没有霜环的原因。而假设应为:没有其它原因说明为什么南极化石化的落叶树没有霜环。(C)说明了这一点:化石化的进程不会使落叶树中的霜环完全模糊。因为如果化石化进程使霜环完全模糊的话,也能够解释为什么没有霜环。所以必须否决这一可能才能使上面的推理成立。(C)is correct。(A)(B)(D)显然与上述推理无关。读者仔细体会(E)的作用,其作用与例9中(E)选项作用相同,为什么呢?起什么作用?

  答案:C

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