2017新GRE写作官方题库Argument全题解析汇总(67)

>>GRE写作：2017新GRE写作官方题库Argument全题解析汇总(67)

>>GRE考试辅导：精品课程高端指导

GRE官方题库原题67

Three years ago, because of flooding at the Western Palean Wildlife Preserve, 100 lions and 100 western gazelles were moved to the East Palean Preserve, an area that is home to most of the same species that are found in the western preserve, though in larger numbers, and to the eastern gazelle, a close relative of the western gazelle. The only difference in climate is that the eastern preserve typically has slightly less rainfall. Unfortunately, after three years in the eastern preserve, the imported western gazelle population has been virtually eliminated. Since the slight reduction in rainfall cannot be the cause of the virtual elimination of western gazelle, their disappearance must have been caused by the larger number of predators in the eastern preserve.

Write a response in which you discuss what specific evidence is needed to evaluate the argument and explain how the evidence would weaken or strengthen the argument.

题目翻译

3年前，由于西部野生动物保护区的洪水，100只狮子和100只西部羚羊被转移到了东部保护区，这里也是很多与西部物种相同但数量更大的动物的家园，同时也是西部羚羊的近亲东部羚羊的家。气候上唯一的区别就是东部雨量略少一些。不幸的是，3年后，东部保护区的外来西部羚羊几乎绝迹。因为雨量的微小差异不可能是导致西部羚羊灭绝的原因，其灭绝原因一定是因为东部保护区内更大数量的的食肉动物。

题目分析

1. 西部羚羊数量减少不代表它们被灭绝了。它们可能是和东部的羚羊进行了杂交或者适应环境变化从而表现出了东部羚羊的特征。所以这些羚羊可能是成功地进行了转变并融入了东部羚羊群体中，并没有被灭绝。

2. 即使这些西部羚羊确实灭绝了，也可能是气候原因造成的。也许是羚羊不适应更少的降雨，从而在饮水上受到了一些生存压力，导致了羚羊的灭绝。

3. 即使羚羊不是因为气候原因而灭绝，也没有排除除捕食者以外其他导致灭绝的因素。比如西部羚羊可能是由于不适应地理环境灭绝或是在与其它食草动物竞争生存资源失败后灭绝。在排除这些理由以前，需要更多证据来证明羚羊的灭绝与捕食者之间存在必然关系。

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