2017新GRE写作官方题库Argument全题解析汇总(64)
>>GRE写作:2017新GRE写作官方题库Argument全题解析汇总(64)
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GRE官方题库原题64
The following is a letter to the editor of an environmental magazine.
"In 1975 a wildlife census found that there were seven species of amphibians in Xanadu National Park, with abundant numbers of each species. However, in 2002 only four species of amphibians were observed in the park, and the numbers of each species were drastically reduced. There has been a substantial decline in the numbers of amphibians worldwide, and global pollution of water and air is clearly implicated. The decline of amphibians in Xanadu National Park, however, almost certainly has a different cause: in 1975, trout—which are known to eat amphibian eggs—were introduced into the park."
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
1975年X国家公园野生动物调查显示其有7中两栖动物,每种的数量都很丰富。然而到了2002年在公园中只观察到4种两栖动物,并且每种动物的数量都显著下降。同时全球两栖动物数量也在持续的下降,有可能是由于全球空气和水质的污染。但X公园的下降是由另外一种原因导致的:1975年的在公园水域引入鲑鱼的行为(鲑鱼捕食两栖动物的卵)。
题目分析
1. SURVEY不能说明两栖动物在自然条件下逐渐减少。首先,可能有很多动物躲起来而没有被发现,这会对统计结果产生影响;其次,即使的确数量减少,也可能是人为因素导致,比如管理员们正在将公园内的两栖动物搬迁到另一个公园。
2. 即使两栖动物的数量确实在减少,也未必是那些鲑鱼造成的。因为时间相关性不代表因果相关性,所以可能是其他原因,比如其他天敌的引入或是气候的变化所造成的。
3. 两栖动物在全球范围内的数量减少未必是由于空气和水的污染所致,可能是由其他原因造成的,比如栖息地被破坏,或者是天敌数量的成倍增长。
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