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gre改革后新版gre写作新题库里的作文方面的一个重要变化是有了指导语。而指导语的作用是有助于我们的逻辑性写作，以下是新版gre写作新题库内有关argument83的写作部分： 题目： 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, troutwhich are known to eat amphibian eggswere 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. 中文翻译： 1975年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202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公园的下降有几乎确定是另外一种原因导致的：1975年的在公园水域引入鲑鱼的行为。 | 
