新版gre写作新题库：argument84.

　　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argument84的写作部分：

　　题目：

　　The following is a letter to the editor of an environmental magazine.

　　"Two studies of amphibians in Xanadu National Park confirm a significant decline in the numbers of amphibians. In 1975 there were seven species of amphibians in the park, and there were 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. One proposed explanation is that the decline was caused by the introduction of trout into the park&aposs waters, which began in 1975. (Trout are known to eat amphibian eggs.)"

　　Write a response in which you discuss one or more alternative explanations that could rival the proposed explanation and explain how your explanation(s) can plausibly account for the facts presented in the argument.

　　中文翻译：

　　在X国家公园对于两栖动物所进行的两次研究证实了全球两栖动物数量的下降。1975年公园中有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。一种解释就是两栖动物数量的下降曾被归因于始于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)。

　　写一篇回应，在其中讨论一个或数个可以和文中的解释相竞争的他种解释(原因)，并说明你提出的解释是如何可信的解释和说明文中呈现的事实的。

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