83 The following is a letter to the editor of anenvironmental magazine.
"In 1975 a wildlife census found that there wereseven species of amphibians in Xanadu National Park, with abundant numbers ofeach species. However, in 2002 only four species of amphibians were observed inthe park, and the numbers of each species were drastically reduced. There hasbeen a substantial decline in the numbers of amphibians worldwide, and globalpollution of water and air is clearly implicated. The decline of amphibians inXanadu National Park, however, almost certainly has a different cause: in 1975,trout—which are known to eat amphibian eggs—were introduced into thepark."
Write a response in which you discuss whatspecific evidence is needed to evaluate the argument and explain how theevidence would weaken or strengthen the argument.
提纲: 1调查结果合理。考虑了特殊情况。有的种类迁移出了栖息地。 2全球物种的灭绝不是由于别的原因。例如全球变暖。 3这里物种的灭绝不是由于别的原因。例如污染。
特别是第二点很奇怪,感觉它和作者的观点无关,完全是文章自己的一个漏洞,不过满分5.5里面写出来了。求各位大神指导下
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