难易程度：★★★★
题目题材：环境
gre argument 150题目：
The following is a letter to the editor of an environmental magazine.
"The decline in the numbers of amphibians worldwide clearly indicates the global pollution of water and air(1,4,5). Two studies of amphibians in Yosemite National Park(2) in California confirm my conclusion. In 1915 there were seven species of amphibians in the park, and there were abundant numbers of each species. However, in 1992 there were only four species of amphibians observed in the park, and the numbers of each species were drastically reduced. The decline in Yosemite has been blamed on the introduction of trout into the park's waters, which began in 1920 (trout are known to eat amphibian eggs). But the introduction of trout cannot be the real reason for the Yosemite decline(3) because it does not explain the worldwide decline."
提纲：
(1)The author does not provide information concerning the level of pollution at different regions, thus the assumption that pollution is responsible for the decline in the numbers of amphibians everywhere is unwarranted.
(2)A specific case in Yosemite National Park could hardly be representative of the situation throughout the world.
(3)The argument fails to rule out the introduction of trout as a cause for the decline in the numbers of amphibians despite it could not explain the worldwide trend.
(4)The author provides no direct evidence to show that it is the pollution that resulted in the decline in the number of amphibians.
(5)The author ignores factors other than the pollution and the introduction of trout which could explain the decline in amphibian numbers in Yosemite.
注：题目中括号里的数字表明这句话体现的是提纲中第几号缺陷。
无论是gre issue还是gre argument，考生都应该养成写提纲的习惯。这种提纲式的gre写作练习可以帮助考生锻炼写作的逻辑性，而gre写作高分最重要的得分依据就是作文的逻辑性要强。希望大家都能写出好作文。
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