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150. 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. Two studies of amphibians in Yosemite National Park 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 because it does not explain the worldwide decline."
这里的错误太多了，完全混乱的思维。 我找到了很多错误，但是感觉衔接过程缺乏逻辑。
1. 没有证据表明是环境污染影响了Y地区的两栖动物数量。另外，鲑鱼方面的因素也没有讲。
2. 即使两栖动物下降，可能是其他原因。
3. 即使是Y地区确实是由于环境污染造成的，但是不能代表全球的情况。而且也没有指出是环境下降影响了全球的两栖动物的数量。
怎么感觉这么混乱，而且1和3里，有重复之嫌.还是这道题目不适合让步式推理？
欢迎各位批评指正和讨论:)
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发表于 2010-8-10 17:41:18
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