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标题: 想不明白的逻辑题 [打印本页]

作者: zhzhq888 时间: 2009-5-2 01:19
标题: 想不明白的逻辑题
The number of people diagnosed as having a certain intestinal disease has dropped significantly in a rural county this year , as compared to last year , health officials attribute this decrease entirely to improved sanitary conditions at watertreatment plants, which made for cleaner water this year and thus reduced the incidence of the disease.
Which of the following, if true, would most seriously weaken the health officials' explanation for the lower incidence of the disease?
答案是C：Because of a new diagnostic technique , many people who until this year would have been diagnosed as having the intestinal disease are now correctly diagnosed as suffering from intestinal ulcers.
按照我的理解，现象是：许多被诊断为有某种肠道病的人大量减少，结论是：归因于水处理厂卫生条件的改善。
我认为weaken它的方法一共有两种：1.还有其他结论可以解释这个现象 2.这个现象是有偏差的。
答案是：以前被诊断为肠道病的人现在还是诊断出有肠道病。我怎么觉得对结论没什么影响啊？

作者: 没办法1987 时间: 2009-5-2 15:52

答案的意思是因为新的诊断技术原来一直被认为是intestinal disease 的，现在被认为是intestinal ulcers。

你可能把答案理解错了，两种病不一样的。

weaken是要weaken结论，结论说是improved sanitary conditions 导致The number dropped significantly

选项说：诊断错误导致The number dropped significantly

就是你说的第一种weaken方法啊。

作者: zhzhq888 时间: 2009-5-3 00:39
晕。。。明白了。。。原来这两个不一样的哦。。。真感谢！

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