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自由的疑惑一：A选项，OG说是对原文解释的支持，可是自由个人觉得是削弱啊，因为A中有” in the last five years”
自由的疑惑问题二：D选项，我个人感觉是对原文解释原因的削弱，因为有它因的存在，自由的思路和OG的解释产生了冲突。
自由的疑惑问题三：C选项，OG认为是正确选项，可是，C中的”the intestinal disease” 同” the intestinal ulcers” 感觉是一样的啊！都是肠器官疾病的一种啊！为什么C把它看做是两个不同的事物呢？谢谢大家。
题目如下：
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 water-treatment 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?
A) many new water-treatment plants have been built in the last five years in the rural county.
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.
D) Because of medical advances this year, far fewer people who contract the intestinal disease will develop severe cases of the disease.
Since A supports the view that sanitary conditions have been improving, it tends to support the officials’ explanation. The reduction of the severity of the diagnosed cases( choice D) does not bear on the officials’ explanation. The health officials’ explanation assumes that the decrease in the number of people diagnosed with the disease accurately reflects a diminution in cases of the disease. By pointing out that this assumption is false, C undermines the officals’ explanation and thus is the best answer.
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