以下是引用tania在2005-7-6 22:51:00的发言:携隐jj,想与你讨论一下og逻辑29题: 29. 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.
B. Bottled spring water has not been consumed in significantly different quantities by people diagnosed as having the intestinal disease, as compared to people who did not contract the disease.
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. C
E. The water in the rural county was brought up to the sanitary standards of the water in neighboring counties ten years ago. og解释Since A supports the view that sanitary conditions have been improving, it tends to support the officials’ explanation. 答案是C,我觉得没问题,但仔细一想,觉得A也可以是正确答案啊。按照lawyer的分类,这道题属于weaken中的因果型,weaken结论的话有以下方法:其他原因;割断因果等等。我觉得A属于割断因果。今年患病的人比去年减少了是因为水处理工厂的条件改善了,A选项提出,因为许多新的水处理工厂在过去的五年间就已经建好了,说明并不是今年水处理工厂的条件改善导致今年患病的人减少了,所以水处理工厂条件的改善与患病人员减少没关系,从而削弱此结论。 og 的解释就更看不懂了! 
题目说的是水处理的条件变好了,那么过去5年间建立了很多水处理工厂不就是水处理变好的一个表现吗?所以OG解释说A符合原文,是对原文的一种加强。顺便说一下,如果题目说A导致B,问加强的话,说A确实存在,也是加强的一种方式。 |