OG10-29 没有问过的题目，谢谢！！！

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.

E. The water in the rural county was brought up to the sanitary standards of the water in neighboring counties ten years ago.

B also tends to support the officials’ explanation, because it eliminates a factor that might have differentiated between those contracting and those not contracting the disease and thus rules out an alternative explanation.

答案是C，我是想问一下OG对B的解释，我看得有点云里雾里的。

B说有病的和没病的消耗的瓶装春泉差不多，这个消除了这两类人的差别。但是这个为什么rule out an alternative explanation啊？到底什么东东啊？

谢谢！谢谢！

我对OG B 中的解释是说, 这个选项, 说到一个(无关)的解释, 所以排除. 因为, 文中没有提到瓶装水和疾病的关系.

这个题，我同意LZ对B的解释，B就是一个排除它因，是个strengthen，但我觉得C答案有问题吧，

原题目是说因为水好了，所以肠病感染的人少了，要weaken的话，一般比如就该说是什么其他原因导致感染人少啦，或者说第二年水也好，但感染的却很多啦什么的。

这个C答案是说因为发明了新的诊断技术，那些本该被诊断出来的人都被诊断出来了，那么这不是意味着感染的人增多了么？？？虽然排除法只能选这个，但是我怎么觉得这个答案就是不太通顺呢

这是我思路错了还是什么，大家讨论一下