OG-29题

jdxf

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.

A为什么不对？？A的含义是不是说，过去的5年内建设了很多PLANTS
这样难道不能WEAKEN吗？因为如果HEALTH OFFICIAL 说的对，过去5年都应该有显著下降才是

kathy72

A 是无关选项, 题目的结论是肠疾病的减少是因为水干净了. 与水的质量有关, 与水的数量无关. 而A选项只强调了数量, 对结论不影响.

C是他因削弱.

jdxf

怎么无关呢？
water-treatment plants让水更干净了
过去5年建设了很多water-treatment plants，那过去5年水就应该干净了啊
不应该等到今年才有效果。所以是削弱

kathy72

对不起, 题目看错了.

A 应该是支持才对. 过去5年建了很多水处理厂, 正好说明了5年来水越来越干净了. 正好支持了结论.

今年比去年得肠疾病的人下降了, 并没有否认5年来一直下降的趋势啊.

cranberry

A如果理解成支持，似乎也解释不了为什么今年下降的明显，因为题目要说明的不是一个趋势的问题，而是今年比去年显著的下降。

rose1100xu

本题应该是反对前提。说前提错。所以削弱

流沙

种植plant不是前提吧？只是一种可能的原因，削弱它是可以的。

而且OG中并没有不能削弱前提的说法。

这道题的最佳答案是对比出来的。

eSpirit

我的理解是：与去年相比，今年患病的人数大大下降了。官员们说这是由于水处理厂卫生状况的提高。题目要求削弱，可以有两方面来入手；1，可以说去年与今年水处理厂的卫生状况其实并没有改变，是一样的；或者2，患病人数的减少并不是由于卫生好了（他因法）。

A只是说在五年内建成了好多的新的水处理厂，这并不能起到削弱作用。

而C说由于有了新的检测设备，本来用老机器检测出来是患intestinal disease的病人，现在用新机器测出来结果他们并不是真正患了intestinal disease，而是得了intestinal ulcer，这样一来本该算在intestinal disease里头的人数就少了，从而解释了所谓患intestinal disease病的人数减少的真正原因。

bigp

以下是引用jdxf在2003-10-10 15:21:00的发言：
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.

A为什么不对？？A的含义是不是说，过去的5年内建设了很多PLANTS
这样难道不能WEAKEN吗？因为如果HEALTH OFFICIAL 说的对，过去5年都应该有显著下降才是

正确答案是C，我没有异议，只是对OG的解释不太感冒：

A选项应该是起不到support的作用呀：文中的关键是official认为是improved sanitary conditions at water-treatment plants在做怪，应该是和water-treatment plants的数量没有任何关系的。

happythree

Is intestinal ulcer not a kind of intestinal disease?