[求助]og11 cr 20题

rpch2004

20. 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 10 years ago.

C       Correct. This statement properly identifies a factor that weakens the officials' argument.

 本题通过寻找它因（新技术）来进行削弱，这个切入点没问题。但是选项的表述好象有误，选项说到这一年为止本应该诊断为有病的人被正确诊断为有病，也就是说通过新技术，有病的人增多了，而题干的表述是这一年intestinal disease has dropped significantly？？？？谢谢

rolar

题干说的是intestinal disease ，而选项说的是intestinal ulcers，两者是否不同呢？

rpch2004

意思应该一样，问题不在这里

batmanhm

是说原本应该被诊断为肠疾病的人现在被诊断为肠溃疡,那就说明了肠疾病的数量减少是另有他因.