OG-93 请教nn们，a b e选项是否无关呢？

konson

93. Dental researchers recently discovered that tooth-brushes can become contaminated with bacterial that cause pneumonia and strep throat. They found that contamination usually occurs after toothbrushes have been used for four weeks. For that reason, people should replace their toothbrushes at least once a month.

Which of the following, if true, would most weaken the conclusion above?

(A) The dental researchers could not discover why toothbrush contamination usually occurred only after toothbrushes had been used for four weeks.

(B) The dental researchers failed to investigate contamination of toothbrushes by viruses, yeasts, and other pathogenic microorganisms.

(C) The dental researchers found that among people who used toothbrushes contaminated with bacterial that cause pneumonia and strep throat, the incidence of these diseases was no higher than among people who used uncontaminated toothbrushes.

(D) The dental researchers found that people who rinsed their toothbrushes thoroughly in hot water after each use were as likely to have contaminated toothbrushes as were people who only rinsed their toothbrushes hurriedly in cold water after each use. C

(E) The dental researchers found that, after six weeks of use, greater length of use of a toothbrush did not correlate with a higher number of bacterial being present.

OG解释：

Since the recommendation is based on the discovery that bacterial contamination occurs after about four weeks,

the researchers’ inability to discover why contamination takes that long to appear does not weaken the recommendation (choice A),

nor does their failure to investigate other forms of contamination (choice B),

nor does the discovery that contamination does not worsen after six weeks (choice E).

答案选c理解但是不明白abe选项应该是有关但无法削弱，或是根本就是无关的呢？

[此贴子已经被作者于2006-5-10 12:40:31编辑过]

konson

把我对题目的理解也贴出来：

after four weeks ->contamination occurs

contaminated with bacterial ->pneumonia and strep throat

结论： replace their toothbrushes at least once a month.

选项C为有因无果的削弱，选项D加强。

[此贴子已经被作者于2006-5-3 14:01:11编辑过]

konson

顶一顶！

feiqtx

个人感觉，A很明显的无关。但是BE呢？请教NN，

maggiecookies

  我觉得ABE都有关, 但是没有起到直接削弱的作用.我觉得C说得特别顺眼和有道理.

A,B,  我觉得有点象EVALUATION, 但C 是EVALUATION 的结果.E有削弱, 但没有C 明显和直接.

    我只是参与讨论,水平不高, 还请大家指教.

yaoyao99

A. The reason for contamination is irrelavant to the fact that toothbrushes do get contaminated.
B. Other contaminations has nothing to do with the recommendation to replace tootbrushes due to bacterial contamination. Again irrelavant information.
D. The uneffective method that people use to try to prevent contamination is irrelavant to the recommendation.
E. The severity of contamination after a longer period of time, namely 6 weeks, doesn't change the fact that toothbrushes are still contaminated after 4 weeks.  It doesn't help/weaken the recommendation.

konson

谢谢楼上几位的参与！

我现在的理解是：文章说因为牙刷用了四个星期后感染细菌，所以要每个月换一次。

A:为什么四星期后会感染（反正感染了），B:其他致病源（感染细菌就够了），E:六周以后会不会恶化（说的是四个星期），

都与推理过程无关。请各位指教啊！

cccccc0

up

lukewang1983

A 医学研究者没有发现为什么细菌感染只发生在使用牙刷四个礼拜以后. (干脆就不起任何作用)
B 医学研究者没有去研究病毒啊XXXXX什么的。。。（也没有起到作用）
C 医学研究者研究表明用 toothbrushes contaminated with bacterial that cause pneumonia and strep throat的人发病可能性并不比用uncontaminated toothbrushes的人高。（言下之意也就是不管你用什么样的 toothbrushes都没有关系,致病的原因不是 toothbrushes）
D 热水刷牙和冷水刷牙的人一样
E 用了牙刷6个礼拜以后，时间再长也无所谓了？？？？ greater length of use of a toothbrush did not correlate with a higher number of bacterial being present

我自己晕了，难道是选C???

lukewang1983

忘了说一下了,D选项冷水热水跟题目无关的吧。。没有产生任何作用， E选项说理个礼拜以后，对4个礼拜时候产生的结论没有任何影响。要是说3个礼拜时候这样，那么可能就是削弱了。