40. Dental researchers recently discovered that tooth-brushes can become contaminated with bacteria 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 bacteria 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。
(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 bacteria being present．
正确答案是C，想问一下这道题目的D选项答案说是加强，为什么啊？谢谢。
(D) The dental researchers found that people who rinsed their toothbrushes thoroughly in hot water after each use were as likely to have uncontaminated toothbrushes as were people who only rinsed their toothbrushes hurriedly in cold water after each use
牙齿研究人员发现，在每次使用后，不管是用热水进行充分清洗还是用冷水匆忙冲刷一下，牙刷都是会一样被沾染
那只好换了，所以不是削弱
92
没有核对这题是不是留在ＯＧ１１当中．ＯＧ１０当中８０％的ＣＲ题留在ＯＧ１１当中，去掉了那些逻辑不太严密的．
给定的前提不能变，有封闭办公室的可以在里面吸烟
结论不能变
Ａ与给定的前提和结论无关
Ｂ改变结论了
Ｃ也变结论了
Ｄ在与给定的前提和这个假设可以得出结论
Ｅ与与给定的前提和结论无关
这题的前题是强调所有吸烟雇员的拥有平等吸烟权利．，才会有Therefore,secretaries who smoke should be offered enclosed offices.
如果要强调吸烟雇员和非吸烟雇员的平等All secretaries should be offered enclosed offices.甚至是All employees should be offered enclosed offices
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