OG Verbal分册 41

jackxu006

Dental researchers recently discovered that toothbrushes 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 onlyafter 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 hotwater after each
use were as likely to have contaminated toothbrushes as were peoplewho 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.



我想问这里的Conclusion对应的是原文的什么内容呀？看OG的解释说对应的是bacteria that cause pneumonia and strep throat这部分了，但我觉得应该是 people should replace their toothbrushes at least once a month这一部分呀~能不能帮忙解释一下呀？谢谢！

杂色百合2012

答案选什么啊？