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Although exposure to asbestos is the primary cause of mesothelioma, a slow-developing cancer, researchers believe that infection by the SV40 virus is a contributing cause, since in the United States 60 percent of tissue samples from mesotheliomas, but none from healthy tissue, contain SV40. SV40 is a monkey virus; however, in 1960 some polio vaccine was contaminated with the virus. Researchers hypothesize that this vaccine was the source of the virus found in mesotheliomas decades later.
Which of the following, if true, most strongly supports the researchers’ hypothesis?
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
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尽管暴露在asbestos 是M病的首要原因，研究者相信SV40感染也是很大原因，因为美国60%M组织样本包含SV40，健康组织没有含SV40的。SV40是猴子病毒；然而1960年某种polio 疫苗被此病毒感染，研究者假设此疫苗是多年后M病里病毒来源。
增强题 必须要含有polio疫苗的关键因素
(A) SV40 广泛用于实验室；无关，排
(B) 疫苗技术改变阻止了来自SV40的感染；无关，排
(C) 1960年的疫苗样本刚被发现，仍显示病毒痕迹；无法验证和M病的联系，排
(D) 有很少比例M病例没有暴露在asbestos过；特殊病例，跳出范畴，排
(E) 芬兰，polio疫苗没被感染，M病的样本里不含SV40；取非选项，无更佳选项，正确。
497114wbost
Researchers hypothesize that this vaccine was the source of the virus found in mesotheliomas decades later 疫苗是m病中有病毒的原因 取逆否命题：m病中没有病毒的话，那么一定不能有这种被污染过的疫苗，E选项正确。
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2022-07-26 17:29:26
Josiechen302
若一个现象只有A和非A，一个结果只有B和非B， 那么若需要论证A导致B，则只要能论证非A导致非B即可
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2022-06-19 17:32:12
302848w
没懂，如果1960年疫苗污染的比例高于60%，那得M的人里60%发现有SV40不是很正常吗？
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2020-02-28 12:07:22
AUCHUI
题干：vaccine(virus)-mesotheliomas(virus) E选项：vaccine-mesotheliomas
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2018-10-02 18:22:20
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