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szxissean · 发表于 2013-7-7 08:45:39

Although exposure toasbestos 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 States60 percent of tissue samples from mesotheliomas, but none from healthy tissue,contain SV40. SV40 is a monkey virus; however, in 1960 some polio vaccine wascontaminated with the virus. Researchers hypothesize that this vaccine was thesource of the virus found in mesotheliomas decades later.

Which of thefollowing, if true, most strongly supports the researchers’ hypothesis?

A. SV40is widely used as a research tool in cancer laboratories.

B. Changesin the technique of manufacturing the vaccine now prevent contamination withSV40.

C. Recentlydiscovered samples of the vaccine dating from 1960 still show traced of thevirus.

D. Ina small percentage of cases of mesothelioma, there is no history of exposure toasbestos.

E. InFinland,where the polio vaccine was never contaminated, samples from mesotheliomas donot contain SV40

答案是e,我选的b,帮忙比较分析下

苏木苏木 · 发表于 2013-7-7 18:31:51

纯跟lz探讨探讨。。。
我认为结论是1960那批的vaccine是SV40的来源，然后B简单点来说就是现在生产的vaccine没有SV40，那现在的vaccine有没有病毒跟1960的vaccine木有任何关系也影响不了结论。。

olivia瓜瓜 · 发表于 2013-7-7 22:07:58

Which of thefollowing, if true, most strongly supports the researchers’ hypothesis?
A. SV40is widely used as a research tool in cancer laboratories.无关
B. Changes in the technique of manufacturing the vaccine now prevent contamination withSV40控制技术的变化，使如今的vaccine没有包含sv40/ 这个是无法证明vaccine was the source of the virus。

C. Recently discovered samples of the vaccine dating from 1960 still show traced of the virus.不能证明它是其源头

D. In a small percentage of cases of mesothelioma, there is no history of exposure toasbestos.无关

E. InFinland,where the polio vaccine was never contaminated, samples from mesotheliomas donot contain SV40 没有vaccine的mesotheliomas 不含有SV40，那么含有的vaccine就有SV40。

fairypp · 发表于 2013-7-7 22:59:16

B
"the argument states explicitly that "in 1960 some polio vaccine was contaminated with the virus"; there can be no debate about this fact.

the hypothesis in this argument is that this sv40 -- the sv40 that got into the polio vaccine in 1960 -- is the same sv40 that was found in the cancers later on.
since we are only concerned with whether the 1960 polio vaccine spread the virus, later changes in the procedure for manufacturing the vaccine are irrelevant."

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