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标题: 求解：GWD-8-Q9 、 [打印本页]

作者: aary431 时间: 2010-7-23 16:07
标题: 求解：GWD-8-Q9 、

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?

A.SV40 is widely used as a research tool in cancer laboratories.

B.Changes in the technique of manufacturing the vaccine now prevent contamination with SV40.

C.Recently discovered samples of the vaccine dating from 1960 still show traced of the virus.

D.In a small percentage of cases of mesothelioma, there is no history of exposure to asbestos.

E.In Finland, where the polio vaccine was never contaminated, samples from mesotheliomas do not contain SV40.
答案是E，但我不幸选了C，NN们啊、、

作者: Luxe 时间: 2010-7-23 16:41
逻辑链是 exposure to Asb 导致 Mes，SV40 有助于导致Mes，SV40是猴子身上的，1960 PV被SV40污染。
所以 PV是Mes上有SV40的根源。即就是污染的PV有SV40.
A，sv40广泛，无关
B，现在的PV 可以防SV-40无关
C，现在发现的1960年的PV样本里含有SV-40，说的是sv-40存活的持久。
D，讲的是Mes 和E to asb的关系，无关
E，没被污染的PV没有SV40
E选项对命题进行了加强。

作者: aary431 时间: 2010-7-23 17:50
谢谢诶、

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