GWD1-Q9 哪位好心人快快来帮我 急！！！！！

ljyjulia

GWD1-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 traces 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：E
文中说：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.
楼主对这句话是怎么理解得？ in 1960 some polio vaccine was contaminated with the virus是说这种polio vaccine← 被污染了SV40，那么polio vaccine是受的一方，怎么能说polio vaccine是→SV40（这种发现在mesotheliomas的病毒的）来源呢？（这里的the virus found in mesotheliomas decades later是说的是SV40吧？）



或者这句话是不是可以这样理解， “however”这里的转折是说在1960年发现virus的另一处“携带者”“polio vaccine ”（小儿麻痹牛痘疫苗），然后作者就假定这种virus就是来自这种小儿麻痹牛痘疫苗~~~~

另：截止SV40 is a monkey virus 这句之前是不是就是说了这样的一个事实：mesotheliomas主要是由SV40导致    ？

芷萱85

1。（这里的the virus found in mesotheliomas decades later是说的是SV40吧？） 是的，本文就提到了这么一种病毒
2。mesotheliomas主要是由SV40导致    ？ 不是的，是由暴露 asbestos 是主要原因，感染SV40是次要原因