[討論]GWD-10-9

[peitoujosh]

GWD-10-9
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.


原本的答案是E，後來經有JJ討論號答案改成C，不過我覺得答案還是原本的E，理由如下:

１。C說最近發現的１９６０疫苗仍然保有病毒，這個語意不夠完整，因此我可以weaken給你看，1960的疫苗會被污染其實是前一陣子實驗室發生意外所造成，並不是１９６０年時就被污染的，我的意思是不能忽略了原題有SOME(深紅色)，也就是說大部分的疫苗有可能是在２００３年被污染，然後２００４年的時候檢查出有所有的疫苗都被汙染，但是這不能代表這些被污染的疫苗是１９６０年M病發生的主因，因為疫苗是２００３年才被污染的

２。E有問題我知道，可是沒辦法不選它，E的玩法是逆命題的型態，兩邊加no而已，有到美加上過課的人應該知道我在講捨麼。

[micht]

這題有貼過..

http://www.formosamba.com/phpBB3/viewtopic.php?t=1051