[語文] PP2-Q24 [CR]
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)，小弟怎麼看都想不通，又要勞煩大大們相助了:)
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