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  3. The most compelling evidence of the risks of carcinogenic effects of environmental pollutants comes from animal data, suc

The most compelling evidence of the risks of carcinogenic effects of environmental pollutants comes from animal data, suc

admin2011-01-17  65
问题            The most compelling evidence of the risks of carcinogenic effects of
       environmental pollutants comes from animal data, such as the reproductive
       failure and anomalous development witnessed in birds and fish exposed to DDT.
Line    But can human health effects of a compound be judged without a consensus of
(5)      independent epidemiological studies and experimental findings on humans
       subjects? One would argue not, even though increases in breast cancer have
       recently been correlated to exposure to environmental pollutants. Scientists
       reviewing worldwide morbidities of certain hormonally responsive organs have
       found that while the incidence of breast cancer has been increasing, that of
(10)     cancer of the uterus, another hormonally responsive organ, has been
       decreasing. There is thus no evident increase in uterine cancer that would
       support the claim that a pollutant is causally responsible for the recent increase
       in breast cancer. It has been suggested that the increase may be the result of
       increased diagnosis, and geographical differences in cancer susceptibility are so
(15)     large that the currently available statistics do not permit a definite conclusion.
The author mentions all of the following as factors which limit the persuasiveness of the evidence suggesting a link between environmental pollutants and cancer EXCEPT
选项 A、The lack of study of the effects of pollutants on human health
B、Increased diagnosis rates
C、An increase in the worldwide breast cancer rate
D、A decrease in the worldwide uterine cancer rate
E、Geographical differences in cancer susceptibility
答案C
解析
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