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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
admin
2011-01-17
42
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.
In concluding from the lack of increase in the incidence of uterine cancer that environmental pollutants may not play a significant role in the increase of the incidence of breast cancer, the author makes which of the following assumptions?
选项
A、Geographical differences between the rates of susceptibility to uterine cancer and susceptibility to breast cancer are negligible.
B、The human uterus is affected by the same set of environmental pollutants as the human breast.
C、Independent epidemiological studies are generally compatible with the experimental findings performed on humans.
D、It is generally easier to diagnose breast cancer than it is to diagnose uterine cancer.
E、Animal data similarly reflects that breast cancer rates are rising in animals while uterine cancer rates are falling.
答案
B
解析
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