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  3. Proportionally, more persons diagnosed as having the brain disorder schizophrenia were born in the winter months than at any oth

Proportionally, more persons diagnosed as having the brain disorder schizophrenia were born in the winter months than at any oth

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问题 Proportionally, more persons diagnosed as having the brain disorder schizophrenia were born in the winter months than at any other time of year. A recent study suggests that the cause may have been the nutrient-poor diets of some expectant mothers during the coldest months of the year, when it was hardest for people to get, or afford, a variety of fresh foods. Which of the following, if true, helps to support the conclusion presented above?
选项 A、Over the years the number of cases of schizophrenia has not shown a correlation with degree of economic distress.
B、Most of the development of brain areas affected in schizophrenia occurs during the last month of the mother’s pregnancy.
C、Suicide rates are significantly higher in winter than in any other season.
D、The nutrients in fresh foods have the same effects on the development of the brain as do the nutrients in preserved foods.
E、A sizable proportion of the patients involved in the study have a history of schizophrenia in the family.
答案B
解析 本题是由一个事实“大脑精神分裂症患者出生于冬季的人比其他时间的人多”，而提出一个解释性的原因“冬李营养不良是原因”。(B)选项指出大部分精神分裂症的脑部区位(记为B)是在母亲怀孕期最后一个月长成的(记作A)，把A与B连了起来，所以(B)起到了支持作用，说明确实是因为冬天营养不良的饮食；(A)中的“economic distress”；(C)中的“suicide rates”均与上面推理无关；(D)与(E)都从某种程度上起到了反对作用，说明未必是营养不良的饮食的原因。
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