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题目材料：
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's to get, or afford, a variety of fresh foods.
Which of the following, if true, helps to support the conclusion presented above?
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A.over the years the number of cases of schizophrenia has not shown a correlation with degree of economic distress.
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B.most of the development of brain areas affected in schizophrenia occurs during the last month of the mother's pregnancy.
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C.suicide rates are significantly higher in winter than in any other season.
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D.the nutrients in fresh foods have the same effects on the development of the brain as do the nutrients in preserved foods.
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E.a sizable proportion of the patients involved in the study have a history of schizophrenia in the family.
B显示答案
