Which is NOT a possible cause of mental retardation?
A.Alcohol or drug abus B.Abnormal genes from the parent C.A well-•planned pregnanc D.Problems during childbirt
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根据下列材料请回答题:Mental Retardation(智力迟钝).Mental retardation is a
根据下列材料请回答题:Mental Retardation(智力迟钝).Mental retardation is a condition in which p