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  3. a child can be taken as mentally retarded if he or she. Which is NOT a possible cause of mental retardation?

a child can be taken as mentally retarded if he or she. Which is NOT a possible cause of mental retardation?

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问题 a child can be taken as mentally retarded if he or she.
Which is NOT a possible cause of mental retardation?
选项 A、Alcohol or drug abuse.
B、Abnormal genes from the parents.
C、a well-planned pregnancy.
D、Problems during childbirth.
答案C
解析 其它的三个因素在短文的第六段和第八段都分别被提到。
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