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【单选题】
21 三体型先天愚型的最主要的病因 是:________
A.
母亲怀孕期间接触辐射
B.
母亲怀孕期间有病毒感染
C.
母亲年高 ,卵子减数分裂时,染色体 不分离
D.
父亲年高 ,精子减数分裂时,染色体 不分离
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