皮皮学，免费搜题
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【单选题】
叶酸是体内重要的维生素，孕妇体内水平过低最严重的潜在危害是（）
A.
妊娠高血压综合征
B.
生出低体重儿
C.
孕期严重缺钙
D.
胎儿神经管畸形
E.
伴有严重锌缺乏
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