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患儿，女，10个月，因面色苍白2个月来医院就诊。患儿生后单纯母乳喂养，未添加辅食。查体：精神萎靡，营养发育较差，反应迟钝，皮肤黏膜和甲床苍白，头发枯黄，前囟2cm×3cm，心、肺无异常，肝肋下2cm，脾肋下1.5cm。血红蛋白70g/L，血涂片见红细胞体积小、含色素低。应采取的措施是（）
A . A.输血治疗
B . 口服铁剂
C . 口服叶酸
D . 口服维生素C
E . 肌注维生素B
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