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【单选题】
患儿,女,1岁,母乳喂养,未加辅食,近1个月来患儿出现皮肤、面色,表情呆滞,反应迟钝,少哭不笑。入院后检查发现肝脾轻度肿大,血红蛋白70g/L,叶酸正常,维生素B12降低。该患儿的贫血程度为A.
轻度
B.
中度
C.
重度
D.
极重度
E.
极危重度
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