【单选题】【消耗次数：1】
肉类中的铁主要存在形式是?
①
贮备铁
②
细胞色素氧化酶
③
血红蛋白
④
铁蛋白
⑤
肌红蛋白
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体内贮存铁缺乏，使血红蛋白合成减少，导致红细胞生成障碍所引起的一种小细胞、低色素性贫血称为（）
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