题目内容：
为了防止食品变质，常在食品袋中放入小袋的铁粉，这是利用铁的（ ）
A还原性
B氧化性
C酸性
D碱性
答案解析：
单选题：为了防止食品变质，常在食品袋中放入小袋的铁粉，这是利用铁的（ ） A还原性B氧化性C酸性D碱性
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酸具有共同的性质，是因为（）。A都能电离出氢离子B都能使石蕊试液变红C都能跟碱反应生成盐和水D都含有氧元素
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