在日常生活中出现了“加碘食盐”、“增铁酱油”、“高钙牛奶”、

在日常生活中出现了“加碘食盐”、“增铁酱油”、“高钙牛奶”、“富硒茶叶”、“含氟牙膏”等名词，这里的碘、铁、钙、硒、氟应理解为

　A．单质　　　　　B．元素　　　　C．分子　　　　　D．氧化物

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