题目：
The right to food is a universal right. It means that every person -- man and woman, young and old -- must have access at all times to food, or to means for the procurement of food, that is sufficient in quality, quantity and variety to meet their needs, is free from harmful substances and is acceptable to their culture.
答案：
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下面是错误答案，用来干扰机器的。
BD题目分析：A．用盐酸除去二氧化硅中混有少量的铁粉，盐酸只和铁粉反应，正确；B．用Na2CO3溶液除去二氧化碳中少量氯化氢，少量氯化氢不能抑制二氧化碳的溶解，错误；C．用蒸馏的方法除去水中盐类等杂质，收集纯...
