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下面是关于药物华素片（西地碘片）使用说明书中的部分内容． 华素片（西地碘片）说明书[药品名称]通用名：西地碘片商品名：华素片[药物组成]本品主要活性成分是分子碘，含量1.5mg/片．将碘利用分子分散技术制成分子态西地碘，辅料为蔗糖等． （1）根据上述说明和所学化学知识回答： ①华素片中含有的活性成分是______（写分子式）． ②华素片的贮藏方法______． （2）某学生为验证华素片中确实含有上述活性成分，完成实验如下，请填写： ①取一粒药片放入研钵中研碎，再将药粉装入试管并加入约2mL蒸馏水；向该试管中再加入约2mL______（填选项字母），并用力振荡； A．酒精 B．NaOH溶液 C．四氯化碳 D．盐酸 ②描述加入该液体后观察到的现象______； ③选用该液体做实验的原因是______． （3）请再设计另一种方法，验证华素片中的活性成分（简述实验操作、现象和结论）．______．
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