题目

以下物质间的每步转化通过一步反应就能实现的是（ ） A . Al﹣Al2O3﹣Al（OH）3﹣NaAlO2 B . S﹣SO3﹣H2SO4﹣MgSO4 C . Mg﹣MgCl2﹣Mg（OH）2﹣MgO D . Si﹣SiO2﹣H2SiO3﹣Na2 SiO3 答案：CPeople Who Moved China, hosted by CCTV, honours the people ______ the valuable contributions should be remembered by every Chinese． A．whose B．of whom C．that D．of which