A:向稀硝酸中加入铁粉
B:向稀盐酸中滴入少量的NaAlO2溶液
C:向NaOH溶液中通入CO2气体
D:向MgSO4、H2SO4的混合溶液中加入过量的Ba(OH) 2溶液
— Nora published her first poem when she was only seven!
— At seven? What a ! I knew few words at her age.