I in this school for three years. A. have studied B. will study C. am studying D. studied 答案: A 下列各组离子,在指定环境中一定能大量共存的是( )A、能使pH的试纸变深蓝色的溶液中:S2-、SO32-、Na+、SO42-B、加入铝粉能放出氢气的溶液中:CO32-、I-、NH4+、NO3-C、pH=7的溶液中:Al3+、K+、SO42-、HCO3-D、由水电离出的c(OH-)=1×10-13mol/L的溶液中:Fe2+、NH4+、ClO-、Cl-