题目

镁橄榄石可以表示为2MgO·SiO2，其酸根离子为   A．SiO44-                       B．Si2O64-                 C．SiO32-                 D．Si2O32- 答案：AI would appreciate ______ very much if you could change the plan a bit to make it more workable.A.thatB.thisC.itD.you