向BaCl2溶液中通入SO2至饱和，此过程无明显实验现象．再向溶液中加入一种物质，溶液变浑浊．加入的这种物质不可能是（　　）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19692' and id < 1705451 and id<>'1705451' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19692' and id > 1705451 and id<>'1705451' order by id asc limit 5