SO 2通入滴有酚酞的NaOH溶液中，发现红色消失。主要原因是（  ）   

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19697' and id < 1705940 and id<>'1705940' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19697' and id > 1705940 and id<>'1705940' order by id asc limit 5