函数f (x)为奇函数且f (3x+1)的周期为3，f (1)=－1，则f (2006)等于（ ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='16193' and id < 1361293 and id<>'1361293' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='16193' and id > 1361293 and id<>'1361293' order by id asc limit 5