若f(x)是R上周期为5的奇函数，且满 足f(1)＝1，f(2)＝2，则f(8)－f(4)＝(    ) 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='16193' and id < 1361283 and id<>'1361283' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='16193' and id > 1361283 and id<>'1361283' order by id asc limit 5