有20位同学，编号从1至20，现在从中抽取4人作问卷调查，用系统抽样方法确定所抽的编号为(   )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='22426' and id < 1968948 and id<>'1968948' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='22426' and id > 1968948 and id<>'1968948' order by id asc limit 5