下列不属于教师上课前的“三备”内容的是( )

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26612' and id < 2216506 and id<>'2216506' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26612' and id > 2216506 and id<>'2216506' order by id asc limit 5