在教案中，完成教学任务的关键所在是(

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29181' and id < 2374194 and id<>'2374194' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29181' and id > 2374194 and id<>'2374194' order by id asc limit 5