( )是指为完成特定的教学任务，教师和学生按一定要求组合起来进行活动的结构。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26044' and id < 2184508 and id<>'2184508' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26044' and id > 2184508 and id<>'2184508' order by id asc limit 5