根据耶克斯一多德森定律，学生 解决困难和复杂的任务时.最有利的动机水平是( )

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26046' and id < 2188072 and id<>'2188072' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26046' and id > 2188072 and id<>'2188072' order by id asc limit 5