随着任务难度的增加，最佳动机水平是怎么变化的？（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30752' and id < 2476116 and id<>'2476116' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30752' and id > 2476116 and id<>'2476116' order by id asc limit 5