练习成绩并非可以直线式地上升，有时会出现暂时停顿的现象，这种现象就叫高原现象。( )

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30615' and id < 2469456 and id<>'2469456' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30615' and id > 2469456 and id<>'2469456' order by id asc limit 5