记忆效果最好，精力耗费上最经济的学习程度为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32216' and id < 2567071 and id<>'2567071' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32216' and id > 2567071 and id<>'2567071' order by id asc limit 5