儿童在某个时期最容易学习某种知识或技能，过了这个时期，发展的障碍就难以弥补。这一时 期称为（ )

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27406' and id < 2266108 and id<>'2266108' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27406' and id > 2266108 and id<>'2266108' order by id asc limit 5