在科学讨论型活动中，儿童知识准备来源于直接经验的是（ )

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27839' and id < 2287697 and id<>'2287697' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27839' and id > 2287697 and id<>'2287697' order by id asc limit 5