皮亚杰认为认知的本质是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='23627' and id < 2055785 and id<>'2055785' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='23627' and id > 2055785 and id<>'2055785' order by id asc limit 5