幼儿身体各系统发育不平衡。下列系统中发育最早的是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31373' and id < 2516248 and id<>'2516248' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31373' and id > 2516248 and id<>'2516248' order by id asc limit 5