儿童开始用简单完整句进行表达的年龄是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31370' and id < 2516004 and id<>'2516004' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31370' and id > 2516004 and id<>'2516004' order by id asc limit 5