某二叉树的前序序列为ABCDEFG,中序序列为DCBAEFG,则该二叉树的深度（根结点在第1层）为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28853' and id < 2351160 and id<>'2351160' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28853' and id > 2351160 and id<>'2351160' order by id asc limit 5