【单选题】【消耗次数：1】
任何一棵二叉树的叶结点在先序、中序和后序遍历序列中的相对次序（ ）。
①
A．不发生改变
②
B．发生改变
③
C．不能确定
④
D．以上都不对
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设有一棵二叉树，其先序遍历序列是：ABCDEFG，中序遍历序列是：CBAEDFG，则该二叉树的后序遍历序列是（ ）。
①
CBDFGEA
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CBDGFEA
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CBEFGDA
④
CBEGFDA
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一棵非空的二叉树的先序遍历序列与后序遍历序列正好相反，则该二叉树一定满足（）。
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所有的结点均无左孩子
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所有的结点均无右孩子
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只有一个叶子结点
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have not written
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③
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④
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