●Traversing a binary tree in preorder is equivalent to (68) .(68)
●Traversing a binary tree in preorder is equivalent to (68) ．
(68) A．Traversing the forest corresponding to the binary tree in root-first order
B．Traversing the forest corresponding to the binary tree in root-last order
C．Traversing the forest corresponding to the binary tree in breadth-first order
D．None of the above
正确答案：A【解析】前序遍历一个二叉树等价于按从树的根部、右子树、右子树查找顺序查找树。
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