第33题: [单项选择]已知一棵二叉树前序遍历和中序遍历分别为 ABDEGCFH 和 DBGEACHF,则该二叉树的后序遍历为 ( )。 A. GEDHFBCA B. DGEBHFCA C. ABCDEFGH D. ACBFEDHG 参考答案:B 答案解析:利用前序和中序遍历的方法可以确定二叉树的结构,具体步骤如 下:①前序遍历的第一个结点A为树的根结点;②中序遍历中A的左边的结点为A的左子树,A右边的结点为A的右子树;③再分别对A的左右子树进行上述两步
第34题: [单项选择]Why isn’t the man going to work A. The boss wants him to have a rest. B. He wants to go for a picnic. C. He is sick and has to stay home. 参考答案:B 答案解析:[听力原文] F:Aren’t you going to work today M:I called my boss and told him I was sick. Actually,