题目内容

It was Friday evening. Mr and Mrs. White _____ ready to fly to L.A..

A. are getting
B. get
C. were getting
D. got

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冬至的英文是

A. Winter Solostice
B. Lesser Fullness
C. Xiaoman
D. Spring water

Xi'an has a long history of more than _____ years.

A. 1,000
B. 2,000
C. 3,000
D. 5,000

Winter Solostice was _____ to be created.

A. the last
B. the second
C. the very first
D. the third

对二叉树的结点从1开始进行连续编号,要求每个结点的编号大于其左、右孩子的编号,同一结点的左右孩子中,其左孩子的编号小于其右孩子的编号,可采用( )遍历实现编号。

A. 先序
B. 中序
C. 后序
D. 按层次