二叉树的前序周游和中序周游如下：前序周游：EFHIGJK中序周游：HFIEJKG该二
题型：单项选择题
问题：
二叉树的前序周游和中序周游如下：
前序周游：EFHIGJK
中序周游：HFIEJKG
该二又树根中右子树的根是（）。
A. E
B. F
C. G
D.H
题型：单项选择题
阅读理解
When you are reading something in English, you may often meet with a new word. What's the best
way to know it?
You may look it up in the English-Chinese dictionary. It will tell you a lot about the word: the
pronunciation, the Chinese meaning and how to use the word. But how can you know where the word is
thousands of English words? How to find it in the dictionary both quickly and correctly?
First, all the English words are arranged (安排) in the letter order. In the dictionary you can first see
the words beginning with letter A, then B, C, D…. That means, if there are two words "desert" and "pull", "desert" will be certainly before "pull". Then if there are two words both beginning with the same letter, you may look at the second letter. Then the third, the fourth…
1. This passage is about _____.
A. new words in writing
B. different dictionaries
C. the best way of reading
D. using an English-Chinese dictionary
2. In the dictionary you may not find _____.
A. how to pronounce the word
B. the spelling of the word
C. who used the word first
D. how to use the word
3. In an English-Chinese dictionary, the last word _____.
A. begins with Z
B. begins with A
C. is a short one
D. is not often used
4. Which group of words is in the right order in an English-Chinese dictionary?
A. perhaps, produce, plenty
B. straight, subject, surprise
C. century, center, business
D. foreign, entrance, headache
5. In the passage the writer tries to tell us that _____.
A. we have to use a dictionary when we read something in English
B. an English-Chinese dictionary can tell us everything about a word
C. an English-Chinese dictionary can help us a lot in our English study
D. all English-Chinese dictionary are the same