有下列二叉树,对此二叉树中序遍历的结果为( )。A.ABCDEF B.BDAECF

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问题:

有下列二叉树,对此二叉树中序遍历的结果为( )。

A.ABCDEF

B.BDAECF

C.ABDCEF

D.ABCDFE

考点:计算机等级考试C语言二级C语言笔试352
题型:单项选择题

阅读理解。

     Do you play a musical instrument? If so, you may be getting smarter. A recent study shows that taking

music lessons can raise a person's IQ.

     Scientists studied 132 children in Canadian schools. At the beginning of the school year, these children

took an IQ test. Then they were divided into four groups. One group took singing lessons. Another group

took weekly piano lessons. The third group took classes in drams (戏剧). And the last group did no special

activities at all.

    At the end of the school year, the 132 children took an IQ test again. In all four groups, the average score

went up. However, the piano players'IQs went up 7.0 points on average. The average increase for the other

three groups was only 4.3 points.

     The researchers say that the difference is small and it may not result in better grades for the piano players.

However, they still consider the results important. Learning an instrument helps kids becomes better at

concentrating and at memorizing things. Therefore, the researchers say, it may be good for brain development

in young people.

    If you have a chance to learn to play a musical instrument, never miss it. Remember it can make you

smarter.

1. Which of the following is NOT true of the study?

A. It was done in Canada.

B. It was done by some musicians.

C. It included four groups of children.

D. It took one school year to complete.

2. Which of the following is true?

A. Average IQ scores increased in all the groups.

B. Only the piano players' IQs increased.

C. The average increase for all four groups was 4.3 points.

D. Most of the children's IQs did not go up.

3. The underlined word "they" in the passage refers to ______.

A. better grades

B. piano players

C. researchers

D. instruments

4. What's the main idea of the passage? 

A. It's good for us to listen to music.

B. Everyone should learn to play the piano.

C. Take an IQ test before you learn instruments.

D. Learning instruments may make kids smarter.

题型:单项选择题

教育与处罚相结合政策的基本要求为( )。

A.以教为主,寓教于罚

B.教育多数,处罚少数

C.当罚则罚,罚如其分

D.以罚为主,寓罚于教

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新古典模型认为,资本-劳动比率的改变是通过价格的调节进行的。

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乡土树种

题型:单项选择题

ATN协议中,会聚子层CS被定义成两个子层,即【 】和公共部分会聚子层(CPCS)。

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