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算法用来描述运算的实现步骤，它是精确定义的一组规则。衡量算法的优劣一般有两个方法，即时间复杂度和【3】复杂度。

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教师资格的认定机构

W: Hi, David. I haven’t seen you for ages. How are you getting along with your workM: Hi, Susan. Not so well as to be expected. I’ve left my position. I can’t bear the rudeness of my boss any longer.W: What are you going to do thenM: No idea. Anyway, I’ve got to think about it seriously. And youW: I’ve been very successful as a dancer. I like this kind of life. It is so exciting.M: You can’t do that forever.W: No. But I’ve decided to open a dance school once I’ve moved to the top. A lot of young dancers need better training.M: That’s a wonderful idea. How is the woman getting on with her work().

A. She hasn’t reached the top yet.
B. She isn’t very successful.
C. She doesn’t like her present position.

在面向对象模型中常用的有两种继承，即单继承与【18】。

Now about the news. An early morning fire damaged the historic Gallad House today. It destroyed the third floor of the building but fire fighters saved the first and second floors. There were only a few elderly people living in the building at the time and they were carried out to safety. The Galled House was built in 1718 and was used as a hotel for over 150 years. George Washington stayed here in 1782. The Galled family owned the building until the 1930s. Then they sold it to the Muss family. Five years ago it was made into a building for the elderly. Several fire departments were called to the scene. When we asked Fire Chief Andrew Bond how the fire started, he answered that it was most likely a burning cigarette caused it. Chief Bond promised to further examine into the cause. Where did the fire probably start().

A. On the first floor．
B. On the second floor．
C. On the third floor.