问题 选择题

某学生忘记了自己的QQ号,但记得QQ号是由一个2,一个5,两个8组成的四位数,于是用这四个数随意排成一个四位数,输入电脑尝试,那么他找到自己的QQ号最多尝试次数为(  )

A.18

B.24

C.6

D.12

答案

根据题意,其QQ号由共4个数字组成,

将这4个数字全排列,有A44种情况,

而这4个数字中有2个8,则共可以组成

A44
A22
=
24
2
=12个四位数,

那么他找到自己的QQ号最多尝试12次,

故选D.

阅读理解

阅读理解。

      George Banks was a clever journalist. He worked for a good newspaper, and  he liked arguing

very  much. He argued with anybody, and about anything. Sometimes the people whom he argued

with were as clever as he was, but often they were not.

      He did not mind arguing with stupid people at all: he knew that he could never persuade them to

agree, because they could never really understand what he was saying, and the stupider they were,

the surer they were that they were right; but he often found that stupid people said very amusing things.

     At the end of one argument which George had with one of these less clever people, the man said

some-thing which George has always remembered and which has always amused him. It was, "Well,

Sir, you should never forget this: there are always three answers to every question: you answer, my

answer,and the  correct answer."

1. It seemed to George as if ________.

A. it was more interesting to argue with as clever people as he was

B. it was more interesting to argue with clever people than with stupid ones

C. it was more interesting to argue with stupid people than with clever ones

D. it was no good arguing with stupid people

2. From the passage we can conclude that________.

A. George did nothing but argue with others

B. George was a man full of sense of humour

C. George always won the arguments

D. What George said was difficult to understand

3. Why didn't George mind arguing with stupid people? Because ________

A. he wanted to win the arguments

B. he wanted to make the arguments more heated

C. stupid people could be easily fooled

D. what stupid people said could often give him greater pleasure

4. What one of the stupid people said at the end of one argument could be considered very________.

A. clever

B. stupid

C. strange

D. special

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