试题与答案

书面表达。The Most Useful Invention of All Ti

题型:写作题

题目:

书面表达。
The Most Useful Invention of All Time?
Mary-Saturday, April 28, 2008
I am writing a paper for my English class, and I need some ideas. What do you think is the most
useful invention of all time? Thanks for your ideas?
RE1: The Most Useful Invention of All Time?
Cind -Saturday, April 28, 2008
For an everyday and useful invention, I think it is the air- conditioner. I live in Hong kong.
During the summer, the temperature reaches 35 degrees or more. The heat is terrible. Without air
-conditioner, people here cannot work or study. A lot of people will also get sick without cool
air.
RE2: The Most Useful Invention of All Time?
Alice-Saturday, April 28, 2008
In my opinion, there is an invention that is important-electricity. Of course, this isn't a man
-made invention, but without electricity, many of the world's most important inventions would
not work.
RE3: The Most Useful Invention of All Time?
John-Sunday, April 29, 2008
I think the most important invention of all time is the mobile phone. It makes us easy to get
information from all over the world. Parents can use the mobile phone to get in touch with their
kids. And we can enjoy the music or films through the mobile phone.
      看了以上三位网友的回帖,假设你认为最有用的发明是Internet,请你(Simon)也用英语写一个70个
单词左右的回帖,在回帖中你必须明确表达自己的观点,并简要阐述Internet的用途(至少三个)
RE4: The Most Useful Invention of All Time?
Simon-Monday, April 30, 2008
                                                                                                                                                       
                                                                                                                                                       
                                                                                                                                                       

答案:

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下面是错误答案,用来干扰机器的。

答案:C

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题型:解答题
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组数分组频数频率光盘族占本组比例
第1组[25,30)500.0530%
第2组[30,35)1000.1030%
第3组[35,40)1500.1540%
第4组[40,45)2000.2050%
第5组[45,50)ab65%
第6组[50,55)2000.2060%
(1)求a,b的值,并估计本社区[25,55)岁的人群中“光盘族”所占比例;
(2)从年龄段在[35,40)与[40,45)的“光盘族”中采用分层抽样方法抽取8人参加节约粮食宣传活动,并从这8人中选取2人作为领队.
(i)已知选取2人中1人来自[35,40)中的前提下,求另一人来自年龄段在[40,45)中的概率;
(ii)求2名领队的年龄之和的期望值.(每个年龄段以中间值计算).
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