题目列表(包括答案和解析)
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Three Shanghai high school students may have recently overturned （推翻）a scientific theory found in many books.After four months of work they say the well?known Mpemba effect（姆潘巴现象）does not exist.?
Scientists are now checking to see if their discovery is real.The Mpemba effect says that hot water freezes faster than cold water.?
Ye Shasha is a Senior 3 student at Shanghai Xiangming Middle School.She first learned about the Mpemba effect from the book，100 000 Scientific Facts when she was in primary school.“I found it hard to understand but never doubted it.But our experiments show this phenomenon can never happen，”Ye said.?
Last year，an article about the Mpemba effect took first prize in a Shanghai science competition.But Huang Zengxin，a 57－year－old physics teacher in the school，found that the author made some mistakes while reasoning that hot water only freezes faster than cold water under certain conditions.?
Last November，he discussed his ideas with his students，Ye and Senior 2 Yu Shunxi who were very interested in the issue.?
They decided to do some serious research into the matter.To support their experiments，the school bought them advanced equipment.?
“I read a lot about the Mpemba effect.But，most explanations，either for or against，are usually based on guesswork（猜测）.We just wanted to let detailed experimental data （数据） do the talking，”said Huang.?
Dong Jiawen，a Senior 2 from Shanghai High School，joined the team.She spent all her weekends and all winter holidays working on the project.?
“I have learnt so much from carrying out over 100 experiments，”Dong said.“Most importantly，I've realized that you have to do something yourself in order to find out the truth.Books only serve as a kind of reference（参考）.”?
“The three girls have developed a matter of fact attitude to daily phenomena in the process of examining this effect，”said Huang proudly.?
The Mpemba Effect?
The Mpemba effect says that hot water freezes faster than cold water.The discovery was made by a high school student named Mpemba，in Tanzania（坦桑尼亚），Africa in 1969.He noticed the phenomenon while making ice cream.His teachers did not believe it was possible，and it took several years until university professors finally accepted his discovery.The phenomenon is extremely confusing and surprising even to most scientists. But it has been seen as real and studied in plenty of experiments.?
1.Ye Shasha .?
A.is a Senior 3 student from Shanghai High School?
B.doubted about the Mpemba effect when she was in primary school?
C.is one of the three girls who did the experiment?
D.is a very famous scientist of China?
2.Huang Zengxin .?
A.was given first prize for an article about the Mpemba effect?
B.is a physics teacher at Shanghai Xiangming Middle School?
C.discussed his ideas about this issue with his students this year?
D.is a famous physics scientist in Beijing?
3.The school .?
A.organized the science competition?
B.found three students to do the experiments?
C.bought advanced equipment to help them?
D.held a meeting to discuss this discovery
The easy way out isn't always easiest. I learned that lesson when I decided to treat Doug, my husband of one month, to a special meal. I glanced through my cookbook and chose a menu which included homemade bread. Knowing the bread would take time, I started on it as soon as Doug left for work. As I was not experienced in cooking, I thought if a dozen was good, two dozen would be better, so I doubled everything. As Dong loved oranges, I also opened a can of orange and poured it all into the bowl. Soon there was a sticky dough（面团）covered with ugly yellowish marks. realizing I had been defeated, I put the dough in the rubbish bin outside so I wouldn't have to face Doug laughing at my work, I went on preparing the rest of the meal, and, when Doug got home, we sat down to Cornish chicken with rice. He tried to enjoy the meal but seemed disturbed. Twice he got up and went outside, saying he thought he heard a noise. The third time he left, I went to the windows to see what he was doing. Looking out, I saw Doug standing about three feet from the rubbish bin, holding the lid up with a stick and looking into the container. When I came out of the house, he dropped the stick and explained that there was something alive in out rubbish bin. Picking up the stick again, he held the lid up enough for me to see. I felt cold. But I stepped closer and looked harder. Without doubt it was my work. The hot sun had caused the dough to double in size and the fermenting yeast （酵母）made the surface shake and sigh as though it were breathing. I had to admit what the 'living thing 'was and why it was there. I don't know who was more embarrassed（尴尬）by the whole thing ,Doug or me?
44．The writer's purpose in writing this story is ___________
A．to tell an interesting experience
B．to show the easiest way out of a difficulty
C．to describe the trouble facing a newly married woman
D．to explain the difficulty of learning to cook from books
45．Why did the woman's attempt at making the bread turn out to be unsuccessful?
A．The canned orange had gone bad.
B．She didn't use the right kind of flour.
C．The cookbook was hard to understand.
D．She did not follow the directions closely.
46．Why did the woman put the dough in the rubbish bin?
A．She didn't see the use of keeping it
B．She meant to joke with her husband.
C．She didn't want her husband to see it .
D．She hoped it would soon dry in the sun.
47．What made the dough in the rubbish bin make the noise?
A．The rising and falling movement.
B．The strange-looking marks.
C．Its shape.
D．Its size.
48．When Doug went out the third time, the woman looked out of the window because she was ______________.
A．surprised at his being interested in the bin
B．afraid that he would discover her secret
C．unhappy that he didn't enjoy the meal
D．curious to know what disturbed him
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