题目列表(包括答案和解析)
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
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
When many people are worried that there are no more heroes in the modern
times two university students who lost their lives to rescue drowning children have
shown that heroes still exist（存在）．
According to the Inner Mongolia Morning Post，the tragedy（悲剧） occurred on the afternoon of December 14,2002 when three school students skating on a frozen lake in Qingcheng Park in Hohhot fell through the ice into the freezing water．More than 20 university students who happened to be near the spot immediately went to the rescue of the children．
Two children were quickly rescued，but the third died．The child's body was not found for three hours．Two of the rescuers，Liu Ye and Hao Longbiao，also died of cold and exhaustion（筋疲力尽）．The body of Hao who took the lead in jumping into the lake was not found until the next day．
A student who was unwilling to tell his name said he and his classmates from the local college were taking photos at the lake. When they heard the children's cries for help, they went to the ice hole hand in hand to rescue the children．But the ice kept breaking, causing most of them to fall into the icy water．
Local residents held mourning ceremonies（祭奠仪式） at the lake． Eight of the students were seriously affected by the freezing water and were being kept in hospital for further observation, but their lives were no longer in danger．
46. The underlined word “occurred” here means“＿＿＿＿”．
A. employed B. mixed C. guided D. happened
47 When the three students fell into water, the university students were ＿＿．
A. skating on the ice B. taking photos at the lake
C. having a picnic D. walking along the lake
48 Which of the following is TRUE according to the passage？
A. Three students died on the same day in all．
B. Hao Longbiao’s body was found on December 14,2002．
C. The university students didn’t think it dangerous to save the drowning
children in the lake．
D. Local residents were not brave in face of danger．
49. It can be inferred that ＿＿＿＿．
A. people think little of the two university students' death
B. the ice on the lake wasn't strong enough to skate on
C. some students regretted for what they had done
D. heroes don't agree with the steps of modern times
50. The author wrote the passage to ＿＿＿＿．
A. warn people of the danger of skating on ice
B. call on people to learn from the brave university students
C. tell us a tragedy
D. advise university students to cherish（珍惜） their lives
湖北省互联网违法和不良信息举报平台 | 网上有害信息举报专区 | 电信诈骗举报专区 | 涉历史虚无主义有害信息举报专区 | 涉企侵权举报专区
违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com