题目内容
_____________ you did yesterday is right.
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
Heavy snow blanketed Anhui and Hubei provinces yesterday, cutting off power to some villages and blocking roads. Meanwhile, more snow is expected to cover the south in the coming three days.
Meteorologists said that the snow, which started Sunday night, is expected to fall throughout the south until this Friday, with temperatures falling below zero. The precipitation is expected to help relieve the severe drought conditions.
The temperature in the north will rise after this Friday and the south will be warmer after Nov 22nd, forecasters predicted yesterday.
The national meteorological watchdog issued an orange alert-the second—highest level-for snowstorms yesterday morning, warning that snowfalls in some areas will reach 20 mm at most.
Snowstorms refer to snowfalls that reach 10 mm in 24 hours. Snowfalls below 10 mm and above 5 mm are called heavy snows.
Last Friday, officials from the Hubei provincial government asked the transportation department, the meteorological bureau and related departments be fully prepared for the coming snow, with an emergency team ready to provide around-the-clock assistance.
The predicted snow in the south did not bring much trouble to air and rail travel with advance preparation.
The provincial education bureau declared an emergency plan on Sunday, asking primary and high schools to close when the snowstorms become severe.
The 16 expressways in snow-hit places in Hubei were scattered with 42.8 tons of snow-melting agents and about 4.580 sqm of anti-slip fabric. The latest information from the provincial expressway administration yesterday showed that traffic flowed smoothly during the snow.
The Tianhe Airport in Wuhan, Hubei province, had seven snow-melting vehicles working to ensure timely take-offs and landings.
The Anhui meteorological bureau declared all emergency alert because of the snowstorm on Sunday, with 43 cities and counties issuing alerts for snows and two issuing alerts for frozen roads. Shucheng county and Huoshan county issued time top alert because of the snowstorms on Sunday.
Luogang airport in Hefei, Anhui Province, was shut down for four hours since 7 a.m. yesterday due to the heavy snow, Xinhua reported.
The snow caused time rush-hour traffic to be heavily congested and many commuters left home earlier than usual in the morning.
Ye Wei, a worker at Hefei University of Technology, said his ride to work took a half-hour more than usual.
“Maybe tomorrow I will have to get up one hour earlier than before, because of the frozen roads,” Ye said.
The heavy snow first hit northern China, claiming dozens of lives, causing hundreds of injuries, paralyzing the traffic and grounding hundreds of flights.
The whiteout that began Nov 9th has killed at least 32 people and affected more than 9.6 million in seven provinces. More than 15,000 buildings have collapsed and nearly 300, 000 hectares of farmland have been destroyed, Ministry of Civil Affairs officials said on Sunday.
The snowfall was the heaviest in the past six decades in some northern and central provinces like Hebei, Shanxi, Shaanxi and Henan, with an economic loss reaching 7 billion yuan（$ 1.02 billion）, ministry officials said.
67．Which of the following call be the best title for this passage?
A．Heavy Snow Coming to Southern China.
B．Heavy Snow Blanketed Anhui and Hubei.
C．Snowy All Over China.
D．China in the Future Will Be Cold.
68．The underlined word “precipitation” in the second paragraph probably refers to _______.
A．impulsive approach B．prediction of snow
C．violent haste D．fall of snow
69．What can be inferred from the passage?
A．Many airports in Anhui Province were shut down for a long time.
B．The snowfall was the heaviest in the human history.
C．Some measures have been taken to deal with the emergency.
D．This snowfall hasn’t brought about any deaths.
70．You may probably read this passage in ________.
A．a poster B．a magazine C．a science fiction D．a newspaper
