. gas leaks and similar accidents should occur, some responsible persons should regularly inspect all the laboratories. A) Unless B) In case C) Provided D) Until 题目和参考答案——青夏教育精英家教网—

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.________ gas leaks and similar accidents should occur, some responsible persons should regularly inspect all the laboratories.

A) Unless B) In case C) Provided D) Until

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A technique that controls immediate gas explosions by spraying them with large droplets of water is being tested by scientists at the University of Wales, United Kingdom．Instead of using the traditional fine water sprays when a gas leak is detected, the researchers have discovered that large droplets help to draw in some of the force of any explosion and provide a better way of controlling fire．

The research is based on studies made of the Piper Alpha oil rig （油井） explosion that occurred in the North Sea nine years ago killing 167 workers．The Welsh team found that by covering the gas-leak area with water droplets, the explosion and its effect can be greatly reduced．

Dr Gerand Thomas, a good lecturer in physics at the university’s Center for Explosion Studies, said that it was impossible to deal with gas explosions in the same way as fires because the whole event may only last a quarter of a second and normal water sprays do not have time to be effective．

Using the droplets of water to hold explosions resulted in the water being turned into a mist that allows some force of the explosion to be reduced．The mist slows down the combustion （燃烧） process and can stop a large amount of the gas igniting （点火,燃烧）, thus greatly reducing damage by limiting pressure development．With such a system, the operator has to decide at what point after a gas leak to activate the sprays．

The Center for Explosion Studies is the first of its kind in the UK and has been purposely-built for the study and implication of industrial explosions on land and sea．Research is developed to the causes of accidental explosions and they might be prevented．Full-sized imitative buildings can be built at the center where explosions and fires are created to test preventative equipment using sensors to monitor their efficiency．

Another area that the Welsh researchers have been looking at is how materials respond to explosions．The center also carries out research requested by individual customers．

Which of the following would be the best title for the passage?

A．Piper Alpha Oil Rig Explosion

B．Large Droplets of Water

C．A New Way of Controlling Gas Explosions

D．The center for Explosion Studies

The research finds that _____ in holding immediate explosion．

A．small water sprays are better than large droplets of water

B．small water sprays are not as good as large droplets of water

C．both small water sprays and large droplets of water are good

D．neither small water sprays nor large droplets of water is good

Dr Geraint Thomas implies that ______．

A．normal water sprays can put out fire effectively

B．gas explosions break out more quickly than fires

C．fires are easier to be held than explosions

D．gas explosions break out so quickly that there is no way to control it

Which of the following is not included in the research area of the Center for Explosion Studies?

A．To test the result of gas explosion．

B．To get some implications of industrial explosions on land and sea．

C．To find out how materials respond to explosions．

D．To find out when material respond to explosions．

To my family and friends,
I have just started my tour of the area badly affected by the war. Everything is going really well, so no   16 . The land is beautiful but unfortunately it has a lot of   17 too. Let me   18 .
Last week, 120 school girls were   19 by a gas leak（泄漏）. Most have recovered but six are still in   20 . Even though the local government speaks about the   21 of education, most of the kids here only attend school for four hours a day if they are lucky. They are so excited and   22 to learn, but then have to   23 things like being attacked. Most of these kids are   24 and can’t afford a pencil or even paper. So I’m planning a trip to several schools to talk about   25 and to give these kids some of the   26 they need. That is where all of you can help. If you can   27  whatever school supplies you have available, that would be   28 appreciated.
I know how busy you are so thank you for taking the   29 to do this and I will post pictures of this   30 after I return.
Thank you again.
Todd Tucker

YUZHOU, HENAN –An accident in a central China coal mine killed 21 miners Saturday and left another 16 trapped underground , the government said.
The death toll rose to 26 Sunday morning as rescuers were battling to reach the 11 miners who were still trapped underground, rescue headquarters said.
Rescuers were battling to reach the 11 miners still trapped underground, but chances for them to survive were very slim, said Du Bo, deputy chief of the rescue headquarters.
"Based upon past experience, the remaining 11 miners could be buried in coal dust, so the survival chances are frail," Du said.
More than 2,500 tons of coal dust smothered(厚厚的覆盖) the pit after the gas leak（漏出）, which hampered（阻碍） the rescue, said Du.
The gas outburst happened at 6:03 a.m. Saturday when 276 miners were working underground in the mine in Yuzhou City. A total of 239 workers escaped but 21 were found dead and 16 trapped.
An initial（最初的） investigation showed that 173,500 cubic meters of gas leaked out in the accident. Liu Wenbin, a deputy chief engineer of the company that owns the mine, was in the pit（矿井） when the accident happened. He organized the escape.
"At around 6 a.m., I felt there was something wrong with the airflow in the shaft, and one of the team captains told me he also felt it and had already reported the problem," said Liu
The mine is owned by Pingyu Coal & Electric Co. Ltd., a company jointly established by four investors, including Zhong Ping Energy Chemical Group and China Power Investment Corp.
【小题1】What could be the best title for this passage?

A．Death Toll Rises in an Accident in China

B．A Coal Mine Accident in Central China

C．An Accident in Central China

D．Coal Mine Accidents in China

【小题2】What does the underlined part mean in the second paragraph?

A．payment required for the use of rescuing persons

B．the number of people killed in a particular accident

C．the percentage of the dead persons in an accident

D．a number of people killed in an accident

【小题3】From this passage we know that ____.

A．Of the 276 miners in the mine only 21 were dead until the next morning

B．The miners trapped underground would be saved without difficulty

C．16 miners trapped underground were still found alive waiting for the rescue

D．Until the next morning another 5 miners were found dead in this accident

【小题4】According to the writer, which of the following is not true?

A．The mine was owned by more than one company

B．There was at least one more similar accident happening in Central China before

C．Before the accident happened there was no sign of something wrong

D．When the accident happened one of the mine owners was in the pit

Priscilla Ouchida’s “energy-efficient” house turned out to be a horrible dream. When she and her engineer husband married a few years ago, they built a $100,000 three-bedroom home in California. Tightly sealed to prevent air leaks, the house was equipped with small double-paned (双层玻璃的) windows and several other energy-saving features. Problems began as soon as the couple moved in, however. Priscilla’s eyes burned. Her throat was constantly dry. She suffered from headaches and could hardly sleep. It was as though she had suddenly developed a strange illness.

Experts finally traced the cause of her illness. The level of formaldehyde (甲醛) gas in her kitchen was twice the maximum allowed by federal standards for chemical workers. The source of the gas? Her new kitchen cabinets and wall-to-wall carpeting.

The Ouchidas are victims of indoor air pollution, which is net given sufficient attention partly because of the nation’s drive to save energy. The problem itself isn’t new. “The indoor environment was dirty long before energy conservation came along,” says Moschandreas a pollution scientist at Geomet Technologies in Maryland. “Energy conservation has tended to accentuate the situation in some cases.”

The problem appears to be more troublesome in newly constructed homes rather than old ones. Back in the days when energy was cheap, home builders didn’t worry much about unsealed cracks. Because of such leaks, the air in an average home was replaced by fresh outdoor air about once an hour. As a result, the pollutants produced in most households seldom build up to dangerous levels.

1. It can be learned from the passage that the Ouchidas’ house __________

A. is well worth the money spent on its construction

B. is almost faultless from the point of energy conservation

C. failed to meet energy conservation standards

D. was designed and constructed in a scientific way

2. What made the Ouchidas’ new house a horrible dream?

A. Lack of fresh air. B. Poor quality of building materials.

C. Gas leak in the kitchen. D. The newly painted walls.

3. The underlined word “accentuate” in the third paragraph most probably means ___________.

A. control B. worsen C. relieve D. improve

4. This passage is most probably taken from an article entitled “_________”.

A. Energy Conservation B. Houses Building Crisis

C. Air Pollution Indoors D. Traps in Building Construction

All the students at school are required to ____ lectures by the experts on howto save themselves when accidents occur, such as fires, a gas leak and so on.

A. join in B. take part in C. attend D. participate in

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