At the moment, there are two reliable ways to make electricity from sunlight. You can use a panel of solar cells to create the current directly, by liberating electrons from a semiconducting material such as silicon. Or you can concentrate the sun’s rays using mirrors, boil water with them, and employ the steam to drive a generator.
Both work. But both are expensive. Gang Chen of the Massachusetts Institute of Technology and Zhifeng Ren of Boston College therefore propose an alternative. They suggest that a phenomenon called the thermoelectric（热电）effect might be used instead—and they have built a prototype（原型）to show that the idea is practical.
Thermoelectric devices are not new. They are used, for example, to capture waste heat from car engines. They work because certain materials generate an electrical potential difference within themselves if one part is hotter than another. That can be used to drive a current through an external circuit.
The reason thermoelectric materials have not, in the past, been applied successfully to the question of solar power is that to get a worthwhile current you have to have a significant temperature difference. (200℃ is considered a good starting point.) In a car engine, that is easy. For sunlight, however, it means concentrating the heat in some way. And if you are going to the trouble of building mirrors to do that, you might as well go down the steam-generation route, which is a much more efficient way of producing electricity. If the heat concentration could be done without all the equipment of mirrors, though, thermoelectricity’s inefficiency would be balanced by the cheapness of the equipment.
In their view, three things are needed to create a workable solar-thermoelectric device. The first is to make sure that most of the sunlight which falls on it is absorbed, rather than being reflected. The second is to choose a thermoelectric material which conducts heat badly but electricity well. The third is to be certain that the temperature gradient（梯度）which that badly conducting material creates is not wasted by poor design.The following methods can be adopted to make electricity from sunlight EXCEPT .
| A．putting a panel of solar cells into use |
| B．concentrating sun’s rays with mirrors |
| C．creating a solar-thermoelectric device |
| D．building a practical solar prototype |
Why was the application of thermoelectric materials a failure in the past?
| A．Because it’s hard for them to build enough mirrors to make it work. |
| B．Because 200℃ was hard to reach at that time even in a car engine. |
| C．Because of the failure of having a significant temperature difference. |
| D．Because it was hard to focus the sun’s rays with equipment of mirrors. |
Which of the following is the best title for this passage?
| A．Thermoelectric Device --- the Best Method of All |
| B．A New Method of Making Electricity from Sunlight |
| C．How to Create a Workable Thermoelectric Device |
| D．Solar Power --- a New Energy Trend in the Future |
When I was going home to India last year, I called up my mother to ask if she wanted anything from China．
When India had not opened up its markets to the world, I carried suitcase loads of dark glasses and jeans．Thankfully, we can get all these anywhere in India now．
Still, her answer surprised me: “Green tea．”
As long as I can remember she didn’t even drink Indian tea ．
I dutifully bought a big packet of Longjing and headed home to hear the story．My mother and her brother, both regular newspaper readers, believed that Chinese green tea was the wonder drug for all illnesses．
At the turn of the century, China was not really familiar to the average Indian．It was a strange country．
How things change! And how soon!
Now every town of any size seems to have a “China Market”．And everyone is talking about China．
The govemment of Indin has planned to send a team to China to see how things are done．A minister once said that India must open the doors for more foreign investment(投资)and such a step would “work wonders as it did for China”．
But it’s a two-way street．I just heard about a thousand Shenzhen office workers who have gone to Bangalore to train in software．Meanwhile, all the Indian IT majors are setting up a strong presence in China．
No wonder that trade, which was only in the millions just ten years ago, is expected to hit about US $15 billion for last year and US $20 billion by 2008, a goal set by both governments．
No wonder, my colleague wrote some weeks ago about this being the Sino-Indian(中印)century as the two countries started on January 1 the Sino-Indian Friendship Year．
But what is still a wonder to me is my mother drinking Chinese tea．
1．According to the passage, the author left _____ for ______．
A．India; China B．China; India
C．China; Longjing D．India; Shenzhen
2．The reason why the writer’s mother asked for Chinese green tea is that_____．
A．she had a son working in China B．she believed it had a curing effect
C．she enjoyed Chinese products D．she was tired of Indian tea
3．The underlined part “it’s a two-way street” in Paragraph 10 probably means ____．
A．The exchanges between Indian and China benefit both．
B．China and India have different traffic rules．
C．Tea trade works wonders in both India and China．
D．Chinese produces are popular in both China and India．
4．It can be inferred from the passage that _______．
A．the author was concerned for his mother’s health
B．the author was in favor of drinking Chinese green tea
C．the author was surprised at China’s recent development
D．the author was curious about the growth of India’s IT industry
CARDIFF, Wales Poets, singers and musicians from across the globe gathered in Wales to celebrate the tradition(传统) of storytelling.
“It might seem strange that people still want to listen in age of watching television, but this is an unusual art form whose time has come again,” said David Ambrose, director of Beyond the Border, an international storytelling festival(节) in Wales.
“Some of the tales, like those the Inuit from Canada, are thousands years old. So our storytellers have come from distant lands to connect us with the distance of time,” he said early this month.
Two Inuit women, both in their mid 60s, are among the few remaining who can do Kntadjait, or throat singing, which has few words and much sound. Their art is governed by the cold of their surroundings, forcing them to say little but listen attentively.
Ambrose started the festival in 1993, after several years of working with those reviving (coming back into use or existence) storytelling in Wales.
“It came out of a group of people who wanted to reconnect with traditions. and as all the Welsh are storytellers, it was in good hands here.” Ambrose said.
1. Ambrose believes that the art of storytelling _______.
A. will be more popular than TV
B. will be popular again
C. started in Wales
D. are in the hands of some old people
2. From the tales told by the Inuit, people can learn _______.
A. about their life as early as thousands of years ago
B. why they tell the stories in a throat-singing way
C. how cold it has been where the Inuit live
D. how difficult it is to understand the Inuit
3. According to the writer, which of the following is NOT true?
A. Storytelling once stopped in Wales.
B. Storytelling has a long history in Wales.
C. Storytelling is always well received in Wales.
D. Storytelling did not come back until 1993 in Wales.
4. The underlined phrase in good hands means _______.
A. controlled by rich people B. grasped by good storytellers
C. taken good care of D. protected by kind people
Tales of the supernatural are common in all parts of Britain. In particular there was（and perhaps still is）a belief in fairies. Not all of these fairies are the friendly, people-loving sprites that appear in Disney films. In some folktales they are cruel and cause much human suffering. This is true in the tales about the changeling. These tell the story of a mother whose baby grows sick and pale and is changed so much that it is almost unrecognizable to the parents. It was then feared that the fairies had come and stolen the baby away and replaced the human baby with a fairy changeling. This was most likely to happen between birth and the baby’s baptism. There were many ways to prevent this from happening: hanging a knife over the baby’s head while he slept or covering him with some of his father’s clothes were just two of the recommended（推荐）methods. However, hope was not lost even if the baby had been stolen .In those cases there was often a way to get the real baby back. You could place the changeling on the fire—then it would rise up the chimney, you would hear the sound of fairies’ laughter and soon after you would find your own child safe and sound nearby. Or, if you were more cautious（谨慎）,perhaps there was a magic well in the neighbourhood where you could leave the changeling overnight, and in the morning you would return to find your own baby there without a scratch（划痕）on him.
1. Another word in the passage which is closest in meaning to the underlined word sprites is ______.
A. changeling B. baptism C. folktales D. fairies
2.The writer described ______ways to prevent babies from being stolen and ______ways to save a stolen baby.
A. Many; two B. Two; two C. Two; three D. Two; four
3.Which is not stated but can be inferred from this passage?
A. Some sick babies might have been killed with the recommended methods.
B. There are bad fairies as well as good fairies.
C. Lots of stolen babies were saved with the recommended methods.
D. Fairies would laugh if they found a changeling rise up the chimney.
Northern Europeans spend a lot of time in their cold and cloudy winters planning their summer holidays. They are proud of their healthy color when they return home after the holiday. But they also know that a certain amount of sunshine is good for their bodies and general health.
In ancient Greece people knew about the healing(治疗) powers of the sun, but this knowledge was lost. At the end of the nineteenth century a Danish doctor, Niels Finsen, began to study the effect of sunlight on certain diseases, especially diseases of the skin. He was interested not only in natural sunlight but also in artificially (人造地) produced rays. Sunlight began to play a more important part in curing sick people.
A Swiss doctor, Auguste Rollier, made full use of the sun in his hospital at Lysine. Lysine is a small village high up in the Alps. The position is important: the rays of the sun with the greatest healing power are the infra-red (红外线的) and ultra-violet (紫外线的) rays; but ultra-violet rays are too easily lost in fog and the polluted air near industrial towns. Dr. Roller found that sunlight, fresh air and good food cure a great many diseases. He was particularly successful in curing certain forms of tuberculosis with his “sun-cure”.
There were a large number of children in Dr. Roller’s hospital. He decided to start a school where sick children could be cured and at the same time continue to learn. It was not long before his school was full.
In winter, wearing only shorts, socks and boots, the children put on their skis after breakfast and left the hospital. They carried small desks and chairs as well as their school books. Their teacher led them over the snow until they reached a slope which faced the sun and was free from cold winds. There they set out their desks and chairs, and school began.
Although they wore hardly any clothes, Roller’s pupils were very seldom cold. That was because their bodies were full of energy which they got from the sun. But the doctor knew that sunshine can also be dangerous. If, for example, tuberculosis is attacking the lungs, unwise sunbathing may do great harm.
Today there is not just one school in the sun. There are several in Switzerland, and since Switzerland is not the only country which has the right conditions, there are similar schools in other places.
1. According to the passage, when did sunlight begin to play a more important part in the treatment of disease?
A. From ancient times. B. At the end of the nineteenth century.
C. Not until this century. D. Only very recently.
2. Why are a Danish doctor and a Swiss doctor mentioned in the second and third paragraphs?
A. Because they both made use of sunlight to treat illness.
B. Because they were the first people who used sunlight for treatment.
C. Because they were both famous European doctors.
D. Because they used sunlight in very different ways.
3. Dr Roller set up a “sun-cure” school probably for the reason that _______.
A. most children could stay in his hospital
B. children could study while being treated
C. the school was expected to be full of pupils
D. the school was high up in the mountains
4. What can be inferred from the last paragraph of the passage?
A. “Sun-cure” schools are becoming popular everywhere.
B. Switzerland is the only country where “sun-cure” schools are popular.
C. Proper conditions are necessary for the running of a “sun-cure” school.
D. “Sun-cure” schools are found in countries where there is a lot of sunshine.
Move Earth—it’s no science fiction
LONDON-Scientists have found an unusual way to prevent our planet from overheating: move it to a cooler spot. All you have to do is send a few comets（彗星）in the direction of Earth, and its orbit will be changed. Our world will then be sent spinning into a safer, colder part of the solar system.
This idea for improving our climate comes from a group of US National Aeronautics and Space Administration（NASA） engineers and American astronomers. They say their plan could add another six billion years to the useful lifetime of our planet—effectively doubling its working life.
The plan put forward by Dr Laughlin, and his colleagues Don Korycansky and Fred Adams
,needs carefully directing a comet or asteroid so that it passes close by our planet and sends some of its gravitational energy to Earth.
“Earth’s orbital speed would increase as a result and we would move to a higher orbit away from the Sun,”Laughlin said.
Engineers would then direct their comet so that it passed close to Jupiter or Saturn. The comet would pick up energy from one of these giant planets. Later its orbit would bring it back to Earth, and the process would be repeated.
In the short term, the plan provides an ideal way to global warming, although the team was actually concerned with a much greater danger. The sun is certain to heat up in about a billion years and so “seriously compromise” our biosphere（生物圈）—by cooking us.
That’s why the group decided to try to save Earth.
The plan has one or two worrying aspects, however. For a start, space engineers would have to be very careful about how they directed their asteroid or comet towards Earth. The smallest miscalculation（误算）in orbit could fire it straight at Earth—with deadly consequences.
There is also the question of the Moon. As the current issue of Scientific American magazine points out, if Earth was pushed out of its current position it is “most likely the Moon would be stripped away from Earth,” it states. This would greatly change our planet’s climate.
1. What makes the scientists plan to move Earth?
A. A few comets are moving to the direction of Earth.
B. Earth’s working life is coming to an end soon.
C. Earth will become too hot for mankind to keep alive.
D. The moon is moving farther and farther away from Earth.
2.If the plan is successful, Earth will have a working life of ______years.
A.12 billion B.6 billion C.18 billion D.24 billion
3.What serious problems might the plan cause according to the passage?
A. The comet might hit Earth and man might lose the moon.
B. Earth might be moved too far away and man might be frozen to death.
C. The comet might hit Jupiter or Saturn and never return to Earth.
D. Earth’s working life might be greatly shortened.
4.What does the underlined word “compromise” mean?
A. provide B. benefit C. share D. endanger
5.Which of the following best shows how the plan would work?