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Electrical devices(仪器)could soon use power made by human energy. Scientists say they have developed an experimental device that produces electricity from the physical movement of a person walking , British scientist Max Donelan and other scientists in Canada and the United States developed the device.
The device connects to a person’s knee. As the person walks ,the device captures energy each time the person slows down. To do this ,the device helps with the slowing sown movement of the leg, the movements of the walking person push parts of a small machine that produces electricity. Using the device, an adult walking quickly could produce thirteen watts of electricity in just a minute. Donelan says walking at that speed could produce enough power to operate a laptop computer for six minutes.
There are several possible uses for the device. Developers say it could help people who work in areas without electricity to operate small computers. The device could also he used in hospitals to operate heart pacemakers(起博器), it could even be used to assist in the movement of robotic arms and legs.
The experimental version of the device weighs about one and a half kilograms, but it is too costly for most people to buy, but the researchers hope to make a lighter, less costly version, An improved version should be ready in one year.
The developers hope the device will one day help developing countries; nearly twenty five percent of people around the world live without electric power.
A similar product was invented in 2005 by Larry Rome of the University of Pennsylvania, He created a bag carried on a person’s back that also produces power from walking. The knee device does not produce as much electricity as the bag, but the bag requires the walker to carry a load of twenty to thirty kilograms.
1.. The second paragraph mainly talks about
A. who developed the device B. how the device works
C. several possible uses for the devices D. how much electricity the device can produce
2.. What is the disadvantage of the experimental version of the device?
A. It is too heavy for the walker to bear B. It is too complex for people to use
C. It is too expensive for most people to afford D. It will slow down one’s walking speed
3.. Compared with the device designed by Larry Rome, this new device
A. produces power without adding more loads to the walker
B. can produce more power in a much shorter time
C. needs to be equipped with a battery
D. can help the walker walk faster
4.. From the passage, we can learn that the electrical device can
A. help housewives operate the washing machine
B. make it much easier for us to go online
C. produce more electricity than that invented by Larry Rome
D. be applied in medical fields to operate heart pacemakers
5.. What would be the best title for the passage
A. First device powered by walking will soon be on the market
B. Advanced technology brings in a new way to operate heart pacemakers
C. Device gives new meaning to the idea of power walking
D Human energy will become a main source of electricity
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I love it at night. It’s peaceful. And when it cools down I sometimes do some ironing. I don’t really care for it. I work full-time and too busy for most housework. I remember the old woman who taught me to iron. I was about 15 and somehow got a live-in job taking care of a woman who had been an able-bodied, healthy woman until the accident that caused her to be paralyzed（瘫痪）.
The woman had an electric wheelchair. She could move her head and arms but not her hands or fingers. She had this clamp（夹子）attached to her arm and I’d have to open it and put a cup or a pencil in it and then she could move it. She would tell me how to do things. She would instruct me in great detail on the correct way to do things. Her home was perfect and beautiful. She would follow me around in her electric wheelchair to make sure I did everything exactly right. I’m sure she had been a perfect homemaker. She would have me fold everything, including socks and pillow cases. I would complain silently and wish terrible things on her. She taught me the right way to make the bed and tuck （塞）the corners. I know sometimes she’d get frustrated and impatient with me. I knew she wanted to grab it and do it herself. But she never yelled or scolded. Only insisted I do it right. I didn’t like it much, but I did it.
Today I can iron pretty well. I know where to start on a shirt, the right way to do the collar and sleeves. Now that I think about it, I don’t think she is an old lady. I think she might have been about my age now. Anyway, when I iron, I think of her and silently thank her for all the things I learned.
【小题1】From the passage we can infer that the writer of the passage now is ________.
| A．a housewife | B．a full-time worker |
| C．a clothes maker | D．a college student |
| A．she wanted to learn how to do housework |
| B．she was a relative of the disabled woman |
| C．she wanted to earn some money while sleeping and eating there |
| D．she had to do something in return to the lady for her kindness |
| A．eager to learn | B．unwilling to learn |
| C．forced to learn | D．careful to learn |
| A．Sympathetic | B．Fearful | C．Hateful | D．Grateful |
The following is a recent survey among teenagers:
| Radio Most teenagers nowadays are not regular listeners to radio. They may occasionally tune in, but they do not try to listen to a program specifically. The main reason teenagers listen to the radio is for music, but now with online sites streaming music for free they do not bother, and users can choose the songs they want instead of listening to what the radio presenter/DJ chooses. Television Most teenagers watch television, but usually there are points in the year where they watch more than average. This is due to programs coming on in seasons, so they will watch a particular show at a certain time (as long as it lasts) but then they may watch no television for weeks. Teenagers are also watching less television because of services such as BBC iPlayer, which allows them to watch shows when they want. Whilst watching TV, adverts come on quite regularly (18 minutes of every hour) and teenagers do not want to watch these, so they switch to another channel, or do something else whilst the adverts run. Newspapers No teenager that I know of regularly reads a newspaper, as most do not have the time and cannot be bothered to read pages and pages of text while they could watch the news summarized on the Internet or on TV. Internet Every teenager has some access to the Internet, be it at school or home. Home use is mainly used for fun (such as social networking) whilst school (or library) use is for work. Most teenagers are heavily active on a combination of social networking sites. Facebook is the most common, with nearly everyone with an Internet connection registered and visiting >4 times a week. Facebook is popular as one can interact with friends on a wide scale. For searching the web, Google is the dominant figure, simply because it is well known and easy to use. Some teenagers make purchases on the Internet (on sites like eBay) but this is only used by a small percentage, as a credit card is required and most teenagers do not have credit cards. Many teenagers use YouTube to watch videos (usually anime which cannot be watched anywhere else) and some use it as a music player by having a video with the music they want to listen to playing in the background. Mobile Phones 99pc of teenagers have a mobile phone and most are quite capable phones. Usually, teenagers only use their phones for texting, calling. Features such as video messaging or video calling are not used—because they are expensive. Services such as instant messaging are used, but not by everyone. It usually depends whether the phone is Wi-Fi compatible, because otherwise it is very expensive to get Internet off the phone network. As most teenagers’ phones have Bluetooth support, and Bluetooth is free, they utilize this feature often. Mobile email is not used as teenagers have no need; they do not need to be connected to their inbox all the time as they don’t receive important emails. |
The survey carried out recently is mainly concerned with ______.
A. how teenagers consume media
B. what electric devices teenagers favor
C. which new trend teenagers are following
D. how teenagers contact others and make their social net
As is mentioned in the survey, the reason why teenagers watch less TV mainly lies in that ______.
A. teenagers do not watch regular programs
B. all the TV programs are on for only a few weeks
C. teenagers may turn to other devices to watch their favorite
D. the TV adverts coming on every channel are just the same
Which of the following is TRUE according to the survey?
A. Radio presenter or DJ used to invite the listeners to choose the songs they want.
B. The main source for teenagers to get news is Internet as well as newspapers.
C. Google is the most common social networking sites due to its convenience.
D. Some features of modern mobile phones are not widely used by teenagers.
查看习题详情和答案>>What if we could replace oil with a fuel which produced no pollution and which everybody had equal access to?The good news is that we can, In fact, we are swimming in it—literally.
Hydrogen is one of the building blocks of the universe ,Our own sun is basically ,a big ,dense cloud of the stuff ,And hydrogen can be used to create electricity for power ,heat and light.
The problem is that hydrogen is everywhere and nowhere at the same time , It does not exist as a material on its own ,but is always part of something else, So it has to be separated before it can be used.
Most commercial hydrogen in use now is created from natural gas , As oil will start to run out in around the year 2030.,it makes sense to produce as much hydrogen as possible as soon as we can ,But natural gas supplies will also begin to run out soon after, Another source is needed.
Researchers are now using electricity to make water into hydrogen ,Companies are working on the problem in their own areas ,The first commercial hydrogen ,”fuel cells”for computers and mobile phones have already come on to the market ,Auto companies have also invested over US ＄2billion in the production of hydrogen fuelled cars
Thd nations of a hydrogen fuelled planet would not fight over evergy recourses, There would be a great reduction in pollution ,The only by-product of creating hydrogen is pure drinking water—something that is very scarce in many parts of the world ,But that is not where the good news ends, Once the costs of producing hydrogen have been brought down ,it will possibly provide power for a third of the Earth ‘s population that has no electricity.
And electricity creates wealth, In South A frica over the last decade there has been a large programme of electrification, Thanks to the programme, people do not have to spend their days looking firewood to burn for heat, And with electric light , they can work long into the night.
Some scientists see radical changes in the way the human race co-operates, Hydrogen creates clectricity, and is also created by it. With dual use fuel cells, everyone who consumes energy could also produce it ,Late at night, a man drives home in London and connects his car into the “world-wide hydrogen web”, which it supplies with electricity ,A few hours later, a man in Beijing uses that electricity to power the hydrogen cell in his car, Hydrogen could be the first democratic energy source.
Like all dreams of the future, it seems very far away, But the threat of war and terrorism in the Middle East has made governments and businesses more aware of the need to edn oil dependency and spend more time and money on hydrogen resource, So maybe the threat of war is not a completely bad thing for the future of the human race.
1.What does the underlined word “it”in the last but one paragraph refer to?
A、wealth B、hydrogen C、electricity D、fuel
2.What is the problem with using hydrogen as energy?
A、It has by-products
B、It has to be separated from other materials
C、It will make energy too cheap
D、It is too far away from us
3.Why does the author give the example in the last but one paragraph?
A、To tell us that we produce energy while using hydrogen power
B、To tell us that hydrogen power does not produce pollution
C、To show hydrogen power can stop war
D、To show hydrogen power is cheap
4.What is the author’s attitude about the future?
A、skeptical B、negative C、indifferent D、positive
5.What is the passage mainly about?
A、war and energy
B、the future of hydrogen as an energy resource
C、the disadvantages of oil
D、How to end war
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完成句子。注意正确变形。（共5小题；每小题3分，满分15分）
【小题1】除了很少的几句外，我对法语一无所知。
________ _________ __________ few words, I do not know any French at all.
【小题2】在英国，电气化火车已经取代了蒸汽机车。
Electric trains have ______ ______ ______ of steam trains in England.
【小题3】就在这个时候，我看见了王平，于是又跟在他的后面飞去。
Just then I ______ ______ ______ Wang Ping and flew after him.
【小题4】只有在那时，我才认识到健康的重要性。
_______ _______ _______ I realize the importance of my health.
【小题5】对我来说你说什么都无所谓，反正我不去。
It ______ _______ ________ to me what you say: I`m not going.