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.
【小题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 |
| 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 |
| 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 |
| 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 |
【小题1】B
【小题2】C
【小题3】A
【小题4】D
【小题5】C
解析试题分析：本文讲述科学家研制出一种固定在人膝盖上的发电装置。这种装置可通过收集人走路时损失的能量发电。
【小题1】推理题，第二段主要讲了这种电子装置的工作原理，即它是如何利用人步行来发电的。故选B。
【小题2】细节题，根据第四段中“it is too costly for most people to buy”可知这种实验版的设备费用太高，大多数人买不起。故选C。
【小题3】推断题。根据末段可知，过去Larry Rome发明的设备虽然也是靠行走获取能量，但是需要步行者背重达20到30公斤的负荷，而这种佩戴在膝盖上的设备重量只有1.5公斤，不需增加步行者的太多负担。故选A。
【小题4】细节题，根据文章第三段“the device could also be used in hospitals to operate heart pacemakers”可直接选出答案D项。A项文中没有涉及到，B项表述不科学，根据文章最后一段可以推断C项表述错误。故选D。
【小题5】主旨题，文章主要突出的内容是这种新的电子设备使得利用人步行获取能量变得轻松、容易。故选C。
考点：考查科技说明类短文
教材全解字词句篇系列答案科目：高中英语 来源： 题型：阅读理解
【小题1】What is the colour of blood in a vein near the surface of the skin?
| A．Blue. | B．Light yellow. |
| C．Red. | D．Dark reddish purple. |
| A．Because their spine is in active use. |
| B．Because they are more easily affected by gravity. |
| C．Because they keep growing backwards. |
| D．Because their spine becomes more bent. |
| A．In the long run，our brain probably works harder than our heart. |
| B．When our brain senses the spinning，we will feel dizzy. |
| C．The brains of the other mammals are as complex as those of humans. |
| D．Our feelings and emotions come from the most developed area in our brain. |
| A．To give advice on how to stay healthy. |
| B．To provide information about our body. |
| C．To challenge new findings in medical research. |
| D．To report the latest discoveries in medical science. |
查看答案和解析>>
科目：高中英语 来源： 题型：阅读理解
In most situations, light helps us see. But when it comes to looking at the night sky, light is actually a kind of pollution. It prevents our view of some of life’s most striking sights: stars, planets, and even galaxies(银河系).
“When I was a little boy, I loved the night sky. I remember looking up and the sky was filled with stars. I became an astronomer because I was amazed by their beauty,” says Robert Gent, “Now in most big cities kids can’t see the stars like I did.”
Normally, about 2,500 individual (单个的) stars are visible to the human eyes without using any special equipment. But because of light pollution, you actually see just 200 to 300 and fewer than a dozen from some cities. Only one in three Americans can see our own galaxy with the naked eyes. Those people live far away from the lights of big cities, office buildings, and shopping malls.
Fortunately, there’s an inexpensive and useful way. If we shine lights down at the ground instead of up into the sky, and use lower brightness levels, we can save big amounts of energy and keep the beauty of the night sky. Many cities and towns have passed laws limiting lights at night, making sure enough shine for safety without creating much light pollution.
Light pollution affects more than our view of the heavens and can harm wildlife. Migrating birds(候鸟) sometimes fly over cities and become confused by the brightness, flying in circles until they drop from exhaustion. Sea turtles need dark beaches for nesting and won’t approach bright lights. Too much light at night may even affect human health. For all these reasons, researchers are working on ways to use lights only when and where they are truly needed. Everyone deserves to look up at the sky.
【小题1】According to the text, using our naked eyes, ________.
| A．people in remote areas can see more stars than those in big cities |
| B．over one third Americans can see our own galaxy |
| C．about one in three Americans in big cities can see our own galaxy |
| D．Americans can only see 200 to 300 stars |
| A．save the electricity |
| B．make sure of migrating birds’ safety |
| C．let you count the number of stars |
| D．avoid much light pollution |
| A．The cause of light pollution. |
| B．The way to reduce light pollution. |
| C．The effect of light pollution. |
| D．People’s attitude towards light pollution. |
| A．air pollution | B．tiredness | C．breath | D．brightness |
| A．Light Pollution | B．Seeking the Sky | C．Stars in the Sky | D．City Pollution |
查看答案和解析>>
科目：高中英语 来源： 题型：阅读理解
Today, the biggest killers stem as much from our lifestyles as from bacteria and viruses. One of the worst of these is heart disease, and specifically high blood pressure. It’s a slow, but efficient killer that robs many people of what should be the last 10, 20 or 30 years of their lives.
Scientists are claiming that they have now separated unusual ingredients in a rare seaweed discovered by fishermen off the coast of Korea that offer incredible health benefits—including the ability to restore blood pressure to normal levels.
Dr. Haengwoo Lee, a famous biochemist conducted a clinical study on these two ingredients. The first is Seanol, an extremely rare seaweed extract(浓缩物) from Ecklonia Cava that's proven to be 100 times more powerful than any land-based antioxidant(抗氧化剂). That's because it stays working in your body for 12 hours, compared to land-based antioxidants that work for 30 minutes. "Its secret is its make-up of special chemicals that are a huge 40% fat soluble( 可溶的)," Dr. Lee explains. "Unlike nearly all land-based antioxidants that are water soluble, Seanol's protective compounds can get into things like the fatty tissues of your brain and penetrate（渗透） all three layers of your cells, including the outside, the oil-based cell membranes（细胞膜）, and your DNA." Indeed, Seanol is so powerful, it's the only FDA-approved Ecklonia Cava marine-algae (海藻) extract in existence.
The second ingredient is Calamarine, a deep-sea omega-3 discovery that delivers 85% more DHA omega-3s to your heart, brain, joints, and eyes. It's known to reduce the problems from tiredness and poor memory, joint pain, mood swings and depression.
With that research in mind, Dr. Lee combined Seanol and Calamarine with a high dose of vitamin D to form Marine-D3, the newest supplement in the fight against age-related illnesses and high blood pressure.
Dr. Lee found that Calamarine delivers some of the greatest concentration of omega-3s known to science. Combined with Seanol's ability to reduce body inflammation(炎症), as well as help cells get the nutrients they need to thrive, stay healthy and protected, Marine-D3 is able to boost a body's entire well being.
The makers of Marine-D3 are so confident that you'll see fast dramatic results from this product, that if you aren't happy after two full months, simply return the unused portion and they'll buy it back. They'll even give you ten dollars extra just for giving it an honest try! That kind of faith, combined with Dr. Lee's exhaustive research, shows that Marine-D3 really is a one-of-a-kind product.
【小题1】From the first paragraph we can infer that ________.
| A．Our lifestyles result from the biggest killers |
| B．our lifestyles do less harm to our bodies than bacteria and viruses do. |
| C．High blood pressure left untreated may cause shorter life. |
| D．Heart disease is incurable. |
| A．Fishermen off the coast of Korea have isolated unusual ingredients. |
| B．Scientists have purified ingredients that can lower blood pressure to normal standard. |
| C．Scientists discovered a rare seaweed. |
| D．Scientists have imagined a medicine that treat blood pressure. |
| A．According to FDA , Seanol reaches the agreed standard. |
| B．Seanol can be fat soluble entirely. |
| C．Seanol is a common seaweed extract fromEcklonia Cava. |
| D．Seanol's protective compounds can get into all things like the fatty tissues of your brain. |
| A．pessimistic | B．indifferent | C．doubtful | D．Optimistic |
查看答案和解析>>
科目：高中英语 来源： 题型：阅读理解
As people in Beijing and northern China struggle with severe air pollution this winter,the toxic(有毒的)air is also making life hard for plants and even food crops of China．
"in the last 50 years there has been a 1 6-fold increase in ozone(臭氧)pollution”in the Beijing area，said Hanqin Tian of Auburn University in Alabama,who studies the effects of China's pollution and climate change on plants．
Ozone is particularly harmful to plants because it damages the pores(气孔) on leaves，called stomata,which plants use to regulate how much water evaporates from the leaves．That，in turn，affectS how much water a plant must take up through its roots．Changes in water uptake by plants have been documented in other parts of the world，including the United States，as having major impacts on regional groundwater and surface water supplies．
In studies of the long-term productivity of plants，Hanqin Tian and some of his colleagues show that ozone pollution,along with climate change，has been lowering plant productivity in China,which reduces the amount of carbon and other pollutants that the plants Can absorb to fight all the emissions from the burning offossil fuels．
The worst effects on plants are likely to be in areas where the growing pollution problem is just fairly new, said Arthur Chappelka, also a plant researcher at Auburn University．Some plants are more resistant to pollutants than others，he said，and the plants that are living today in long-polluted urban areas are likely to be only those that are very pollution tolerant．
Away from the cities, however, where crops are necded to feed China’s yast population, the effeets of the growing pollution on crops is a significant concern.
“In some ways it affects the crop production and food securiy of China,”said Hanqin Tian.“Air quality is really important for human health, plants and ecosystem and sustainability.”
The problem is bound to get worse as China continues to develop economically, he said, and so he and other researchers continue to urge the Chinese government to take action to reduce emissions from cars and industries.
【小题1】ozone does harm to plants mainly by ________.
| A．exposing them to strong sunlight |
| B．damaging the structure of their leaves |
| C．adding more pores to the roots |
| D．making the land unfit for the plants to grow |
| A．Ozone pollution has increased 1 6 times in the past 30 years． |
| B．Ozone pollution has lowered plant productivity alone． |
| C．Plants can take in a large amount of carbon and other pollutants． |
| D．The toxic air has few effects on food supply in China． |
| A．Healthy foods are not available in Beijing． |
| B．Some kinds of plants aren’t affected by air pollution． |
| C．Crops in China are hard to feed its large population． |
| D．People should stop developing economically |
| A．care more about developing economy |
| B．reduce the number of cars and industries |
| C．continue to make more researches |
| D．take measures to reduce carbon emissions |
| A．Polluted air damages plants and crops |
| B．Air pollution is becoming more serious |
| C．China’s air pollution and climate changes |
| D．Food security in China |
查看答案和解析>>
科目：高中英语 来源： 题型：阅读理解
Life on Mars could become a reality and it could happen in your lifetime.
A welcoming planet
Scientists say Earth’s neighbor Mars, a bright red planet about half Earth’s size, is the most likely to support human life. Mars even has frozen water on its surface.
Since the late 1990s, NASA has been exploring Mars using remote-controlled vehicles（装置）. Most recently Curiosity, a car-size vehicle, traveled through space on an unpiloted spacecraft(航天器) and landed on Mars in August 2012. Directed by NASA scientists , the vehicles move on the surface, taking pictures , collecting and analyzing soil, and looking for signs of life.
But what about human explorers? Plans are already in the works to send astronauts to Mars as soon as the mid-2030s.
_____________________________________
But before you start packing your bags, let’s consider the challenges. For starters, Mars is far away. Just getting there could take up to 10 months.
Scientists already know that time away from Earth’s gravity harms the human body. Bones and muscles get weaker. The body produces less blood. What damage would months and months of living in space do?
And then there is the matter of water, oxygen, food and fuel. Scientists will have to find solutions to these problems, or the first humans on Mars won’t survive very long in their new home.
Tiny Dangers
There’s another tinier risk. It’s so tiny that you can’t even see it: germs.
Some scientists believe that our germs could pollute the whole planet of Mars. Potentially killing Martian life before we have the chance to discover it. Worse, there is a small but terrifying chance that any microscopic life already there might be harmful to us .
Worse still, if any of those Martian germs(火星细菌) were brought back to Earth, the result could be disastrous. Animals, plants, and people could be wiped out.
Worth the $$$?
A more practical concern is the cost. The price could approach $ 1 trillion(万亿). How can we justify spending that much when so many problems—poverty, disease—could use the cash here on Earth?
【小题1】Which of the following is TRUE according to the “A welcoming planet” part?
| A．Mars is a little bigger than Earth. |
| B．There are flowing rivers on Mars. |
| C．People haven’t been to Mars so far. |
| D．Scientists have discovered signs of life on Mars. |
| A．Living in space. | B．Limited resources. |
| C．Extreme conditions. | D．Interesting challenges. |
| A．there is no serious danger |
| B．people won’t be in any danger |
| C．it’s difficult for people to realize the danger |
| D．the danger may be caused by very small things |
| A．Martian germs may be different from those on Earth. |
| B．Martian germs may be brought back to Earth. |
| C．People may carry germs to Mars. |
| D．There may be germs on Mars. |
| A．People | B．History | C．Science | D．Business |
查看答案和解析>>
科目：高中英语 来源： 题型：阅读理解
Speaking two languages rather than just one has obvious practical benefits in an increasingly globalized world．But in recent years, scientists have begun to show that the advantages of bilingualism （双语能力） are even more important than being able to converse with a wider range of people．Being bilingual, it turns out, makes you smarter．It can have a deep effect on your brain, improving skills not related to language and even protecting against a serious mental disorder in old age．
This view of bilingualism is different from the understanding of bilingualism through much of the 20th century．Researchers, educators and policy makers long considered a second language to be an interruption that prevented a child's school work and ability to think and understand things．They were not wrong about the interruption: there is ample evidence that in a bilingual \s brain both language systems are active even when he is using only one language, thus creating situations in which one system disturbs the other．But this interruption, researchers are finding out, isn't so much a disturbance．It forces the brain to solve inside conflict, giving the mind a workout that strengthens its thinking muscles．
The key difference between bilinguals and monolinguals may be more basic: a heightened ability to monitor the environment．"Bilinguals have to switch languages quite often—you may talk to your father in one language and to your mother in another language," says Albert Costa, a researcher at the University of Pompea Fabra in Spain．
"It requires keeping track of changes around you in the same way that we monitor our surroundings when driving．" In a study comparing German-Italian bilinguals with Italian monolinguals on monitoring tasks, Mr．Costa and his colleagues found that the bilingual subjects not only performed better, but they also did so with less activity in parts of the brain involved in monitoring, showing that they did better in it．
【小题1】From the passage we can learn that experts used to believe that ______．
| A．interruption forced a bilingual's brain to strengthen its thinking ability |
| B．a second language stopped children's studying as well as mental development |
| C．using two languages annoyed the children who have trouble in learning skills |
| D．language systems were busy in a bilingual's brain when he was using languages |
| A．change | B．use | C．speak | D．study |
| A．Cautious． | B．Doubtful． | C．Concerned． | D．Favourable． |
| A．How Bilinguals Use Languages |
| B．What Bilingualism Is Really about |
| C．Why Bilinguals Are More Intelligent |
| D．When People Learn a Second Language |
查看答案和解析>>
科目：高中英语 来源： 题型：阅读理解
Thoughts claim our attention continuously, and waste our time and energy on unimportant and useless matters. They actually rule our life. We have become so used to this slavery, that we take it for granted, and have become unconscious of this habit, except on certain occasions.
While breathing, we do not need to pay attention to each inhalation and exhalation. We become conscious of the process of breathing only when we have some difficulty with breathing, such as when our nose is blocked, due to a cold, or when we are in an unventilated(不通风的) room.
It is the same with thinking. We become conscious of the constant onslaught of our thoughts, and of our inability to calm them down, only when we need to concentrate, solve a problem or study. We are also aware of them when we have worries or fears.
Look at the following familiar situation. You need to study something for an exam. You sit comfortably on the sofa with the book in your hands and start reading. After a while you feel hungry and go to the kitchen to eat something.
You return to read, and then hear your people talking outside. You listen to them for several moments and then bring your attention back to the book.
After a while you feel restless and switch on the radio to listen to some music. You continue to read for a little while, and then remember something that happened yesterday, and you start thinking about it.
When you look at your watch, you are amazed to find out that one complete hour has passed and you have hardly read anything. And at this time, you feel you’re thinking.
This is what happens when one lacks concentration. Imagine what you could have accomplished if you could control your attention and focus your mind!
【小题1】When can you feel you are thinking?
| A．While breathing. | B．While not reading. |
| C．When you need to concentrate. | D．When you waste your time. |
| A．To explain the course of thinking awareness. |
| B．To show how to get ready for an exam. |
| C．To present an example of concentration. |
| D．To emphasize the importance of reading. |
| A．In a guidebook of natural science. |
| B．In the front page of a newspaper. |
| C．In an advertisement part of a magazine. |
| D．In the section of psychology of a magazine. |
| A．the relationship between thoughts and breathing |
| B．how people’s thought and mind work |
| C．what happens when one wants to think |
| D．the ways to increase your thought |
查看答案和解析>>
科目：高中英语 来源： 题型：阅读理解
Everyone may all have the experience of feeling anxious and stressed when having a rough day or having some troubles. Different people may choose different ways to deal with it, and for most people a break for a 10-minute walk may be quite useful.www.zxxk.com
Anyway, here is another way around: to get a piece of chewing gum, and chew it. According to a Swinburne University of Technology study, gum-chewing has been found to “relieve anxiety, improve alertness(机敏性) and reduce stress among individuals in a laboratory setting.”
Some may argue that a laboratory is not the same as an office. But check out the conditions of the study: individuals were monitored while performing “a group of ‘multi-tasking’ activities.” Doesn’t it sound like the situation in the office?www.zxxk.com
Here’s a summary of some of the study’s findings:
Gum chewers showed a reduction in anxiety as compared to non-gum chewers by nearly 17 percent during mild stress and nearly 10 percent in appropriate stress.
Gum chewers showed improvement in alertness over non-gum chewers by nearly 19 percent during mild stress and 8 percent in moderate stress.
Improved Performance: Chewing gum resulted in a big improvement in overall performance on multi-tasking activities.
Although these aren’t major improvements, every little bit works and chewing a piece of gum is a lot quicker and easier than slipping outside for a 10-minute walk. So, how does gum work this magic? In part it does so by lowering the level of cortisol(皮质醇)—a steroid(类固醇) hormone that is released in response to stress in your system.
A few words of advice before you reach for the gum: don’t crack your gum, and be sure to chew it with your mouth closed. In fact, I’d say keep the gum out of meetings, because it really looks impolite to others around you.
【小题1】From the study in the text we know that_________________.
| A．gum chewers may lack alertness |
| B．gum chewers tend to be less stressed |
| C．gum chewers can finish many jobs perfectly |
| D．gum chewers can reduce their anxiety and anger easily |
| A．It works by improving alertness. |
| B．It works by allowing a 10-minute walk. |
| C．It works by reducing one’s level of cortisol. |
| D．It works by being chewed in a laboratory setting. |
| A．People should chew gum with their mouths closed in a meeting. |
| B．It is impolite to chew gum in a meeting with people around you. |
| C．People can crack gum freely when meeting friends. |
| D．People should be careful when chewing gum at home. |
| A．How to chew gum. | B．How to relieve stress. |
| C．Why people love chewing gum. | D．Chewing gum can relieve stress. |
查看答案和解析>>
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