游客
题文

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.
. 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

. 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

. 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

. 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

. 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

科目 英语   题型 阅读理解   难度 中等
登录免费查看答案和解析
相关试题

Social rules or laws on marriage vary widely between countries.Some countries, still do not have a legal minimum age for marriage, which makes child macriages are very common, there.
In the Western Christian countries, a 13 -year -old is still considered a child.Even getting married in one* s late teens is not usually encouraged because married life is likely to interfere with a young woman' s education and consequently restrict opportunities in later life.And there are also physical dangers in giving birth so young.
In Muslim countries such as Saudi Arabia, Iran and Pakistan, the age of puberty(青春期)at around 13 or 14 is the legal age for marriage, but in Turkey it is 15, and in Egypt and Tunisia, 18 the same minimum age as in many Western countries.It is argued that by allowing, earlier marriages, Islamic law is promoting stable relationships, while Western laws are encouraging promiscuity among young people.
In many countries, the trends of urbanization and education for girls have seen a drop in the number of child brides.However, early marriages continue to occur in poor rural areas.In India, for example, the legal age of marriage for a girl is 18 and to a boy, 21.Yet, according to government statistics, 18 percent of ten to fourteen-year old girls in the poor, rural state of Rajasthan in the northwest of the country are married.It is clear, then, that child marriages are connected with poverty, lack of education, rural customs as well as religion.So there don't tend to be any child marriages in urban or rich areas.
57.The underlined word "promiscuity" in the third paragraph means ____.
A.permanent partnership B.firm partnership
C.diverse relationship D.single relationship
58.According to the text, which of these women are married lastest?
A.Women from less educated background.
B.Women from poor rural areas.
C.Women from Islamic countries.
D.Wonf
eri from cities.
59.Child marriages are NOT related to ____ according to the passage.
A.social communication B.rural customs
C.poverty and lack of education D.religious beliefs
60.According to the passage, getting married early leads to all of the following EXCEPT____.
A.reducing a young woman's education
B.limiting a young woman's chances
C.causing baby death
D.doing harm to a young woman's health

Do you want to make a forceful and impressive public speech and become an eloquent (有口才的) speaker? The newly-published books in our bookstore help you realize your dream.Time waits for nobody.Take action! 20% discount on all the orders above $ 100.Here are introductions of these books.

10 Days to More Confldent Public Speaking.
By The Princeton Language Institute, Lenny Laskowski
Paperback: 224 page ISBN: 0446676683 Price: $20 per copy
THIS book is a course on giving publics talks.It was written by an expert in the field and has the tools to make you a relaxed effective and commanding public speaker.You can find clear, brief, step - by - step tips to help you.
●Overcome nervousness and discover your own natural style.
●Set up an immediate connection with your audience.
●Mix together humour and anecdotes (奇闻) into your talk.


In the Spotlight: Overcome Your Fear of Public Speaking and Performing;
By Janet E.Espostio Paperback: 176 page
Publisher:Strong Books ISBN: 1928782078 Price: $15 per copy
"IN the spotlight'' is a gift for people experiencing any degree of fear or discomfort in speaking and performingin front of others, either in formal or informal settings.The book has many different methods to help you get beyond stage rright and learn to speak or perform with ease and confidence.
The Lost Art of the Great Speech: How to Write One and How to Deliver it.
By Richard Dowis.Paperback : 288 pages.ISBN: 0814470548
Publisher: American Management Association.Price: $30 per copy Here's expert guidance on how to write a forceful speech.Attractive slides, confident body language, and a lot of eye contact are fine.Now everyone can learn to give powerful, direct speeches that catch audience' s attention.The key is not just in the delivery, but in using the power of language.It' s a speech - writing guide made by an award winning writer.It has everything from researching and writing the speech to preparing the next to delivering the speech to handling questions from audience.


Lend Me Your Ears: Great Speech in History.
By William Saftre Hardcover: 1055 pages ISBN: 0393040054
Publisher: W.W.Norton & Company. Pice: $ 50 per copy.
THIS is a collection of more than100 speeches that seeks to show the enduring power of human eloquence to inspire and uplift.These speeches are said to have moved millions of people and changed history.There is an introduction to each speech and essay on the art of public speaking.The collection is edited by former presidential speech writer William Safire.He knows firsthand the importance of putting together the right words for the right moment.

53.Suppose you want to buy each of the four books in the bookstore, you will at least have to pay .
A.$115 P.$23 C.$92 D.$85
54.Which of the four books mainly deals with the use of the language in a speech?
A.Lend Me Your Ears: Great Speech in History.
B.The Lost Art of the Great Speech; How to Write One and How to Deliver it.
C.In the Spotnight: Overcome Your Fear of Public Speaking and Performing.
D.10 Days to More Confident Public Speaking.
55.Which of the authors of the books used to write speeches for presidents?
A.Richard Dowis B.Janet, E.Esposito
C.Lenny Laskowski D.William Safire
56.The common purpose of the above books is to____.
A.give encouragement in making a speech
B.tell readers how to make a forcefuLand impresive speech
C.show readers the skills of writing a good speech
D.tell readers how to get over stage fright and to speak easily and confidently

According to the report by Baekeland and Hartmann, two American authoritative psychotogical research centres, the "short sleepers" had been more or less average in their sleep needs until the men were in their teens.But at about age 15 or so, the men voluntarily began cutting down their nightly sleep time because of pressures from school, work and other activities. These men tended to view their nightly periods of unconsciousness as bothersome interruptions, in their daily routines.
In general, these "short sleeps" appeared ambitious, active, energetic, cheerful,, conformist (循规蹈矩的) in their opinions, and very sure about their career choices.They often held several jobs at once, or workers full - or part - time while going to school.And many of them had a strong urge to appear "normal" or "acceptable" to their friends and associates.When asked to recall their dreams, the "short sleepers" did poorly.More than this, they seemed to prefer not remembering.In similar fashion, their usual way of dealing with psychological problems was to deny that the problem existed, and then to keep busy m the hope that the trouble would go away.The sleep patterns of the “short sleepers" were similar to, but less extreme than, sleep patterns shown by many mental patients categorized as manic (疯人).
The "long sleepers" were quite different indeed.Baekeland and Hartmann report that these young men had been lengthy sleeps since childhood.They seemed to enjoy their sleep, protected it, and were quite concerned when they were occasionally deprived (剥夺) of their desired 9 hours of nightly bed rest.They tended to recall their dreams much better than the "short sleepers." did.Many of the "long sleepers" were shy, anxious, introverted (内向), inhibited (压抑) , passive, mildly depressed, and unsure of themselves (particularly in social situations).Several openly states that sleep was an escape from their daily problems.
50.According to the text, which is probably the writer' s real attitude towards these two living habits ____.
A.both of them are healthy habits
B.not both of them are unhealthy habits
C.either of them is not unhealthy habits
D.neither of them is healthy habits
51.When sometimes they cannot enjoy adequate sleep, the long sleepers might ____.
A.feel extremely depressed B.become energetic
C.appeared disturbed D.feel disappointed
52.The writer implies (暗示) that short sleepers _____ in the text.
A.are ideally vigorous even under the pressures of life
B.often neglect the consequences of inadequate(不足的)sleep
C.do not know how to relax properly
D.are more unlikely to run into mental problems

After finishing my shopping, I headed for the checkout
counter but was blocked in the narrow passage by a young
man that appeared to be about sixteen years old. I wasn’t in a
hurry, so I patiently waited for the boy to realize that I was
there.
After a little while, he waved his hands excitedly, in the air and shouted in a loud voice, "Mommy, I'm here.Mommy, I'm here." It was obvious now, he was mentally challenged.Suddenly, he turned and saw me standing so close to him.His eyes widened and watched me surprisingly.He turned and saw me standing so close to him. His eyes widened and watched me surprisingly. I stepped back and asked, " Hey, buddy, what’s your name? " " My name is Denny and I'm shopping with my mother," he responded proudly."Wow," I said, "that's a cool name.I wish my name was Denny, but my name is Hal." "Hal like Halloween?" he asked."Yes," I answered."How old are you, Denny?" "How old am I now.Mommy?" he asked his mother as she came over from the next passage."You' re fifteen years old, Denny; now be a good boy and let the lady pass by." I continued to talk to Denny for several more minutes about summer vacation, bicycles and school.I watched his brown eyes dance with excitement.
As we were talking, he suddenly ran toward the toy section.
Denny's mom thanked me for taking the time to talk with her son.She told me that most people wouldn' t even look at him, much less talk to him…I told her that it was my pleasure and then I said, " Denny is a blue rose and if I didn' t stop and smell that rose with my heart, I would miss a blessing from God."
She looked more puzzled.I told her that there are plenty of red, yellow and pink roses in God's garden, however, blue roses are very rare and should be appreciated for their beauty and distinctiveness (特殊之处).Denny is such a "blue rose" in God's garden.
46.The story may happen.
A.in a school B.during the summer vacation
C.in a super market D.in the toy section
47.The boy's brown eyes dance with excitement because.
A.he was the center of someone's attention
B.Denny is a cool name
C.he is shopping with his mother
D.he likes summer vacation
48.We can infer from the passage that Danny ______.
A.was mentally challenged B.is 15 years old
C.was often very lonely and neglected D.is a ‘blue rose1’ in God's garden
49.From the passage we can learn that _______.
A.there are plenty of red, yellow and pink roses in God’s garden
B.blue roses'are very rare and should be appreciated
C.most people wouldn’t even look at Denny
D.every person should be appreciated in our life

Let children learn to judge their own work.A child learning to talk does not learn by being corrected all the time: if corrected too much, he will stop talking.He notices a thousand times a day the difference between the language he uses and the language those around him use.Bit by bit, he makes the necessary changes to make his language like other people’s.In the same way, children learning to do all the other things: they learn to do without being taught to walk, run, climb, whistle, ride a bicycle, compare their own performances with those of more skilled people, and slowly make the needed changes.But in school we never give a child a chance to find out his mistakes and correct them for himself.We do it all for him.We act as if we thought that he would never notice a mistake unless it was pointed out to him, or correct it unless he was made to.Let him work out, with the help of other children if he wants it, what this word says, what the answer is to that problem, whether this is a good way of saying or doing this or not.
If it is a matter of right answer, as it may be in mathematics or science, give him the answer book.Let him correct his own papers.Why should we teachers waste time on such routine work? Our job should be to help the child when he tells us that he can’t find the way to get the right answer.Let the children learn what all educated persons must some day learn, how to measure their own understanding, and how to know what they know or do not know.
According to the passage, the best way for children to learn things is by _____.

A.listening to skilled people’s advice
B.asking older people many questions
C.making mistakes and having them corrected
D.doing what other people do

Which of the following does the writer think teachers should NOT do?

A.Give children correct answers.
B.Allow children to make mistakes.
C.Point out children’s mistakes to them.
D.Let children mark their own work.

According to the writer, teachers in school should ________.

A.allow children to learn from each other
B.point out children’s mistakes whenever found
C.give children more book knowledge
D.correct children’s mistakes as soon as possible

The passage suggests that learning to speak and learning to ride a bicycle are ________.

A.different from learning other skills
B.the same as learning skills
C.more important than other skills
D.not really important skills

Copyright ©2020-2025 优题课 youtike.com 版权所有

粤ICP备20024846号