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 down 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 be used in hospitals to operate heart pacemakers(起搏器). 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 shou1d be ready in one year.
The developers hope the device will one day help developing countries. Near1y 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 wa1king.
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
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 wa1k 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 medicine to operate heart pacemakers
A．First device powered by walking wi1l 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
In every cultivated language there are two great classes of words which, taken together, comprise the whole vocabulary.First, there are those words 1 which we become acquainted in daily conversation, which we 2 ,that is to say, from the 3 of our own family and from our familiar associates, and 4 we should know and use 5 we could not read or write.They 6 the common things of life, and are the stock in trade of all who 7 the language.Such words may be called“popular”, since they belong to the people 8 and are not the exclusive 9 of a limited class.On the other hand, our language 10 a multitude of words which are comparatively 11 used in ordinary conversation.Their meanings are known to every educated person, but there is little 12 to use them at home or in the market-place.Our 13 acquaintance with them comes not from our mother's 14 or from the talk of our school-mates, 15 from books that we read, lectures that we 16 ,or the more 17 conversation of highly educated speakers who are discussing some particular 18 in a style appropriately elevated above the habitual 19 of everyday life.Such words are called“learned”, and the 20 between them and the“popular”words is of great importance to a right understanding of linguistic process.
1.A.at B.with C.by D.through
2.A.study B.imitate C.stimulate D.learn
3.A.mates B.relatives C.members D.fellows
4.A.which B.that C.those D.ones
5.A.even B.despite C.even if D.in spite of
6.A.mind B.concern C.care D.involve
7.A.hire B.apply C.adopt D.use
8.A.in public B.at most C.at large D.at best
9.A.right B.privilege C.share D.possession
10.A.consists B.comprises C.constitutes D.composes
11.A.seldom B.much C.never D.often
12.A.prospect B.way C.reason D.necessity
13.A.primary B.first C.principal D.prior
14.A.tips B.mouth C.lips D.tongue
15.A.besides B.and C.or D.but
16.A.hear of B.attend C.hear from D.listen
17.A.former B.formula C.formal D.formative
18.A.theme B.topic C.idea D.point
19.A.border B.link C.degree D.extent
20.A.diversion B.distinction C.diversity D.similarity
Today the car is the most popular sort of transportation in all of the United States.It has completely 1 the horse as a 2 of everyday transportation.Americans use their car for 3 90% of all 4 business.Most Americans are able to 5 cars.The average price of a 6 made car was ,050 in 1950, ,470 in 1960 and up to ,750 7 1975.During this period American car manufacturers set about 8 their products and work efficiency.As aresult, the yearly income of the 9 family increased from 1950 to 1975 10 than the price of cars.For this reason 11 a new car takes a smaller 12 of a familys total earnings today.In 1951 13 it took 8.1 months of an average familys 14 to buy a new car.In 1962 a new car 15 8.3 of a familys annual earnings, by 1975 it only took 4.75 16 income.In addition, the 1975 cars were technically 17 to models from previous years.The 18 of automobile extends throughout the economy 19 the car is so important to American.Americans spend more money 20 keeping their cars running than on any other item.
1.A.denied B.reproduced C.replaced D.ridiculed
2.A.means B.mean C.types D.kinds
3.A.hardly B.nearly C.certainly D.somehow
4.A.personal B.personnel C.manual D.artificial
5.A.buy B.sell C.race D.see
6.A.quickly B.regularly C.rapidly D.recently
7.A.on B.in C.before D.after
8.A.raising B.making C.reducing D.improving
9.A.unusual B.smallest C.average D.biggest
10.A.slower B.equal C.faster D.less
11.A.bringing B.obtain C.bought D.purchasing
12.A.part B.half C.number D.quality
13.A.clearly B.proportionally C.percentage D.suddenly
14.A.income B.work C.plans D.debts
15.A.used B.spent C.cost D.needed
16.A.months B.years C.family D.year
17.A.famous B.superior C.fastest D.better
18.A.running B.notice C.influence D.affect
19.A.then B.as C.so D.which
20.A.to B.in C.of D.for
We have spoken of marriage as a formal contract.It should be noted, however, that this contract does not 1 the same form in different societies.In Western societies, the 2 of a man and a woman 3 given the status of legal marriage by being registered by an official 4 by the state.In some African so cieties, 5 , marriage has nothing to do 6 an official registration of this kind but is legalized by the formal 7 of goods.Generally 8 is the bridegroom who is required to make a 9 of goods to the bride's kin(亲戚), though sometimes a payment is 10 made by the bridegroom's kin to that of the bride.
Among the Nuer, a 11 living in Southern Sudan, the payment made to the bride's kin, 12 as bridewealth, is in the 13 of cattle.Once the 14 of bridewealth is agreed 15 , and the formal payment is made, the marriage becomes a 16 union and the offspring of the union become the acceptable 17 of the husband.They remain 18 children even 19 the wife subsequently leaves him to live with 20 man。
1.A.make B.get C.take D.do
2.A.condition B.difference C.union D.divorce
3.A.is B.are C.was D.were
4.A.recognizing B.recognize C.to recognize D.recognized
5.A.however B.yet C.though D.still
6.A.with B.from C.for D.to
7.A.exchange B.contact C.communication D.connection
8.A.that B.this C.one D.it
9.A.money B.payment C.cost D.consumption
10.A.also B.too C.either D.as well
11.A.a person B.a people C.a man D.a couple
12.A.called B.known C.named D.looked
13.A.shape B.size C.form D.type
14.A.amount B.number C.figure D.volume
15.A.upon B.with C.to D.for
16.A.legal B.casual C.direct D.progressive
17.A.bride B.cattle C.wealth D.children
18.A.his B.her C.their D.ones
19.A.before B.because C.while D.if
20.A.other B.another C.more D.farther
Many people wrongly believe that when people reach old age, their families place them in nursing homes.They are left in the 1 of strangers for the rest of their lives.Their 2 children visit them only occasionally, but more often, they do not have any 3 visitors.The truth is that this idea is an unfortunate myth-an 4 story.In fact, family members provide over 80 percent of the care 5 elderly people need.Samuel Prestoon, a sociologist, studied 6 the American family is changing.He reported that by the time the 7 American couple reaches 40 years of age, they have more parents than children. 8 , because people today live longer after an illness than people did years 9 , family members must provide long term care.More psychologists have found that all caregivers 10 a common characteristic: All caregivers believe that they are the best 11 for the job.In other words, they all felt that they 12 do the job better than anyone else.Social workers 13 caregivers to find out why they took 14 the responsibility of caring for an elderly relative.Many caregivers believed they had 15 to help their relative.Some stated that helping others 16 them feel more useful.Others hoped that by helping 17 now, they would deserve care when they became old and 18 .Caring for the elderlyand being taken care of can be a 19 satisfying experience for everyone who might be 20 .
1.A.hands B.arms C.bodies D.homes
2.A.growing B.grown C.being grown D.having grown
3.A.constant B.lasting C.regular D.normal
4.A.imaginary B.imaginable C.imaginative D.imagery
5.A.that B.this C.those D.these
6.A.when B.how C.what D.where
7.A.common B.ordinary C.standard D.average
8.A.Further B.However C.Moreover D.Whereas
9.A.before B.ago C.later D.lately
10.A.share B.enjoy C.divide D.consent
11.A.person B.people C.character D.man
12.A.would B.will C.could D.can
13.A.questioned B.interviewed C.inquired D.interrogate
14.A.in B.up C.on D.off
15.A.admiration B.initiative C.necessity D.obligation
16.A.cause B.enable C.make D.get
17.A.someone B.anyone C.everyone D.anybody
18.A.elderly B.dependent C.dependable D.independent
19.A.similarly B.differently C.mutually D.certainly
20.A.involved B.excluded C.included D.considered
完形填空（共20小题，每小题1.5分，共30分）
阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项。
James’s New Bicycle
James shook his money box again. Nothing! He carefully __36__ the coins that lay on the bed. $24.52 was all that he had. The bicycle he wanted was at least $90! __37__ on earth was he going to get the __38__ of the money?
He knew that his friends all had bicycles. It was __39__ to hang around with people when you were the only one without wheels. He thought about what he could do. There was no __40__ asking his parents, for he knew they had no money to __41__.
There was only one way to get money, and that was to __42__ it. He would have to find a job. __43__ who would hire him and what could he do? He decided to ask Mr. Clay for advice, who usually had __44__ on most things.
“Well, you can start right here,” said Mr. Clay. “My windows need cleaning and my car needs washing.”
That was the __45__ of James’s odd-job（零工） business. For three months he worked every day after finishing his homework. He was amazed by the __46__ of jobs that people found for him to do. He took dogs and babies for walks, cleared out cupboards, and mended books. He lost count of the __47__ of cars he washed and windows he cleaned, but the __48__ increased and he knew that he would soon have __49__ for the bicycle he longed for.
The day __50__ came when James counted his money and found $94.32. He __51__ no time and went down to the shop to pick up the bicycle he wanted. He rode __52__ home, looking forward to showing his new bicycle to his friends. It had been hard __53__ for the money, but James knew that he valued his bicycle far more __54__ he had bought it with his own money. He had __55__what he thought was impossible, and that was worth even more than the bicycle.
A．cleaned B．covered C．counted D．checked
A．How B．Why C．Who D．What
A．amount B．part C．sum D．rest
A．brave B．hard C．smart D．unfair
A．point B．reason C．result D．right
A．split B．spend C．spare D．save
A．borrow B．earn C．raise D．collect
A．Or B．So C．For D．But
A．decisions B．experience C．opinions D．knowledge
A．beginning B．introduction C．requirement D．opening
A．similarity B．quality C．suitability D．variety
A．brand B．number C．size D．type
A．effort B．pressure C．money D．trouble
A．all B．enough C．much D．some
A．finally B．instantly C．normally D．regularly
A．gave B．left C．took D．wasted
A．patiently B．proudly C．silently D．tiredly
A．applying B．asking C．looking D．working
A．since B．if C．than D．though
A．deserved B．benefited C．achieved D．learned