填空题 Every now and then a study comes along whose chief interest lies in how peculiarly askew its findings seem to be from the common perception of things. Sometimes, of course, the "surprising new study" itself turns out to be off in some way. But if the data are fundamentally sound, then what you really want to know is why sensible people hold such a contrary view. 41___________________. Researchers took a closer look at an earlier study that had been widely interpreted, when it was first published in 2000, as proof that the homework monster was growing, and insatiable. A Time magazine cover article spawned a minigenre of trend stories, all peopled by pale, exhausted kids and bewildered boomer parents whose own homework memories seemed to encompass only felt puppets and shoe-box dioramas. But the new report points out that while the amount of time schoolchildren 12 and under devoted to study at home did indeed grow between 1981 and 1997, the increase was small: an average of 23 minutes per week. 42___________________. So why do so many parents seem to think otherwise? One answer is that the real increase in homework that has been documented is among younger children. In 1981, for instance, one-third of 6- to 8-year-olds had some homework; one-half did in the late 90's. 43___________________. Since children 6 to 8 are the ones we particularly like to think of as engaged in unstructured play--we imagine them riding bikes in the honeyed light of waning afternoons, even when what they might well be doing, in the absence of homework, is watching TV-homework for them seems like one of those heavy-handed incursions on the freedom of childhood. 44___________________. These children go to elite private schools or to demanding public ones where the competitive pressures are such that they either really do have hours of homework each night or take hours finishing it because they (or their parents) are so anxious that it be done well. They come from the demographic that makes a cultural, almost a. moral, ideal of enrolling children in soccer and oboe lessons and karate and ballet, and so their time really is at a premium. 45___________________. A. Moreover, 20 percent fewer children between the ages of 9 and 12 were doing homework at all in 1997 than in 1981. And high-school students spent no more time on homework than they did in previous decades. B. That is certainly the question raised by a Brookings Institution report released last month showing that the amount of time kids devote to homework has not, in fact, significantly increased over the last two decades. C. Behind the seeming contradictions of steady homework levels and the anti-homework backlash, in other words, is the reality of social class. D. They are likely to have busy professional parents, oversubscribed themselves but with an investment in seeing their children produce book reports of a kind that teachers, counselors and, in time, college admissions boards will find impressive. E. Anti-homework crusades are not new-in 1901, for example, California passed a law abolishing homework for grades one through eight-but they have usually been led by the same kinds of people, which is to say, elites. F. Since parents are more likely to have to supervise a first or second grader doing homework than an older child, the earlier launching of a homework regimen might feel like a disproportionate increase in the parental workload. G. But the bigger answer, I suspect, is that the parents we tend to hear from in the press, at school-board meetings and in Internet chat groups, the parents with elaborated, developmentally savvy critiques of standards and curriculums, are parents whose children really are experiencing a time crunch.

填空题Most people would not object to living a few years longer than normal, as long as it meant they could live those years in good health. Sadly, the only proven way to extend the lifespan of an animal in this way is to reduce its calorie intake. Studies going back to the 1930s have shown that a considerable reduction in consumption ( about 50% ) can extend the lifespan of everything from dogs to nematode worms by between 30% and 70%. Although humans are neither dogs nor worms, a few people are willing to give the calorie-restricted diet a try in the hope that it might work for them, too. But not many--as the old joke has it, give up the things you enjoy and you may not live longer, but it will sure seem as if you did. Now, though, work done by Marc Hellerstein and his colleagues at the University of California, Berkeley, suggests that it may be possible to have, as it were, your cake and eat it too. Or, at least, to eat 95% of it. Their study, to be published in the American Journal of Physiology--Endocrinology and Metabolism, suggests that significant gains in longevity might be made by a mere 5% reduction in calorie intake. The study was done on mice rather than people. But the ubiquity of previous calorie-restriction results suggests the same outcome might well occur in other species, possibly including humans. However, you would have to fast on alternate days. (41) ______ Cancer is the uncontrolled growth of cells. For a cancer to develop efficiently, it needs multiple mutations to accumulate in the DNA of the cell that becomes the tumor's ancestor. (42) ______ A slower rate of cell division thus results in a slower accumulation of cancer-causing mutations. (43) ______ Heavy water is heavy because the hydrogen in it weighs twice as much as ordinary hydrogen (it has a proton and a neutron in its nucleus, instead of just a proton). Chemically, however, it behaves like its lighter relative. This means, among other things, that it gets incorporated into DNA as that molecule doubles in quantity during cell division. (44) ______ Dr Hellerstein first established how much mice eat if allowed to feed as much as they want. Then he set up a group of mice that were allowed to eat only 95% of that amount. In both cases, he used the heavy-water method to monitor cell division. The upshot was that the rate of division in the calorie-restricted mice was 37% lower than that in those mice that could eat as much as they wanted--which could have a significant effect on the accumulation of cancer-causing mutations. (45) ______[A] To stop this happening, cells have DNA-repair mechanisms. But if a cell divides before the damage is repaired, the chance of a successful repair is significantly reduced.[B] Bingeing and starving is how many animals tend to feed in the wild. The uncertain food supply means they regularly go through cycles of too much and too little food ( it also means that they are often restricted to eating less than they could manage if food were omnipresent).[C] But calorie-reduction is not all the mice had to endure. They were, in addition, fed only on alternate days: bingeing one day and starving the next. So, whether modern man and woman, constantly surrounded by food and advertisements for food, would really be able to forgo eating every other day is debatable.[D] Why caloric restriction extends the lifespan of any animal is unclear, but much of the smart money backs the idea that it slows down cell division by denying cells the resources they need to grow and proliferate. One consequence of that slow-down would be to hamper the development of cancerous tumors.[E] So, by putting heavy water in the diets of their mice, the researchers were able to measure how much DNA in the tissues of those animals had been made since the start of the experiment (and by inference how much cell division had taken place), by the simple expedient of extracting the DNA and weighing it.[F] The second reason, according to Elaine Hsieh, one of Dr Hellerstein's colleagues, is that cutting just a few calories overall, but feeding intermittently, may be a more feasible eating pattern for some people to maintain than making small reductions each and every day.[G] At least, that is the theory. Until now, though, no one has tested whether reduced calorie intake actually does result in slower cell division. Dr Hellerstein and his team were able to do so using heavy water as a chemical "marker" of the process.

填空题{{B}}Directions:{{/B}}You are going to read a list of headings and a text about happiness. Choose the most suitableheading from the list A-- F for each numbered paragraph (41--45). The first and last paragraphs of the text are not numbered. There is one extra heading which you do not need to use. Mark your answers on ANSWER SHEET 1. [A] Extensive applications of haptic technology.[B] Possibilities rendered by haptic mechanisms.[C] The feasibility of extending our senses and exploring abstract universes.[D] An example of the progress in science of haptics.[E] Bringing the potential of our senses into full play.[F] Will haptics step into a bright future? "OOOF!" Using your mouse, you heave a data file across the screen--a couple of gigabytes of data weigh a lot. Its rough surface tells you that it is a graphics file. Having tipped this huge pile of data into a hopper that sends it to the right program, you examine a screen image of the forest trail you'll be hiking on your Vacation. Then, using a gloved hand, you master its details by running your fingers over its forks and bends, its sharp rises and falls. Later you send an E-mail to your beloved, bending to the deskpad to attach a kiss. 41．______________ The science of haptics (from the Greek haptesthai, "to touch") is making these fantasies real. A few primitive devices are extending human-machine communication beyond vision and sound. Haptic joysticks and steering wheels for computer games are already giving happy players some of the sensations of piloting a spaceship, driving a racing car or firing weapons. In time, haptic interfaces may allow us to manipulate single molecules, feel clouds and galaxies, even reach into higher dimensions to grasp the subtle structures of mathematics. 42．______________ Most of our senses are passive. In hearing and vision, for example, the sound or light is simply received and analyzed. But touch is different: we actively explore and alter reality with our hands, so the same action that gathers information can also change the world--to model a piece of clay or press a button, for example. In providing direct contact between people, touch carries emotional impact. And in providing direct contact with the world, it is the sure sign of reality, as in "pinch me--am I dreaming?" 43．______________ Some small steps have even been taken towards whole-body haptics. Touch Technology of Nova Scotia, Canada, has built a haptic chair. It looks like a full length lounge chair in a family den, but its surface is studded with 72 "tactors" -pneumatic piston rods, covered with rounded buttons, that can extend about an inch, and can be driven under computer control in any desired sequence and pattern. It could be programmed to imitate a real massage or to function in time to music. According to the manufacturer, that provides a powerful blending of sen-sations--a long term goal of virtual reality. 44．______________ Even at its present crude level, however, haptics can make tangible what once could not be touched or even pictured. To investigate the world of the very small, researchers at the University of North Carolina, Chapel Hill, have developed the nanoManipulator. This adds touch to the technique of scanning probe microscopy, which can image a single atom by monitoring either the electrical current flowing between an extremely fine probe and a surface or the force between them. With the nanoManipulator, researchers can see and manipulate a universe a million times smaller than their own, to study viruses and tiny semiconducting devices. If the force feedback can be made sensitive enough, it may be possible to push molecular keys into specific molecular locks, to custom-design drugs or assemble silicon parts into intricate nanomachines. With other interfaces, there is no reason we shouldn't also be able to touch the very large-clouds, ocean currents, mantle flows, mountains, galaxy clusters. Or the very strong--with a suitable force scaling, new ceramics or alloys could be squeezed and twanged to test their engineering properties. Or the physically extreme and inaccessible--such as ultra hot plasma flows in fusion machines. 45．______________ Haptic technology could even make abstract ideas tangible. Many scientific concepts occupy spaces of more than three dimensions: string theory, for example, asserts that we live in a 10 or 11-dimensional Universe. As it is impossible to visualise such a space, we explore these ideas through mathematical expressions or two dimensional sketches on paper, But probing these unfamiliar geometries with touch may be more effective. And for blind people, haptics offers a new way to grasp information even in three dimensions. A group at the University of Delaware has developed an environment where a person can feel a mathematical function. Using a PHAN-TOM, the user "walks" along the surface of the figure. Like a hiker following mountainous terrain, the user feels where the function is steep, where it is level, and where its peaks and valleys lie. Other haptic systems could help blind people to browse the Internet, feeling images as well as words. The future of haptics is bright, but the only sensual relationship it will be sustaining any time soon is between you and your computer.

填空题A."Itisalwaysbettertobuyahouse;payingrentislikepouringmoneydownthedrain."Foryears,suchadvicehasencouragedpeopletoborrowheavilytogetonthepropertyladderassoonaspossible.Butisitstillsoundadvice?Housepricesarecurrentlyatrecordlevelsinrelationtorentsinmanypartsoftheworldanditnowoftenmakesmorefinancialsense—especiallyforfirst-timebuyers—torentinstead.B."IfIdon'tbuynow,I'llnevergetonthepropertyladder"isacommoncryfromfirst-timebuyers.Ifhousepricescontinuetooutpacewages,thatistrue.Butitnowlooksunlikely.Whenpricesgetoutoflinewithwhatfirst-timerscanafford,astheyaretoday,theyalwayseventuallyfallinrealterms.Themyththatbuyingisalwaysbetterthanrentinggrewoutofthehighinflationeraofthe1970sand1950s.First-timebuyersthenalwaysendedupbetteroffthanrenters,becauseinflationerodedtherealvalueofmortgagesevenwhileitpusheduprents.Mortgage-interesttaxreliefwasalsoworthmorewheninflation,andhencenominalinterestrates,washigh.Withinflationnowtamed,homeownershipisfarlessattractive.C.Homebuyerstendtounderestimatetheircosts.Oncemaintenancecosts,insuranceandpropertytaxesareaddedtomortgagepayments,totalannualoutgoingsnoweasilyexceedthecostofrentinganequivalentproperty,evenaftertakingaccountoftaxbreaks.Ah,butcapitalgainswillmorethanmakeupforthat,itispopularlyargued.Overthepastsevenyears,averagehousepricesinAmericahaverisenby65%,thoseinBritain,Spain,AustraliaandIrelandhavemorethandoubled.Butitisunrealistictoexpectsuchgainstocontinue.Makingthe(optimistic)assumptionthathousepricesinsteadriseinlinewithinflation,andincludingbuyingandsellingcosts,thenoveraperiodofsevenyears,—theaveragetimeAmericanownersstayinonehouse—ourcalculationsshowthatyouwouldgenerallybebetteroffrenting.D.Bewarned,ifyoumakesuchaboldclaimatadinnerparty,youwillimmediatelybesetupon.Payingrentisthrowingmoneyaway,itwillbeargued.Muchbettertospendthemoneyonamortgage,andbysodoingbuildupequity.Thesnagisthatthetypicalfirst-timebuyerkeepsahouseforlessthanfiveyears,andduringthattimemostmortgagepaymentsgooninterest,notonrepayingtheloan.Andifpricesfall,itcouldwipeoutyourequity.E.Inanycase,arentercanaccumulatewealthbyputtingthemoneysavedeachyearfromthelowercostofrentingintoshares.Thesehave,historically,yieldedahigherreturnthanhousing.Puttingallyourmoneyintoahousealsobreaksthebasicruleofprudentinvesting:diversify.Andyes,itistruethatamortgageleveragesthegainsonyourinitialdepositonahouse,butitalsoamplifiesyourlossesifhousepricesfall.F.Thedivergencebetweenrentsandhousepricesis,ofcourse,evidenceofahousingbubble.Somedaypriceswillfallrelativetorentsandwages.Aftertheydo,itwillmakesensetobuyahome.Untiltheydo,thesmartmoneyisonrenting.G."Iwanttohaveaplacetocallhome"isapopularretort.Rentingprovideslesslong-termsecurityandyoucannotpaintallthewallsorangeifyouwantto.Homeownershipisanexcellentpersonalgoal,butitmaynotalwaysmakefinancialsense.Theprideof"owning"yourownhomemayquicklyfadeifyouaresaddledwithamortgagethatcostsmuchmorethanrenting.Also,rentingdoeshavesomeadvantages.Rentersfinditeasiertomoveforjoborfamilyreasons.{{B}}Order:{{/B}}

填空题{{B}}Directions:{{/B}} You are going to read a list of headings and a text about what parents are supposed to do to guide their children into adulthood. Choose a heading from the list A—G that best fits the meaning of each numbered part of the text (41—45). The first and last paragraphs of the text are not numbered. There are two extra headings that you do net need to use. Mark your answers on ANSWER SHEET 1. (10 points) Glass, in one form or another, has long been in noble service to humans. As one of the most widely used of manufactured materials, and certainly the most versatile, it can be as imposing as a telescope mirror the width of a tennis court or as small and simple as a marble rolling across dirt. 41. ______ The uses of this adaptable material have been broadened dramatically by new technologies: glass fiber optics—more than eight million miles—carrying telephone and television signals across nations; glass ceramics serving as the nose cones of missiles and as crowns for teeth; tiny glass beads taking radiation doses inside the body to specific organs; even a new type of glass fashioned of nuclear waste in order to dispose of that unwanted material. 42. ______ On the horizon are optical computers. These could store programs and process information by means of light—pulses from tiny lasers—rather than electrons. And the pulses would travel over glass fibers, not copper wire. These machines could function hundreds of times faster than today's electronic computers and hold vastly more information. Today fiber optics are used to obtain a clearer image of smaller and smaller objects than ever before—even bacterial viruses. Anew generation of optical instruments is emerging that can provide detailed imaging of the inner workings of cells. It is the surge in fiber optic use and in liquid crystal displays that has set the U. S. glass industry (a 16 billion dollar business employing some 150, 000 workers) to building new plants to meet demand. 43. ______ But not all the glass technology that touches our lives is ultra-modem. Consider the simple light bulb; at the turn of the century most light bulbs were hand blown, and the cost of one was equivalent to half a day's pay for the average worker. In effect, the invention of the ribbon machine by Coming in the 1920s lighted a nation. The price of a bulb plunged. Small wonder that the machine has been called one of the great mechanical achievements of all time. Yet it is very simple: a narrow ribbon of molten glass travels over a moving belt of steel in which there are holes. The glass sags through the holes and into waiting moulds. Puffs of compressed air then shape the glass. In this way, the envelope of a light bulb is made by a single machine at the rate of 66,000 an hour, as compared with 1,200 a day produced by a team of four glassblowers. 44. ______ The secret of the versatility of glass lies in its interior structure. Although it is rigid, and thus like a solid, the atoms are arranged in a random disordered fashion, characteristic of a liquid. In the melting process, the atoms in the raw materials are disturbed from their normal position in the molecular structure; before they can find their way back to crystalline arrangements the glass cools. This looseness in molecular structure gives the material what engineers call tremendous "formability" which allows technicians to tailor glass to whatever they need. 45. ______ Today, scientists continue to experiment with new glass mixtures and building designers test their imaginations with applications of special types of glass. A London architect, Mike Davies, sees even more dramatic buildings using molecular chemistry. "Glass is the great building material of the future, the 'dynamic skin'," he said." Think of glass that has been treated to react to electric currents going through it, glass that will change from clear to opaque at the push of a button, that gives you instant curtains." Think of how the tall buildings in New York could perform a symphony of colours as the glass in them is made to change colours instantly. Glass as instant curtains is available now, but the cost is exorbitant. As for the glass changing colours instantly, that may come true. Mike Davies's vision may indeed be on the way to fulfillment. [A] What makes glass so adaptable [B] Architectural experiments with glass [C] Glass art galleries flourish [D] Exciting innovations in fiber optics [E] A former glass technology [F] New uses of glass

填空题A.Recentarchaeologicalresearchhasfocusedonaphenomenonbarelynoticedbefore:extensivepatchesofrichblacksoilfoundalongthebanksandonterracesaboveallmajorriversintheAmazon.Somecoveranareaofmanyacresandareupto6feetdeep.Theyarethoughttohaveformedovermanycenturiesastheaccumulatedproductoforganicremainsleftbynativesettlements.ThesesoilsareusuallyfilledwithfragmentsofbustedceramicsandarenowbeingstudiedforcluestotheriseoftropicalforestcivilizationsintheAmazonBasin.Localfarmersregardtheblacksoilsasa"giftfromthepast"becausetheyarenaturallyfertileandhavetheabilitytosupportawiderangeofcrops.B.Secondly,thereisatrulyimpressivediversityoflanguages,withseveralhundreddistincttonguesanddialects.ThisverbaldiversitymusthaveevolvedoverthousandsofyearsandimpliesanoccupationoftheAmazonbasinforatleast14,000years,afiguresupportedbyarchaeologicalevidence.TherockartintheAmazonBasinmaybeasoldashumanoccupationitself.Imagesarecarvedandpaintedonexposedrocknearrapidsandwaterfallswherefishingismostproductive,andincavesandrocksheltersclosetoarchaeologicalsites.C.Twofactorshavebeeninstrumentalinliftingtheveilofmisunderstanding.Firstisasurprisinglydiverserangeofceramicstyles.Recentresearchseemstoconfirmthatacreativeexplosionofstylesoccurredabout2,000yearsago.ArchaeologicaldigsinthehighestreachesoftheUpperAmazonhavedemonstratedtheexistenceofawidespreadstyleofpaintinglargewatertightjarsinboldblack,redandcreamdesigns.ThissamestylehasbeenfoundonanisleatthemouthoftheAmazon,andappearstohaveitsoriginswheretheAmazonmeetstheocean,laterspreadingacrossmuchoftheUpperAmazon.Thestyletranscendslocalandregionalculturesandpointstoconsiderableintercoursebetweensocietiesalongthevastrivernetwork.D.ThenativepeoplesoftheAmazoncannolongerbeseenasisolatedcommunitiesinthedepthsoftheforestordispersedalongrivers.Westillhavemuchtolearnabouttheirsocieties,buttherainforestshouldnolongerbeseenasanuntouched"paradise".E.AmongthemostexcitingdiscoveriesarefuneraljarsdatingtoA.D.1400-1700foundincavesandrocksheltersnearthemouthoftheAmazon.Thebonesofmen,womenandchildrenwerepreservedinindividuallydedicatedvessels.Itseemsthatthesiteswerevisitedregularlyovertheyearsandnewjarsaddedasfamilymembersexpired.Theseburialsreflectthefamilytiesofancientsettlementsandtheirnurturingoflinksbetweenthelivingandthedead.F.PopulationcollapseandmovementalongtheprincipalriversoftheAmazonsystemhavecontributedtoaveilofmisunderstandingthathaslongcoveredtheculturalachievementsoftropicalforestsocieties.Diffusebandshuntingdeepintheforestinterioreventuallycametobeseenasthetypicaltropicalforestadaptation.SomuchsothatwhenarchaeologicalstudiesbeganinearnestatthemouthoftheAmazoninthe1950s,scientistsarguedthatthesophisticatedculturetheywerediscoveringcouldnothaveoriginatedintheAmazonBasinitself,butmusthavebeenderivedfrommoreadvancedcultureselsewhere.Theyimaginedthetropicalforesttobean"imitationparadise"unabletosupportmuchbeyondasimplehunting-and-gatheringwayoflife.Thismistakenideahasexertedapersistentinfluenceeversince.G.ThefutureoftheAmazonBasinisnowasubjectoffiercedebate.Knowledgeaboutthepasthasavitalroletoplayinplanninganddecisionmakingforthefuture.Archaeologypointstosuccessfulmethodsforadaptingtotheforest,groundedinpracticalexpertiseandempiricalknowledgeofthelimitationsandpossibilitiesofthisenvironment.Thesetechniquesforwisemanagementarebecomingamatterofglobalconcern.{{B}}Order:{{/B}}

填空题Seismologist David Oppenheimer of" the U. S. Geological Survey Earthquakes Hazards Team explains (as told to Katherine Harmon) : Traditional geothermal drilling bores into hot rock such as sandstone that has water or steam trapped in its pore spaces and natural fractures. When a drilled hole intersects these fractures, the water flashes into steam because of the sudden drop in pressure-like bubbles that come out of a soda bottle when the cap is removed. The steam surges into the well hole, and the steam pressure at the surface spins a turbine to generate electricity. Sometimes the plant returns some of the water back into the reservoir to keep water levels up. The drilling itself does not cause earthquakes, but the steam removal and water return can do so, by producing new instability along fault or fracture lines. 1 ______________________ Researchers know they result from steam withdrawal or injection because when operators begin geothermal production in a new area, earthquakes begin and when production ends, the earthquakes stop. Many minor tremors occur, but quakes as large as magnitude 4.5 have been recorded. Residents of nearby Anderson Springs often feel tremors as small as magnitude 2.0 because the town sits only a couple of kilometers above the rock fractures. 2 ______________ When a large earthquake does occur, the public will ask whether the geothermal projects might have played a role in causing the rocks to shift along other faults. And researchers will have to use geodetic monitoring and other data to try to figure out whether it really was a factor in changing key stress dynamics. 3 ______________ Because the felsite has no natural pores, it also contains no water. To recover the heat, the project"s operators would have needed to fracture the rock and circulate water through it. First, in the short phase of the project, they would have drilled into the felsite and injected water to fracture the rock, most likely generating earthquakes in the process. Then, aided by borehole cameras revealing in which direction the fractures formed, they would have drilled a second hole to intersect the new fractures and would have produced steam by pumping water through the hot fractures linking the wells. This dry-rock geothermal approach has the potential to harness much more heat than the traditional sandstone techniques, but it can also mean more earthquakes. 4 ______________. Unfortunately, areas that are less tectonically active also have less accessible subterranean heat sources. 5 ______________. [A] California, for example, has more heat (because of its location near tectonic plate margins) than, say, Texas. The whole country has some geothermal potential if we wanted to draw warmth for heating. But the resulting heat would not necessarily have the energy to spin large turbines for electricity generation. [B] At a long-term geothermal project in northern California known as the Geysers, the USGS has been monitoring seismic activity since 1975. Even though the area does not appear to have any large faults running through it, researchers record about 4,000 quakes above magnitude 1.0 every year. [C] All sources of energy-hydropower, nuclear, wind or coal—have advantages and disadvantages. Geothermal energy has the advantage of being clean and renewable, but earthquakes are a downside. [D] In addition to the traditional geothermal plants at the Geysers, a pilot project, which was suspended last September, intended to draw steam directly from the volcanic, nonporous rock called Msite that lies below the sandstone and is its heat source. [E] To control the earthquake risk, drillers would have tried to keep the size of the fractures small and to maintain steady water flow rates. The threshold goal for earthquakes is 2.0 or lower on the Richter scale. Such deep-drilling operations would not want a repeat of events in Basel, Switzerland, where a widely felt magnitude 3.4 quake in 2006 ultimately stopped a similar geothermal project. [F] Many researches have been finished during the past years, and the relationship between the earthquake and Geothermal energy has been proved, which orientated the direction to the use of Geothermal energy. [E] Geologists suspect that even larger earthquakes could occur on nearby faults such as the Maacama, which is adjacent to the Geysers fields. The extraction of water and heat from the porous sandstone causes it to contract, much as a sponge shrinks when it dries out.

填空题[A] Mobility of this kind meant also mobility of ideas, their transference across frontiers, and their simultaneous impact upon many groups of people. The point of learning is to share it, whether with students or with colleagues; one presumes that only eccentrics have no interest in being credited with a startling discovery, or a new technique. It must also have been reassuring to know that other people in other parts of the world were about to make the same discovery or were thinking along the same lines, and that one was not quite alone, confronted by inquisition, ridicule or neglect.[B] Scholars and students have always been great travelers. The case for “academic mobility” is now often stated in impressive terms as a fundamental necessity for economic and social progress in the world, but it is certainly nothing new. Serious students were always ready to go abroad in search of the most stimulating teachers and the most famous academies; in search of the purest philosophy, the most effective medicine, the likeliest road to gold.[C] Apart from the vehicle itself, it is fairly easy to identify the main factors which have brought about the recent explosion in academic movement. Some of these are purely quantitative and require no further mention: there are far more centers of learning, and a far greater number of scholars and students.[D] But as the specializations have increased in number and narrowed in range, there had been an opposite movement towards interdisciplinary Studies. These owe much to the belief that one cannot properly investigate the incredibly complex problems thrown up by the modern world, and by recent advances in our knowledge along the narrow front of a single discipline. This trend has led to a great deal Of academic contact between disciplines, and a far greater emphasis on the pooling of specialist knowledge, reflected in the broad subjects chosen in many international conferences.[E] Frequently these specializations lie in areas where very rapid developments are taking place, and also where the research needed for developments is extremely costly and takes a long time. It is precisely in these areas that the advantages of collaboration and sharing of expertise appear most evident. Associated with this is the growth of specialist periodicals, which enable scholars to become aware of what is happening in different centers of research and to meet each other in conferences and symposia. From these meetings come the personal relationships which are at, the bottom of almost all formalized schemes of cooperation, and provide them with their most satisfactory stimulus.[F] In the twentieth century, and particularly in the last 20 years, the old footpaths of the wandering scholars have become vast highways. The vehicle which has made this possible has of course been the aeroplane, making contact between scholars even in the most distant places immediately feasible, and providing for the very rapid transmission of knowledge.[G] In addition one must recognize the very considerable multiplication of disciplines, particularly in the sciences, which by widening the total area of advanced studies has produced an enormous number of specialists whose particular interests are precisely defined. These people would work in some isolation if they were not able to keep in touch with similar isolated groups in other countries. (作图)

填空题Your heart suddenly starts pounding so hard you think it's going to leap right out of your chest. You're sweating even though it's cold out. You feel unsteady on your feet and generally shaky, like the world around you is spinning out of control and you can't get a grip. Your hands and feet are numb and useless. You're gasping for breath and feel like you're drowning. (41)__________Genetics may be part of the explanation; women are more prone to anxiety or depression, and a history of these mood disorders makes you more likely to have a panic attack. But unhappy life experiences may also increase women's vulnerability. A particularly active area of research at the moment is the effect of hormones. Women seem most susceptible to panic attacks during times of hormonal changes, such as adolescence, pregnancy, and so on. Dr. Lilian Gonsalves, psychology at the Cleveland Clinic, says some scientists think that hormonal fluctuation may upset the balance of chemicals in the brain that modulate fear and anxiety, triggering a panic attack. It feels like the fight-or-flight response gone wild with no provocation. (42)__________ Fear of another attack often makes people avoid places where an attack took place, and a small percentage of sufferers may eventually become housebound, a condition called agoraphobia. (43)__________ "We used to say that you don't die of a panic attack, but I've stopped saying that," says Gonsalves. "It could be that during a panic attack you get coronary spasms or an irregular heart rate. " (44)__________There's no single cure that works for everyone, but generally, patients use medication, cognitive behavioral therapy or some combination of the two. Cognitive behavioral therapy teaches you a range of techniques—such as relaxation exercises—to deal with everyday anxiety and stress, lessening the chances of another attack. Many people find that drugs help control the problem until they can find a behavioral therapy that works, after which drugs may no longer be necessary. Research has also shown that regular exercise.and activities such as yoga may reduce the severity and number of attacks. (45)__________If there is nothing wrong, then your doctor will probably refer you to a psychiatrist or psychologist who can work with you on the problem over what may be a period of several months. It takes a while to feel completely better; generally, antidepressants start working in six to eight weeks, Gonsalves says. But many patients begin to get some relief in just two weeks, she adds. In all, about 80 percent of patients will do well. In the case of the other 20 percent, who don't respond to treatment, doctors often find that they have missed an underlying medical condition that is behind the attacks.[A] Suffering from frequent panic attacks also means you are at higher risk of depression, substance abuse and suicide. Some research also indicates that women who have repeated attacks are at higher risk of death.[B] Call your doctor even if you've had only a single attack, because these symptoms could also signal a wide range of other problems, including thyroid and heart disease. A primary-care physician will first perform a physical exam and probably order an EKG and blood tests to rule out other possible causes of the attacks.[C] You can be standing at a bus stop or shopping at the mall without any danger in sight, and suddenly, you feel like you're dying. The attack is generally over in a few minutes, but sometimes symptoms—especially feeling faint and dizzy—can linger for mare than an hour.[D] Many women report experiencing their first panic attack in late adolescence. But others have no trouble until they are around 50, when their hormone levels often vary wildly. "These are high functioning women who have never seen a psychiatrist before," says Gonsalves. "They start having hot flashes and they don't sleep. They become acutely anxious. "[E] If you have felt all of these come on without warning, you may have just suffered a panic attack. These frightening symptoms affect women twice as often as men, although scientists are not sure why.[F] The cure of panic attacks often depends on the cause. If your attacks are triggered by a physical condition, they should be eliminated by treating the physical cause. If you can't find the cause, continue looking and using the above tips to control the attacks.[G] Because of the possible consequences of untreated panic attacks, it's important to get help early. And fortunately, there is lot of help available.