最新全国职称英语考试 理工类 完型填空(完形填空) 15篇全 三栏版知识点复习考点归纳总结

第一篇Captain Cook Arrow Legend It was a great legend while it lasted，but DNA testing has (1) finally ended a two-century-old story of the Hawaiian arrow carved from the bone of British explorer Captain James Cook(2) who died in the Sandwich Islands’in 1779.“There is (3) no Cook in the Australian Museum，’’museum collection manager Jude Philip said not long ago in announcing the DNA evidence that the arrow w as not made of Cook’S bone.But that will not stop the museum from continuing to display the arrow in its(4) exhibition，“Uncovered：Treasures of the Australian Museum,” which(5) does include a feather cape presented to Cook by Hawaiian King Kalani’opu’u in 1778.Cook was one of Britain’s great explorers and is credited with(6) discovering the“Great South Land，"(7) now Australia, in 1 770.He was clubbed to death in the Sandwich Islands，now Hawaii。

The 1egend of Cook’s arrow began in 1824 (8) when Hawaiian King Kamehameha on his deathbed gave the arrow to William Adams，a London surgeonand rela tive of Cook’s wife，saying it was made of Cook’s bone after the fatal(9) fight with islanders.In the 1890s the arrow was given to the Australian Museum and the legend continued (10) until it came face=to-face with science.DNA testing by laboratories in Australia and New Zealand revealed the arrow was not made of Cook’s bone but was more (11) likely made of animal bone。

said Philp.However, Cook’s fans(12) refuse to give up hope that one Cook legend will prove true and that part of his remains will still be uncovered.as they say there is evidence not a11 of Cook’s body was (13) buried at sea in 1 779.“On this occasion technology has won"，”saidCliff Thornton，president of the Captain Cook Society,in a (14) statement from Britain.“But I am (15) sure that one of these day s…one of the Cook legends will prove to be true and it will happen one day.’’第二篇Avalanche and Its SafetyAn avalanche is a sudden and rapid flow of snow, often mixed with air and water, down a mountainside. Avalanches are (1) among the biggest dangers in the mountains for both life and property.All avalanches are caused by an over-burden of material, typically snowpack, that is too massive and unstable for the slope (2) that supports it. Determining the critical load, the amount of over-burden which is (3)likely to cause an avalanche, (4)is a complex task involving the evaluation of a number of factors.Terrain slopes flatter than 25 degrees or steeper than 60 degrees typically have a low (5)risk of avalanche. Snow does not (6)gather significantly on steep slopes; also, snow does not (7)flow easily on flat slopes. Human-triggered avalanches have the greatest incidence when the snow's angle of rest is (8)between 35 and 45 degrees; the critical angle, the angle at which the human incidence of avalanches is greatest, is 38 degrees. The rule of thumb is: A slope that is (9)flat enough to hold snow but steep enough to ski has the potential to generate an avalanche, regardless of the angle. Additionally, avalanche risk increases with (10) use ; that is, the more a slope is disturbed by skiers, the more likely it is that an avalanche will occur.Due to the complexity of the subject, winter travelling in the backcountry is never 100% safe. Good avalanche safety is a continuous (11)process , including route selection and examination of the snowpack, weather (12)conditions, and human factors. Several well-known good habits can also(13) reduce the risk. If local authorities issue avalanche risk reports, they should be considered and all warnings should be paid (14)attention to. Never follow in the tracks of others without your own evaluations; snow conditions are almost certain to have changed since they were made. Observe the terrain and note obvious avalanche paths where plants are （15）missing or damaged. Avoidtraveling below others who might trigger an avalanche.第三篇Giant Structures （2018年已考）It is an impossible task to select the most amazing wonders of the modem world since every year more__1_wonderful_ constructions appear. Here are three giant structures which are worthy of our__2admiration__ although they may have been surpassed by some more recent wonders.The Petronas Twin TowersThe Petronas Towers were the tallest buildings in the world when they were completed in 1999. With a__3height__ of 452 metres, the tall twin towers, like two thin pencils, dominate the city of Kuala Lumpur. At the 41st floor, the towers are linked by a bridge, symbolizing a gateway to the city. The American__4architct__ Cesar Pelli designed the skyscrapers. Constructed of high-strength concrete, the building provides around 1，800 square metres of office space __5_on_ every floor. And it has a shopping centre and a concert hall at the base. Other __6_features_ of this impressive building include double-decker lifts, and glass and steel sunshades.The MiUau BridgeThe Millau Bridge was opened in 2004 in the Tam Valley，in southern France. __7at__ the time it was built，it was the world’s highest bridge, __8resching__ over 340m at the highest point. The bridge is described as one of the most amazingly beautiful bridges in the world. It was built to __9_relieve_ Millau's congestion problems. The congestion was then caused by traffic passing from Paris to Barcelona in Spain. The bridge was built to withstand the __10_most_ extreme seismic and climatic conditions. Besides, it is guaranteed for 120 years!The Itaipu DamThe Itaipu hydroelectric power plant is one of the largest constructions of its kind in the world. It consists of a series of dams across the River Parana, __11which__ forms a natural border between Brazil and Paraguay. Started in 1975 and taking 16 years to complete, the construction was carried out as a joint project between the two __12countries__. The dam is well-known forboth its electricity output and its size. In 1995 it produced 78% of Paraguay’s and 25% of Brazil’s__13_energy_ needs. In its construction, the__14amount__ of iron and steel used was equivalent to over 300 Eiffel Towers. It is a __15truly__ amazing wonder of engineering.第四篇Animal’s “Sixth Sense”A tsunami was triggered by an earthquake in the Indian Ocean in December, 2004. It killed tens of thousands of people in Asia and East Africa. Wild animals, （1）however, seem to have escaped that terrible tsunami. This phenomenon adds weight to notions that I they possess a “sixth sense” for （2）disasters, experts said.Sri Lankan wildlife officials have said the giant waves that killed over 24,000 people along the Indian Ocean island’s coast clearly （3）missed wild beasts, with no dead animals found.“No elephants are dead, not （4）even dead rabbit. I think animals can （5）sense disaster. They have a sixthsense. They know when things are happening.” H.D. Ratnayake, deputy director of Sri Lanka’s Wildlife Department, said about one month after the tsunamiattack. The （6）waves washed floodwaters up to 2 milesinland at Yala National Park in the ravaged southeast,Sri Lanka’s biggest wildlife （7）reserve and home tohundreds of wild elephants and several leopards.“There ha s been a lot of （8）apparent evidenceabout dogs barking or birds migrating before volcanic eruptions or earthquakes. But it has not been proven,” said Matthew van Lierop an animal behavior（9）specialist at Johannesburg Zoo.“There have been no （10）specific studiesbecause you can’t really test it in a lab or field setting2,” he told Reuters. Other authorities concurred with this （11）assessment.“Wildlife seem to be able to pick up certain （12）phenomenon, especially birds… there are many reports of b irds detecting impending disasters,” said Clive Walker, who has written several books on African wildlife.Animals （13）certainly rely on the known sensessuch as smell or hearing to avoid danger such as predators.The notion of an animal “sixth sense”-or （14）some other mythical power-is an enduring one3 which the evidence on Sri Lanka’s ravaged coast is likely to add to.The Romans saw owls （15）as omens of impendingdisaster and many ancient cultures viewed elephants as sacred animals endowed with special powers or attributes.第五篇Singing Alarms Could Save the BlindIf you cannot see, you may not be able to find your way out of a burning building ---- and that could be fatal. A company in Leeds could change all that （1）with directional sound alarms capable if guiding you to the exit.Sound Alert, a company （2）run by the University of Leeds, is installing the alarms in a residential home for （3）blind people in Sommerset and a resource centre for the blind in Cumbria.（4）The alarms produce a wide range of frequencies that enable the brain to determine where the （5）sound is coming from.Deborah Withington of Sound Alert says that the alarms use most of the frequencies that can be （6）heard by humans. “It’s a burst of white noise （7）that people say sounds like static on the radio,”she says. “Its life-saving potential is great.”She conducted an experiment in which people were filmed by thermal—imaging cameras trying to find their way out of a large （8）smoke-filled room. It （9）took them nearly four minutes to find the door （10）without a sound alarm, but only 15 seconds with one.Withington studies how the brain （11）processes sounds at the university. She says that the （12）source of a wide band of frequencies can be pinpointed more easily than the source of a narrow band. Alarms （13）based on the same concept have already been installed on emergency vehicles.The alarms will also include rising or falling frequencies to indicate whether people should go up （14）or down stairs. They were（15）developed with the aid of a large grant from British Nuclear Fuels.第六篇Car Thieves could Be Stopped RemotelySpeeding off in a stolen car, the thief thinks he has got a great catch. But he is in a nasty surprise. The car is fitted with a remote immobilizer and a radio signal from a control center miles away will ensure that once the thief switches the engine 1off , he will not be able to start it again.For now, such devices 2 are only available for fleets of trucks and specialist vehicles used on construction sites. But remote immobilization technology could soon start to trickle down to ordinary cars, and 3should be available to ordinary cars in the UK 4in two months.The idea goes like this. A control box fitted to the carincorporates5a miniature cellphone, a microprocessor and memory, and a GPS satellite positioning receiver. 6If the car is stolen, a coded cellphone signal will tell the unit to block the vehicle’s engine management system and prevent the engine7 being restarted.There are even plans for immobilizers 8that shut down vehicles on the move, though there are fears over the safety implications of such a system.In the UK. an array of technical fixes is already making 9 life harder for car thieves. “The pattern of vehicles crime has changed,” says Martyn Randall of Thatcham, a security research organization based in Berkshire that is funded in part 10 by the motor insurance industry.He says it would only take him a few minutes to 11 teach a novice how to steal a car, using a bare minimum of tools. But only if the car is more than 10 years old.Modern cars are a far tougher proposition, as their engine management computer will not 12allow them to start unless they receive a unique ID code beamed out by the ignition key. In the UK, technologies like this 13 have helped achieve a 31 per cent drop in vehicle-related crime since 1997.But determined criminals are still managing to find other ways to steal cars. Often by getting hold of the owner’s keys in a burglary. In 2000, 12 per cent of vehicles stolen in the UK were taken using the owner’s keys double the previous year’s figure.Remote-controlled immobilization system would 14put a major new obstacle in the criminal’s way by making such thefts pointless. A group that includes Thatcham, the police, insurance companies and security technology firms have developed standards for a system that could goon the market sooner than the 15customer expects.第七篇An intelligent carDriving needs sharp eyes, keen ears, quick brain, and coordination between hands and the brain. Many human drivers have all (1) these and can control a fast-moving car. But how does an intelligent car control itself?There is a virtual driver in the smart car. This virtual driver has “eyes,”“brains”，“hands” and “feet”，too. The mini-cameras (2) on each side of the car are his “eyes,” which observe the road and conditions ahead of it. They watch the (3) traffic to the car’s left and right. There is also a highly (4) automatic driving system in the car. It is the built-in computer, which is the virtual driver’s “brain. ” His “brain” calculates the speeds of (5) other moving cars near it and analyzes their positions. Basing on this information, it chooses the right (6) pathfor the intelligent cars, and gives (7) instructions to the “hands”and “feets”to act accordingly. In this way, the virtual driver controls his car.What is the virtual driver’s best advantage? He reacts (8)quickly. The mini-cameras are (9)sending images continuously to the “brain”. It (10)completes the processing of the images within 100 milliseconds. However, the world’s best drier (11) at least needs one second to react. (12) Besides, when he takes action, he needs one more second.The virtual driver is really wonderful. He can reduce the accident (13)rate considerably on expressway. In this case. Can we let him have the wheel at any time and in any place? Experts (14) warn that we cannot do that just yet. His ability to recognize things is still (15) limited. He can now only drive an intelligent car on expressways.第八篇Why India Needs Its Dying Vultures （2018年已考）The vultures in question may look ugly and threatening, but the sudden sharp __1decline__ in three species of India’s vultures is producing alarm rather than celebration, and it presents the world with a new kind of environmental __2_problemb_ The dramatic decline in vulture numbers is causing widespread disruption to people living in the same areas as the __3birds__ . It is also causing serious public health problems __4_across_ the Indian sub-continent.While their reputation and appearance may be unpleasant to many Indians，vultures have__5long__played a very important role in keeping towns and villages all over India clean. It is__6_because_they feed on dead cows. In India, cows are sacred animals and are __7_traditionallt_ left in the open when they die in their thousands upon thousands every year.The disappearance of the vultures has __8_led to_ an explosion in the numbers of wild dogs feeding on the remains of these dead animals. There are fears that rabies may __9_increase_ as a result. And this terrifying disease may ultimately affect humans in the region, since wild dogs are its main carriers. Rabies could also spread to other animal species, causing an even greaterproblem in the __10_future_.The need for action is __11_urgent_, so an emergency project has been launched to __12_find_ a solution to this serious vulture problem. Scientists are trying toidentify the disease causing the birds，deaths and, ifpossible, develop a cure.Large-scale vulture __13_deaths_ were first noticed at the end of the 1980s in India. A population survey at that time showed that the three species of vultures had declined __14_by_ over 90 per cent. All three species are now listed as “critically endangered”. As most vultures lay only single eggs and __15_take_ about five years to reach maturity, reversing their population decline will be a long and difficult exercise.第九篇Wonder WebsSpider webs are more than homes, and they are i ngenious traps. And the world’s best web spinner may be the Golden Orb Weaver spider. The female Orb Weaver spins a web of fibers thin enough to be invisible to insect prey, yet (1)tough enough to snare a flying bird without breaking.The secret of th e web’s strength? A type of super-resilient (2)silk called dragline. When the female spider is ready to (3)weave the web’s spokes and frame, she uses her legs to draw the airy thread out through a hollow nozzle in her belly. Dragline is not sticky, so the spider can race back and forth along (4)it to spin the web’s trademark spiral.Unlike some spiders that weave a new web every day, a Golden Orb Weaver (5)reuses her handiwork until it falls apart, sometimes not for two years. The silky thread is five times stronger than steel by weight and absorbs the force of an impact three times better than Kevlar, a high-strength human-made (6)material used in bullet-proof vests. And thanks to its high tensile strength, or the ability to resist breaking under the pulling force called tension, a single strand can stretch up to 40 percent longer than its original (7)length and snap back as well as new. No human-made fiber even comes (8)close .It is no (9)wonder manufacturers are clamoring for spider silk. In the consumer pipeline: High-performance fabrics for athletes and stockings that never run. Think parachute cords and suspension bridgecables. A steady (10)supply of spider silk would be worth billions of dollars –but how to produce it? Harvesting silk on spider farms does not (11)work because the territorial arthropods have a tendency to devour their neighbors.Now, scientists at the biotechnology company Nexia are spinning artificial silk modeled after Golden Orb dragline. The (12)first step: extract silk-making genes from the spiders. Next, implant the genes into goat egg cells. The nanny goats that grow from the eggs secrete dragline silk proteins in their (13)milk . “The young goats pass on the silk-making gene without (14)any help from us,” says Nexia president Jeffrey Turner. Nexia is still perfecting the spinning process, but they hope artificial spider silk will soon be snagging customers (15)as fast as the real thing snags bugs.第十篇Chicken Soup for the Soul：Comfort Food Fights LonelinessMashed potatoes, macaroni and cheese, may be bad for your arteries．1 but according to a study in Psychological Science, they’re good for your heart and 2emotions．The study focuses on “comfort food” andhow it makes people feel．"For me 3 personally ,food has always played a big role in my family,” says Jordan Troisi, a graduate student at the University of Buffalo, and lead author on the study．The study came out of the research programof his co—author Shira Gabriel．It has 4looked at non-human things that may affect human emotions．Some people reduce loneliness by bonding with their 5favorite TV show, building virtual relationships with a pop song singer or looking at pictures of loved ones．Troisi and Gabriel wondered if comfort food could have the same effect 6 by making people think of their nearest and dearest.In one experiment, in order to make 7 participants feel lonely, the researchers had them write for six minutes about a fight with someone close tothem．Others were given an emotionally neutral writing assignment. Then, some people in each 8group wrote about the experience of eating a comfort food and others wrote about eating a new food．9 Finally,the researchers had participants 10 complete questions about their levels of loneliness．Writing about a fight with a close person made people feel lonely．But people who were generally 11secure in their relationships would feel less lonely by writing about a comfort food．"We have found that comfort foods are consistently associated with those close to us．"says Troisi．"Thinking about or consuming these foods later then serves as a reminder of those close others．"In 12their essays on comfort food, many people wrote about the 13 experience of eating food with family and friends.In another experiment, 14eating chicken soup in the lab made people think more about relationships, but only if they considered chicken soup to be a comfortfood．This was a question they had been asked longbefore the experiment, along with many other questions, so t hey wouldn’t remember it.Throughout everyone’s daily lives they experience stress, often associated with our 15connections with others," Troisi says．"Comfort foodCan be an easy remedy for loneliness．第十一篇Climate Change Poses Major Risks for Unprepared Cities（2012年已考）A new examination of urban policies hasbeen 1carried out recently by Patricia Romero Lankao．She is a sociologist specializing in climate change and 2 urban development．She warns that manyof the world’s fast-growing urban areas，especially in developing countries．will likely suffer from the impacts of changing climate．Her work also concludes that most cities are failing to 3reduce emissions of carbon dioxide and other greenhouse 4 gases．These gases are known to affect the atmosphere．”Climate change is a deeply local issue and poses profound threats to the growing cities of the world,” says Romero Lankao. ”But too few cities are developing effective strategies to5protect their residents."Cities are 6 major sources of greenhouse gases．And urban populations are likely to be among those most severely affected by future climate change. Lankao’s findings highlight ways in whichcity-residents are particularly vulnerable, and suggest policy interventions that could offer immediate and longer-term 7 benefits ．The locations and dense construction patterns of cities often place their populations at greater risk for natural disasters. Potential 8threats associated with climate include storm surges and prolonged hot weather. Storm surges can flood coastal areas and prolonged hot weather can heat 9 heavily paved cities more than surrounding areas．The impacts of such natural eventscan be more serious in an urban environment．Forexample，a prolonged heat wave can increaseexisting levels of air pollution，causing widespreadhealth problems．Poorer neighborhoodsthat may 10lack basic facilities such as drinking water or a dependable network of roads，are especially vulnerable to natural disasters．Many residents in poorer countries live in substandard housing 11 without access to reliable drinking water，roads and basic services.Local governments, 12therefore,should take measures to protect their residents.”Unfortunately，they tend to move towards rhetoric 13ratherthan meaningful responses, Romero Lankao writes, ” They don’t impose construction standards that could reduce heating and air conditioning needs. They don't emphasize mass transit and reduce 14automobile use. In fact, many local governments are taking a hands—off approach.” Thus, she urges themto change their 15 idle policies and to take strong steps to prevent the harmful effects of climate change on cities.第十二篇Free Statins With Fast Food Could Neutralize Heart RiskFast food outlets could provide statin drugs freeof 1charge so that customers can reduce the heart disease dangers of fatty food, researchers at Imperial College London 2suggest in a new study．Statins reduce the 3amount of unhealthy ”LDL” cholesterol in the blood. A wealth of trial data has proven them to be highly effective at lowering a person’s heart attack4risk .In a paper published in the American Journal of Cardiology，Dr Darrel Francis and colleagues calculate that the reduction in heart attack risk offered by a statin is 5enough to offset the increase in heart attack risk from 6eating a cheeseburger and drinking a milkshake．Dr Francis，from the National Heart and LungInstitute at Imperial College London，who is the senior author of the study, said:”Statins don’t cut out a11 of the 7unhealthy effects of cheeseburgers and French fries．It’s better to avoid fatty food altogether．But we’ve worked out that in terms of your 8possobility of having a heart attack. Taking a statin can reduce your risk to more or less thesame 9degree as a fast food meal increases it.”“It’s ironic that people are free to take as manyunhealthv condiments in fast food outletsas they 10like , but statins, which are beneficial to heart health, have to be prescribed. It makes sense to make risk-reducing statins available just as easily as the unhealthy condiments that are 11provided free ofcharge．It would cost less than 5 penceper 12customer ---not much different to a sachet ofsugar.” Dr Francis said．When people engage in risky behaviours like driving or smoking, they’re encouraged to take 13measures that lower their risk, 1ike 14wearing a seatbelt or choosing cigarettes with filters. Taking a statin is a rational way of 15lowering some of the risks of eating a fatty meal．第十三篇Better Solar Energy Systems: More Heat, More Light （2018已考）Solar photovoltaic thermal energy systems, or PVTs, generate both heat and electricity, but __1_until_ now they haven’t been very good at the heat-generating part compared to a stand-alone solar thermal collector. That’s because they operate at low temperatures to cool crystalline silicon solar cells, which lets the silicon generate more __2_electricity_ but isn’t a very efficient way to gather heat.That’s a problem of __3ceonomics_ . Good solar hot-water systems can harvest much more energy than a solar-electric system at a substantially lower __4_cost_.And it，s also a space problem：photovoltaic cells cantake up all the space on the roof, leaving little room for thermal applications.In a pair of studies, Joshua Pearce, an associate professor of materials science and engineering, has devised a __5_solution_ in the form of a better PVT made with a different kind of silicon. His research collaborators are Kunal Girotra from ThinSilicon in California and Michael Pathak and Stephen Harrison from Queen’s University, Canada."Most solar panels are made with crystallinesilicon，but you can also make solar cells out ofamorphous silicon, __6_commonly_ known as thin-film silico n. They don’t create as much electricity, but they are lighter, flexible, and cheaper. And, because they __7require__ much less silicon, they have a greenerfootprint. Unfortunately，thin-film silicon solar cells are__8vulnerable__ to some bad-news physics in the form of the Staebler-Wronski effect.“That means that their efficiency __9drops__ when you expose them to light —pretty much the worst possible effect for a solar cell,” Pearce explains，which is one of the __10reasons__ thin- film solar panels make up only a small fraction of the market.However, Pearce and his team found a way to engineer around the Staebler-Wronski effect by incorporating thin-film silicon in a new __11_type_ of PVT. You don’t have to cool down thin-film silicon to make it work. In fact，Pearce’s group discovered that byheating it to solar-thermal operating temperatures，near the boiling __12point__ of water, they could make thicker cells that largely __13overcame__ the Staebler-Wronski effect. When they applied the thin-film silicon directly to a solar thermal energy __14collector__ , they also found that by baking the cellonce a day，they __15boosted__ the solar cell’selectrical efficiency by over 10 percent.第十四篇Sharks Perform a Service for Earth’s WatersIt is hard to get people to think of sharks as anything but a deadly enemy1. They are thought to 1 people frequently. But these fish2 perform a 2 service for earth's waters and for human beings. Yet business and sport fishing3 are threatening their 3 Some sharks are at risk of disappearing from 4Warm weather may influence both fish and shark activity. Many fish swim near coastal areas 5 their warm waters. Experts say sharks may follow the fish into the same areas, 6 people also swim. In fact, most sharks do not purposely charge at or bite humans. They are thought to mistake a person 7 a sea animal, such as a seal or sea lion. That is why people should not swim in。