2019年职称英语考试理工类C级模拟(4)
2019年职称英语考试理工类C级补全短文冲刺试题4
2019年职称英语考试理工类C级补全短文冲刺试题4 How to Jump Queue FuryIf you find yourself waiting in a long queue at anairport or bus terminus this holiday, will you try to analyze what it is about queuing that makes you angry? Or will you just get angry with the nearest official?Professor Richard Larson, an electrical engineer at the Massachusetts Institute of Technology, hates queuing but rather than tear his hair out, he decided to study the subject. 46. He cites an experiment at Houston airport where passengers had to walk for one minute from the plane to the baggage reclaim and then wait a further seven minutes to collect their luggage. Complaints were frequent, especially from those who had spent seven minutes watching passengers with just hand baggage get out immediately.The airport authorities decided to lengthen the walk from the aircraft, so that instead of a one-minute fast walk, the passengers spent six minutes walking 47 The extra walk extended the delay by five minutes for those carrying only hand baggage, but passenger complaints dropped almost to zero.The reason? Larson suggests that it all has to do with what he calls “social justice”. If people see others taking a short cut, they will find the wait unbearable. 48Another aspect Larson studied was the observation that people get more fed up if they are not told what is going on. 49But even knowing how long we have to wait isn't the whole answer. We must also believe that everything is being done to minimize our delay. Larson cites the example of two neighboring American banks. One was highly computerized and served a customer, on average, every 30 seconds.50. But because the tellers at the second bank looked extremely busy, customers believed the service was faster and manytransferred their accounts to the slower bank. Ultimately, the latter had to introduce time-wasting ways of appearing more dynamic.A So in the case of the airport, it was preferable to delay everyone.B The other bank was less automated and took twice as long.C When they finally arrived at the baggage reclaim, the delay was then only two minutes.D His first finding, which backs up earlier work at the US National Science Foundation, was that the degree of annoyance was not directly related to the time.E It's unbearable for the airport to delay everyone.F Passengers told that there will be a half-hour delay are less unhappy than those left waiting even twenty minutes without an explanation.答案：46 D 47 C 48 A 49 F 50 B。
职称英语考试综合类C级模拟试题四及答案解析3
第2篇Stress Level Tied to Education LevelPeople with less education suffer fewer stressful days, according to a report in the current issue of the Journal of Health and Social Behavior．However, the study also found that when 1ess-educated people did suffer stress it was more severe and had a larger impact on their health．From this。
researchers have concluded that the day-to-day factors that cause stress are not random．Ⅵr11ere you are in society determines the kinds of problems that you have each day, and how well you will cope with them．The research team interviewed a national sample of 1．03 1 adults daily for eight days about their stress level and health．People without a high school diploma reported stress on 30 percent of the study days，people with a high school degree reported stress 38 percent of the time，and people with college degrees reported stress 44 percent of the time．‘‘Less advantaged people are less healthy on a daily basis and are more likely to have downward turns in their health。
职称英语理工类C级补全短文复习资料(4)
职称英语理工类C级补全短文复习资料(4)False Fear of Big FishMany people believe sharks(鲨鱼)are dangerous and will always try to hurt or even kill humans.(46)A shark exhibition at the National Aquarium(水族馆)in Baltimore，US，proves this. Visitors can touch young sharks.see their eggs develop and watch a dozen different species swim smoothly around a huge tank.Most people fail to realize that shark attacks don’t happen very often.Humans are mote likely to be killed by lightning than by a shark.(47)There，kids can learn，from an early age，not to fear sharks.‘'People fear what they don’t know，”said Nancy Hotchkiss。
an organizer of the exhibition.“Sharks have been around for400million years and play1til important role in the ocean’s food chain.We want people to discover that sharks are amazing animals that need our respect and protection。
职称英语理工类C级试题及答案
职称英语理工类C级试题及答案第1部分：词汇选项(第1～15题，每题1分，共15分)下面每个句子中均有1个词或短语划有横线，请为每处划线部分确定1个意义最为接近的选项。
1 I'd very much like to know what your aim in life isA thoughtB ideaC goalD plan2 The policemen acted quickly because lives were at stake.A in dangerB in difficultyC in despairD out of control3Practically all animals communicate either through sounds or through soundless codes.A CertainlyB ProbablyC AlmostD Absolutely4 Mary rarely speaks to Susan.A slowlyB seldomC weaklyD constantly5 I'm working with a guy from London.A teacherB studentC friendD man6 You'd better put these documents in a safe placeA darkB secureC guardedD banned7 The courageous boy has been the subject of massive media coverageA extensiveB continuousC instantD quick8 The town is famous for its magnificent buildingsA high-riseB modernC ancientD splendid9 The great change of the city astonished all the visitorsA surprisedB scaredC excitedD moved10 Jack packed up all the things he had accumulated over the last ten yearsA futureB farC pastD near11 Would you please call my husband as soon as possible?A visitB phoneC consultD invite12 We had a long conversation about her parents.A speechB questionC talkD debate13 The chairman proposed that we stop the meetingA statedB announcedC demandedD suggested14 Obviously these people can be relied on in a crisisA lived onB depended onC believed inD joined in15 There is always excitement at the Olympic Games when an athlete breaks a recordA beatsB maintainsC matchesD tries第2部分：阅读判断(第16～22题，每题1分，共7分)下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是正确信息，请选择A;如果该句提供的是错误信息，请选择B;如果该句的信息文中没有提及，请选择C.Importance of Children's Oral HealthFebruary is National Children's Dental (牙齿的)Health Month，but in children good oral care is critical every day. The first comprehensive study on the nation's oral health，released recently by the Office of the U.S. Surgeon General，calls dental and oral diseases a “silent epidemic (流行病)，” even in children. The report states that more than 51 million school hours are lost each year to dental-related illness. In fact，a recent study pointed to dental care as the most common unmet health need among American children.To help counter this，the American Academy of Periodontology (牙周病学)(AAP)is launching an effort to educate children and parents about the prevention of dental diseases in children.“This is important because oral problems can impact self-esteem for children and lead to problems of eating，speaking and attending to learning，” said Michael McGuire，president of the AAP.Common dental problems seen in children are cavities (龋洞)and gingivitis (龈牙)，which are found in the majority of U.S. children. “When th ese problems are not caught early and treated，they can develop into more severe problems and cause unnecessary suffering，” said McGuire “However，much of the time，oral problems are avoidable problems.”In the Rio Grande Valley in Texas，a group of more than 120 dentists volunteers to deliver dental care to thousands of low-income children each year with its Mobile Dental Unit that travels from school to school.“According to the Surgeon General's Report，about 37 percent of children have not had a dental visit before starting school，” said McGuire. “When children don't see dentists they miss the opportunity to have problems caught early before theydevelop into larger，more expensive problems to treat，and parents miss the opportunity to learn how to promote good oral habits in their children.”16 Only in February should attention be paid to children's oral healthA RightB WrongC Not mentioned17 Dental and oral diseases are common in both adults and childrenA RightB WrongC Not mentioned18 Boys miss more school hours each year due to dental-related illnessA RightB WrongC Not mentioned19 Oral problems in children can develop into more severe problems.A RightB WrongC Not mentioned20 Oral problems can not be avoided in any wayA RightB WrongC Not mentioned21The low-income children are very grateful to the dentists.A RightB WrongC Not mentioned22 Some children have never seen a dentist before starting school.A RightB WrongC Not mentioned。
2019年职称英语理工类(C级)试题：阅读理解
2019年职称英语理工类（C级）试题：阅读理解第4部分：阅读理解(第31——45题，每题3分，共45分)下面有3篇短文，每篇短文后有5道题。
请根据短文内容，为每题确定1个选项。
第一篇Can you hear this?When something creates a sound wave in a room or an auditorium (礼堂)listeners hear the sound wave directly from the source. They also hear the reflections as the sound bounces off the walls, floor, and ceiling . These are called the reflected wave or reverberant (反射的) sound, which canbe heard even after the sound is no longer coming from the source .The reverberation time of an auditorium is determined by thevolume or interior size of the auditorium .It is also determined by how well orhow poorly the walls, ceiling, floor, and contents of the room (including thepeople) absorb sound. There is no ideal reverberation time .The full-soundperformance of music such as Wagner operas or Mahler symphonies should have along reverberation time. The light, rapid musical passages of Bach or Mozartneed a reverberation time somewhere between.Acoustic problems often are caused by poor auditorium design .Smooth , curved (弯曲的)reflectingsurfaces createlarge reflections . Parallel (平行的)walls reflect sound back andforth, creating a rapid ,repetitive pulsing(有节奏的跳动)effect. Large pillars (柱)andcorners can cause acousticshadows as the sound waves try to pass around theobject . Some of these problems can be solved by using absorbers and relectorsto change the reverberation time of a room .For example , hanging largereflectors , called clouds , over the performers will allow some soundfrequencies to reflect and others to pass yo achieve a pleasing mixture ofsound.1. This Passage is mainly aboutA sound waves and their acoustic effect .B the types of music orchestras playC walls of an auditoriumD the design of an auditorium2.Wagner operas and Mahler symphonies sound fuller in an auditorium withA a short reverberation timeB a long reverberation timeC an intermediate reverberation timeD no reverberation time3. Thispassage suggests that a good auditorium shouldA achieve a pleasing mixture of soundB get rid of all reflectionsC not have absorbers.D have smooth surfacesrge pillars and corners mayA make sound rich and fullB be cures for sound problemsC be sources of sound problemsD function as well as clouds5.The word “acoustic” in the last paragraph has something to do withA performanceB MusicC soundD noise第二篇Outside-the-classroomLearning Makes a Big DifferencePuttinga bunch of college students in charge of a $300,000 Dance Marathon, fundraisersurely sounds a bitrisky1.When you consider the fact that the money issupposed to be given to children in need of medical care, you might call theidea crazy.Moststudent leaders don't want to spend a large amount of time on something theycare little about, said 22-year-old University of Florida student DarrenHeitner. He was the Dance Marathon's operations officer for two years.YvonneFangmeyer, director of the student organization office at the University ofWisconsin, conducted a survey in February of students involved in campusorganizations2. She said the desire for friendship was the most frequentlycited reason for joining.At largeuniversities like Fangmeyer's, which has more than 40,000 students, thestudents first of all want to find a way to "belong in their own corner ofcampus".KatieRowley, a Wisconsin senior, confirms the survey's findings." I wanted tomake the campus feel smaller by joining an organization where I could not onlyget involved on campus but also find a group of friends."All ofthis talk of friendship, however, does not mean that students aren't thinkingabout their resumes. "I think that a lot of people do join to 'fatten uptheir resume'", said Heitner."At the beginning of my college career,I joined a few of these organizations, hoping to get a start in my leadershiproles."。
2019年职称英语考试：理工类C级概括大意题(4)
2019年职称英语考试：理工类C级概括大意题(4)60th Annlversary Ceremony in Moscow1 With thousands of soldiers and war veterans parading across Moscow's Red Square and fighter jets screaming overhead， Russia celebrated the 60th anniversary ofdefeating Nazi Germany. More than 50 world leaders，including China's President Hu Jintao， attended the ceremony.2 Speaking at the start of the parade， Russia'sPresident Vladimir Putin praised all those who fought for freedom and independence. "The war shows that resorting to force to solve problems will result in tragedy for the world，so a peaceful order should be safeguarded (护卫) based on security， justice and cultural exchange，" Putin said. "Faced with the real threat of terrorism today， we must remain faithful to the memory of our fathers. It is our dutyto defend a world order based on security and justice and ona new culture of relations among nations that will not allowa repeat of any war， neither 'cold' nor 'hot'，" he continued.3 The Second World War is perhaps the most catastrophic (灾难性的) event that mankind has ever suffered. The war affected 80 per cent of the world's people at that time，from 61 countries， and claimed 55 million lives.4 After the celebration， President Hu said that peace，development and cooperation were the future. "China will unswervingly (坚定地) follow the road of peace and development and will make a joint effort with all nations tocontribute to safeguarding world peace and promoting development，" he said.5 German Chancellor Gerhard Schroeder asked Russia for forgiveness for the suffering Germany inflicted (造成) during the Second World War in an article in Sunday's Komsomolskaya Pravda newspaper. "Today we ask forgiveness for the suffering inflicted upon the Russian people and other peoples at the hands of Germans and in the name of Germans，" Schroeder said.6 President Hu and the other leaders also joined a wreath (花圈) laying ceremony at the Tomb of the Unknown Soldiers on Monday.1 Paragraph 22 Paragraph 33 Paragraph 44 Paragraph 5A Pacific warB Gloomy worldC Putin's commemorating speechD China's determinationE Schroeder's plea for forgivenessF World's worst disaster5 Russia celebrated6 World War Two deprived7 China pledges herself to follow8 The world leaders finally attendedA an opening ceremonyB 61 countriesC a wreath laying ceremonyD the 60th anniversary of its victory over Nazi GermanyE the road of peace and developmentF 55 million people of their lives参考答案：1. C2. F3. D4. E5. D6. F7. E8. C。
2019职称英语考试复习资料综合类C级(四)
2019职称英语考试复习资料综合类C级(四)A Strong Greenhouse Gas1.Methane is a colorless, odorless gas; it is also a potent greenhouse gas, and once released into the atmosphere, it absorbs heat radiating from Earth’s surface. That’s why methane is a major contributor to the planet’s increasing temperature rise—or global warming. Molecule for molecule, methane’s heat-trapping power in the atmosphere is 21 times stronger than carbon dioxide, the most abundant greenhouse gas.2.With 13 billion cows belching almost constantly around the world (100 million in the U.S. a lone), it’s no surprise that methane released by livestock is one of the chief global sources of the gas. Other prime methane sources： petroleum, drilling, coal mining, solid-waste landfills and wetlands.3.Greenhouse gases like methane and carbon dioxide make up only a small part of Earth’s atmosphere, which is 78 percent nitrogen and nearly 21 percent oxygen. And without greenhouse gases to trap the sun’s heat and warm the planet, life was we know it couldn’t exist. But in the last 200 years, human activity that requires burning oil, natural gas, and coal for energy has magnified the greenhouse effect.4.Atmospheric concentrations of methane have more than doubled in the last two centuries. Blame for this often focuses on big industries and gas-guzzling vehicles. But agriculture plays a major role, too. In the past 40 years alone, the global cattle population has doubled.5.Cows munch mostly grasses and hay—yet they grow bigand hefty. Why? Because of the rumen. The rumen holds 160liters of food and billions of microbes. These microscopic bacteria and protozoa break down cellulose and fiber into digestible nutrients. A cow couldn’t live without its microbes. As the microbes digest cellulose, they release methane. The process occurs in all animals with a rumen (cows, sheep, and goats, for example), and it makes them very gassy. It’s part of their normal digestion process. When they chew their cud, they regurgitate some food to rechew it, and allthis gas comes out. the average cow expels 600 liters of methane a day.6.That’s why we say livestock gas is also a major factor of causing the global warming.词汇：methane 甲烷 munch 用力咀嚼odorless 无味的 hefty 健壮的potent 强有力的 rumen 瘤胃belch 打嗝 protozoa 原生动物(复数)livestock 家畜，牲畜 cellulose 纤维素landfill 埋填的废渣 nutrient 有营养的magnify 扩大 cud 反刍的食物guzzle 大量消耗(燃料等) regurgitate 反刍注释：1.once released into the atmosphere…：一旦(甲烷)释放到大气中……once released into the atmosphere相当于once methaneis released into the atmosphere。
2019职称英语理工类C级真题(阅读理解)10页word文档
2019职称英语理工类C级真题(阅读理解) 第四部分：阅读理解Why Buy Shade-Grown Coffee?When people argue about whether coffee is good for health, they're usually thinking of the health of the coffee drinker. Is it food for your heart? Does it increase blood pressure? Does it help you concentrate? However, coffee affects the health of the human population in other ways, too.Traditionally, coffee bushes were planted under the canopy(树冠)of taller indigenous(土生土长的)trees. However, more and more farmers in Latin America are deforesting the land to grow full-sun coffees. At first, this increases production because more coffee bushes can be planted if there aren’t any trees. With increased production come increased profits.Unfortunately, deforesting for coffee production immediately decreaseslocal-wildlife habitat. Native birds nest and hide from predators(捕食者)in the tall trees and migrating birds rest there.Furthermore, in the long term, the full-sun method also damages the ecosystem because more chemical fertilizers and pesticides are needed to grow the coffee. The fertilizers and pesticides kill insects that eat coffee plant, but then thebirds eat the poisoned insects and also die. The chemicals kill or sicken other animals as well, and can even enter the water that people will eventually drink.Fortunately, farmers in Central and South America are beginning to grow more coffee bushes in the shade. We can support these farmers by buying coffee with such labels as "shade grown" and "bird friendly." Sure, these varieties might cost a little more. But we're paying for the health of the birds, the land, ourselves, and the planet. I think it's worth it.31.What is the main idea of this passage?A. Farmers are changing the way they grow coffee.B. Coffee is becoming more expensive to produce.C. Shade-grow coffee is more expensive than sun-grow coffee.D. People should buy shade-grown coffee.32. The function of the word "Traditionally" in Paragraph 2 is to show_____.A. the positive effects of coffee.B. a change of coffee growth.C. something that is the most important.D. how coffee production used to be33.What does increased production of full-sun coffee bring about?A. More insects.B. Better quality coffee.C. Larger farms.D. Higher profits.34.How do farmers find more land for growing full-sun coffee?A. They buy more land from other farmers.B. They cut down trees.C. They move to another country.D. They turn grassland into farmland.35. The full-sun method may affect the following EXCEPT_____ full sunA. insects.B. air.C. birds.D. humansSoot(煤烟灰)and Snow: a Hot CombinationNew research from NASA scientists suggests emissions of black soot after the way sunlight reflects off snow. According to a computer simulation, black soot may be responsible for 25 percent of observed global warming over the past century.Soot in the higher latitudes(维度)of the Earth, where ice is more common, absorbs more of the sun's energy and warmth than an icy, white background. Dark-colored black carbon, or soot, absorbs sunlight, while lighter colored ice reflects sunlight.Soot in areas with snow and ice may play an important role in climate change. Also, if snow and ice covered areas begin melting, the warming effect increase, as the soot becomes more concentrated on the snow surface." This provides a positive feedback, as glaciers and ice sheets melt, they tend to get even dirtier." said Dr. James Hansen, a researcher at NASA's Goddard Institute for Space Studies, New York.Hansen found soot's effect on snow albedo(反照率), which may be contributing to trends toward early springs in the Northern Hemisphere, such as thinning Arctic sea ice and melting glaciers permafrost. Soot also is believed to play a role in changes in the atmosphere above the oceans and land."Black carbon reduces the amount of energy reflected by snow back into space, thus heading the snow surface more than if there were no black carbon, " Hansensaid. Soot's increased absorption of solar energy is especially effective in warming the world's climate." This forcing is unusually effective, causing twice as much global warming as a carbon-dioxide forcing of the same magnitude." Hansen noted.Hansen cautioned, although the role of soot in altering global climate is substantial, it does not alter the fact that greenhouse gases are the primary cause of climate warming during the past century. Such gases are expected to bi the largest climate forcing for the rest of the century.The researchers found that observed warming in the Northern Hermisphere was large in the winter and spring at middle and high latitudes. These observations were coherent with the researchers' climate model situations, which showed some of the largest warming effects occurred when there were heavy snow cover and sufficient sunlight.36.Which of the following statements of soot is NOT true?A. It absorbs sun's heat.B. It is responsible for climate change.C. It reflects sunlight.D. It may account for a quarter of global warming over the past century.37. Which of the following areas shows a greater warming effect?A. Ice sea areas.B. Areas with black carbon.C. Areas covered with white snow.D. Melting glaciers.38."This forcing" in Paragraph 5 refers to?A. sun's heating on snow surface.B. soot's increased absorption of solar energy.C. carbon-dioxide's warming effect.D. snow's increased reflection of sunlight.39. What is the main cause of climate warming during the past century?A. Soot.B. Snow.C. Greenhouse gases.D. Wind.40. The largest warming effects happened in the Northern Hemisphere withA. X sea ice and insufficient sunlight.B. light snow cover and sufficient sunlight.C. heavy snow cover and sufficient sunlight.D. thick sea ice and insufficient sunlight.A Record-Breaking RoverNASA’s Mars rover Opportunity has boldly gone where no rover has gone before—at least in terms of distance. Since arriving on the Red Planet in 2019, Opportunity has traveled 25.01 miles, more than any other wheeled vehicle has on another world.On July 27, after years of moving about on Martian ground, the golf-cart-sized Opportunity had driven more than 24 miles, beating the previous record holder—a Soviet rover sent to the moon in 1973.“This is so remarkable considering Opportunity was intended to drive about 1 kilometer and was never designed for distance,” says John Callas, the Mars Exploration Rover Project Manager.He works at NASA’s Jet Propulsion Laboratory in Pasadena, California. “But what is really importantly is not how many miles the rover has racked up, but how much exploration and discovery we have accomplished over that distance.”OPPORTUNITYThe solar-powered Opportunity and its twin rover, Spirit, landed on Mars 10 years ago on a mission expected to last 3 months. The objective of the rovers was to help scientists learn more about the planet and to search for signs of life，such as the possible presence of water.Spirit stopped communicating with Earth in March 2019, a few months after it got stuck in a sand pit. But Opportunity has continued to collect and analyze Martian soil and rocks.During its mission, Opportunity has captured, and sent back to Earth, some 187,000 panoramic and microscopic images of Mars with its cameras. It has also provided scientists with data on the planet’s atmosphere, soil, rocks, and terrain.MARATHON ROVERThe rover doesn’t seem to be ready to stop just yet. If Opportunity can continue on, it will reach another major investigation site when its odometer hits 26.2 miles. Scientists call this site Marathon Valley, because when the rover reachesthe area, it will have traveled the same distance as the length of a marathon since its arrival on Mars.Researchers believe that clay minerals exposed near Marathon Valley could hold clues to Mars’s ancient environment1. Opportunity’s continuing travels will also help researchers as they plan for an eventual human mission to the Red Planet.41. Opportunity is a record breaking rover in the sense of_____.A. how long is has stayed in spaceB. how far it has traveledC. how much investment it has involvedD. how many facilities it has been equipped with42. What does John Callas say about Opportunity’s long distance travel?A. It ha sn’t met scientists’ expectation yetB .It hasn’t been appreciated appropriatelyC .It is secondary to what has been discoveredD .It is what scientists have been aiming at43.One of the objectives of sending Opportunity and Spirit is to_____.A. collect soil and send back to EarthB. develop multinational space explorationC. test how well solar-powered rovers work in outer spaceD. look for the possible presence of life44. Which of the following statements is true of Opportunity?A. It will come back to earth soon.B. Another rover will be sent to replace it.C. It is travelling to XX(看不清，其余选项错误)D. It will work with other rovers exploring Mars45.暂缺更多职称英语考试免费资料请访问“新东方在线职称英语频道”。
《职称英语》 (理工类C级)真题(附答案)
《职称英语》（理工类C级）真题(附答案).第 1 题题目分类:未按章节分类的真题、模拟试题 > 词汇选项 > The AIDS convention will be held in Glasgow.{A}. party{B}. celebration{C}. union{D}. conference正确答案：D,第 2 题题目分类:未按章节分类的真题、模拟试题 > 词汇选项 > He made a number of rude remarks about the food.{A}. comments{B}. signs{C}. manners{D}. noises正确答案：A,第 3 题题目分类:未按章节分类的真题、模拟试题 > 词汇选项 > The new service helped boost pre-tax profits by 10%. {A}. return{B}. realize{C}. increase{D}. double正确答案：C,第 4 题题目分类:未按章节分类的真题、模拟试题 > 词汇选项 > Lack of space forbids further treatment of the topic here. {A}. receives{B}. prevents{C}. deserves{D}. accepts正确答案：B,第 5 题题目分类:未按章节分类的真题、模拟试题 > 词汇选项 > Take some spare clothes in case you get wet.{A}. extra{B}. fine{C}. winter{D}. outdoor正确答案：A,第 6 题题目分类:未按章节分类的真题、模拟试题 > 词汇选项 > The book raised a storm of controversy.。
2019年职称英语《理工类C级》考试模拟试题
2019 年职称英语《理工类 C 级》考试模拟试题第一部分：词汇选项（第1〜15题，每题1分，共15分）下面共有15 个句子，每个句子中均有1 个词或短语划有底横线，请从每个句子后面所给的4 个选项中选择1 个与划线部分意义最相近的词或短语。
答案一律涂在答题卡相对应的位置上。
1 The Group of Seven, a clique of Canadian artists painting at the turn of the century, has been credited with arousing a widespread awareness of Canada's rugged landscape.A stimulatingB prolongingC glorifyingD encouraging2 The term "composition" refers to the way the componentsof a drawing are arranged by the artist.A paintedB imaginedC put togetherD sharply perceived3 Located in Washington, D. C., the Library of Congress contains an imposing array of books on every conceivable subject.A historyB catalogC shelfD collection4 Acetate is one of the most important artificial fibers.A insulatingB syntheticC unadornedD complex5 Biologists have ascertained that specialized cells convert chemical energy into mechanical energy.A determinedB arguedC pretendedD hypothesized6 As nineteenth-century American cultural aspirations expanded, women stepped into a new role as interpreters of art, both by writing works on art history and by teaching art.A patronageB imaginationC ambitionsD opportunities7 A gift to the United States from France, the Statue of Liberty was assembledand dedicated in 1886.A repairedB brought overC unpackedD put together8 New England town meetings, in their most highly developed form, are assemblies of the voters.A protestsB gatheringsC responsibilitiesD liabilities9 Eleanor Roosevelt urged legislation to assist the poor and oppressed.A helpB houseC employD encourage10 Nitrogen is the most plentiful gas in the atmosphere.A waterB earthC bodyD air。
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2019年职称英语考试理工类C级模拟（4）
第2部分：阅读判断(第16～22题，每题1分，共7分)
下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是准确信息，请选择A；如果该句提供的是错误信息，请选择B；如果该句的信息文中没有提及，请选择C。
Radiocarbon Dating
Nowadays scientists can answer many questions about the past through a technique
called radiocarbon(放射性碳)．or carbon-14，dating One key to understanding how and
why something happened is to discover when it happened
Radiocarbon dating was developedinthelatel940s by physicist Willard F Libby at
the University of Chicago An atom of ordinary carbon called carbon-12 has six protons
(质子)and six neutrons(中子)in its nucleus(原子核)Carbon-14，or C-14，is a radioactive unstable form of carbon that has two extra neutrons .It returns to e more stable form of carbon through a process called decay(衰减)This process involves the loss of the extra neutrons and energy from the nucleus
In Libby’s radiocarbon dating technique，the weak
radioactive emissions(放射)from this decay process are counted by instruments such as a radiation detector and
counter．The decay rate is used to determine the proportion of C-14 atoms in the sample being dated
Carbon-14 is produced in the Earth’s atmosphere when nitrogen(氨)-14．or N-14，interacts with cosmic rays(宇宙射线)Scientists believe since the Earth was formed，the amount of nitrogen in the atmosphere has remained constant Consequently,C-14 formation is thought to occur at a constant rate Now the ratio of C-14 to other carbon atoms in the atmosphere is known Most scientists agree that this ratio is useful for dating items back to at least 50．000 years
All life on Earth is made of organic molecules(分子)that contain carbon atoms coming from the atmosphere So all living things have about the same ratio of C-14 atoms to other carbon atoms in their tissues(组织)Once an organism(有机
体)dies it stops taking in carbon in any form，and the C-14 already present begins to decay Over time the amount of C-14 in the material decreases and the ratio of C-14 to other carbon atoms goes down In terms of radiocarbon dating．the fewer C-14 atoms in a sample，the older that sample is.。