职称英语考试《理工类》章节练习题精选及答案0517-42
职称英语考试《理工类》章节练习题精选及答案0517-41
职称英语考试《理工类》章节练习题精选及答案0517-411、Arctic MeltEarth's North and South Poles are famous for being cold and icy. Last year, however, the amount of ice in the Arctic Ocean (北冰群) fell to a record low.Normally, ice builds in Arctic waters around the North Pole each winter and shrinks(缩小) during the summer. But for many years, the amount of ice left by the end of summer has been declining.Since 1979, each decade has seen an 11.4 percent drop in end of summer ice cover. Between 1981 and 2000, ice in the Arctic lost 22 percent of its thickness, becoming 1.13 meters thinner. Last summer, Arctic sea ice reached its thinnest levels. By the end of summer 2007, the ice had shrunk to cover just 4.2 million square kilometers. That's 38 percent less area than the average cover at that time of year. And it's a very large 23 percent below the previous record low, which was set just 2 years ago. This continuing trend has made scientists concernedto.There may be several reasons for the ice melt, says Jinlun Zhang, an oceanographer (海洋学家)at the University of Washington in Seattle. Unusually strong winds blew through the Arctic last summer. The winds pushed much of the ice out of the central Arctic, leaving a large area of thin ice and open water. Scientists also suspect that fewer clouds cover the Arctic now than in the past. Clearer skies allow more sunlight to reach the ocean. The extra heat warms both the water and the atmosphere. In parts of the Arctic Ocean last year, surface temperatures were 3.57 Celsius warmer than the average and 1.5c warmer than the previous record.With both air and water getting warmer, the ice is melting from both above and below. In some parts of the Beaufort Sea, north of Alaska and western Canada, ice that measured 3.3 meters thick at the beginning of the summer was measured just 50 cm by season's endThe new measurements suggest that melting is far more severe than the thinking of scientists. Some scientists fear that the Arctic is stuck in a warming trend.The word "builds" in paragraph 2 could be best replaced by ______【单选题】A.establishesB.expandsC.createsD.constructs正确答案:B答案解析:本题难度不大，文章此处build的引申意义指“（冰层）加厚”，选项中expands是其近义解释，答案是B。
职称英语考试《理工类》章节练习题精选及答案0517-4
职称英语考试《理工类》章节练习题精选及答案0517-41、Walking to Exercise the BrainDo you think sitting and studying all the time will improve students grades? Think again. Getting some exercise may help, too.New research with older people suggests that taking regular walks helps them pay attention better than if they didn't exercise.Previous research had shown that mice learn, remember and pay attention better after a few weeks of working out on a running wheel. Mice that exercise have greater blood flow to the brain than those who don't. Their brain cells also make more connections.Neuroscientists (神经科学家) from the University of Illinois at Urbana Champaign wanted to find out if the same thing is true for people. First, they measured the physical fitness of 41 adults, ages 58 to 77, after each person walked I mile. Then, participants looked at arrows on a computer screen and had touse computer keys to show which way one particular arrow was pointing.Adults who were physically fit were faster at the arrow task, and their answers were just as accurate as their less - fit peers, the researchers found. The fitter participants also had more blood flow to a part of their brain responsible for paying attention and making decisions.In a second study, 15 elderly people who completed a 6 - month aerobic - training (有氧运动) course were faster at attention tasks compared with 14 seniors who just did stretching and toning (韵律操) exercises for the same amount of time.So, even going for a walk every 2 or 3 days for just 10 to 45 minutes can help. That should be good news for the elderly. The effects of exercising on the brains of younger people haven't been studied yet. Still, it can't hurt to take occasional breaks and go for a walk or run around with friends. Whatever you do, though, don't try to read and walk at the same time. You could end up hurting yourself!Walking regularly helps elderly people ______.【单选题】A.lose weightB.become happierC.concentrate betterD.look younger正确答案:C答案解析:本题难度不大，找到答案依据不难。
全国职称英语等级考试真题模拟及答案理工类
全国职称英语等级考试真题及答案理工类全国职称英语等级考试真题及答案理工类（B级）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个词或短语划有底横线，请为每处划线部分确定1个意义最为接近的选项。
1 Marsha confessed that she know nothing of computer.A hopedB answeredC admittedD reported2 We need to extract the relevant financial data.A storeB saveC reviewD obtain3 Mr. Henley has accelerated his sale of shares over the past year.A heldB increasedC expectedD offered4 The police believe the motive for the murder was jealousy.A choiceB ideaC decisionD reason5 The high-speed trains can have major impact on our livesA effortB problemC influenceD concern6 His shoes were shined to perfection.A clearedB washedC mendedD polished7 We explored the possibility of expansion at the conference.A offeredB includedC investigatedD accepted8 The study also notes a steady decline in the number of college students taking science courses.A continuousB relativeC generalD sharp9 Anderson left the table，remarking that he had some work to do.A sayingB doubtingC thinkingD knowing10 We have to act within the existing legal framework.A limitB systemC procedureD status11 She always finds fault with everything.A simplifiesB evaluatesC examinesD criticizes12 The view from my bedroom window was absolutely spectacular.A magnificentB generalC traditionalD strong13 At that time，we did not fully grasp the significance of what had happened.A giveB understandC attachD lose14 They converted the spare bedroom into an office.A reducedB movedC turnedD reformed15 Jane said that she couldn't tolerate the long hours.A spendB takeC lastD stand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.Lakes, Too, Feel Global WarmingThere's no doubt: In the last few decades, the average temperature on Earth has been higher than it's been in hundreds of years. Around the world, people are starting to measure the effects of global warming - and trying to figure out what to do about it.Scientists recently used satellites to study the temperatures of lakes around the world, and they found that lakes are heating up.Between 1985 and , satellites recordedthe nighttime temperatures of the surfaces of 167 lakes. During those 24 years, the lakes got warmer - by an average of about 0.045 degree Celsius per year.In some places, lakes have been warming by as much as 0.10 degree Celsius per year. At that rate, a lake may warm by a full degree Celsius, or 1.8 degrees Fahrenheit, in just 10 years. That difference may seem small - you might not even notice it in your bathtub. But in a lake, slightly warmer temperatures could mean more algae, and algae can make the lake poisonous to fish.The study shows that in some regions, lakes are warming faster than the air around them. This is important because scientists often use measurements of air temperature to study how the Earth is warming. By using lake temperatures as well, scientists can get a better picture of global warming.The scientists say data on lakes give scientists a new way to measure the impact of climate change around the world.That's going to be useful, since no country is too big or too small to ignore climate change. Scientists aren't the only ones concerned. Everyone who lives on Earth is going to be affected by therapidwarming of the planet.Many world leaders believe we might be able to do something about it, especially by reducing the amount of greenhouse gases we put into the air.That's why the United Nations started the Framework Convention on Climate Change, or UNFCCC. Every year the convention meets, and representatives from countries around the world gather to talk about climate change and discuss global solutions to the challenges of a warming world.16 Scientist have been keeping records of lake temperatures for over 30 years.A RightB WrongC Not mentioned17 The temperatures of lakes around the world have increased greatly between 1985 and .A RightB WrongC Not mentioned18 Lakes seem to be warming faster in Asia.A RightB WrongC Not mentioned19 A slight temperature increase in a lake could be harmful to fish.A RightB WrongC Not mentioned20 Scientists generally focus on air temperatures when studying global warming.A RightB WrongC Not mentioned21 Globle warming is less threatening to small countries.A RightB WrongC Not mentioned22 UNFCCC's annual meeting will be held in Mexico this year.A RightB WrongC Not mentioned第3部分：概括大意与完成句子（第23～30题，每题1分，共8分）下面的短文后有2项测试任务：（1）第23～26题要求从所给的6个选项中为第2～5段每段选择1个最佳标题；（2）第27～30题要求从所给的6个选项中为每个句子确定一个最佳选项。
职称英语等级考试试题答案及题解理工类
年职称英语等级考试试卷答案及题解理工类(级)第部分：词汇选项(第～题，每题分，共分)下面共有个句子，每个句子中均有个词或短语画有底横线，请从每个句子后面所给的个选项中选择个与画线部分意义最相近的词或短语。
请将答案涂在答题卡相应的位置上。
．．．．’．’．．，．．．，．．第部分：阅读判断(第题，每题分，共分)阅读下面这篇短文，短文后列出了个句子，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，请在答题卡上把涂黑；如果该句提供的是错误信息，请在答题卡上把涂黑；如果该句的信息文章中没有提及，请在答题卡上把涂黑。
(龙卷风)．．(漏斗状的) ．“．．．”．．，．．．．“, ”．“(粉红色)．．．”．．．．．．．．，，．．．(撤走)．’．“，”．“．．．”．.．．．．第部分：概括大意与完成句子(第～题，每题分，共分)阅读下面这篇短文，短文后有项测试任务：()第题要求从所给的个选项中为第段每段选择个正确的小标题；()第题要求从所给的个选项中选择个正确选项，分别完成每个句子。
请将答案涂在答题卡相应的位置上。
(烟头)，．，．“”．．．．．。
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(残片)．，．．．.．．．。
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．．．．．“’”．．．：．’，$．“，”，，，．“．．”$(零工)，，．’，．．’’，，第部分：阅读理解(第～题，每题分，共分)下面有篇短文，每篇短文后有道题，每道题后面有个选项。
请根据文章的内容，从每题所给的个选项中选择个最佳答案，涂在答题卡相应的位置上。
Germany．．．’．(繁荣) (衰退，(令人羡慕的) ．，．．．，．．．．，．(企业家)，，．，．．Ⅵ．Germany’，，．，，．Europe’, ，．．,．,．?．．?．—．．—．．．．．?.．．.“’’“”．“”．．“”．第二篇(陶瓷) ．(轻击) ，，Detroit．．．’．．Detroit．．．．．’·．．’．．，，一．一．．．(铋)。
(锶)．(钙)．．．．．．．．．．?．．·．．，．．．．?．一．．．?．．．．．，?．．第三篇，“”．．．(合成的)．, ．．．．“”．“”．,．．．，．，。
职称英语考试真题及答案理工类
【经典资料，ＷＯＲＤ文档，可编辑修改】【经典考试资料，答案附后，看后必过，ＷＯＲＤ文档，可修改】2015年全国职称英语考试真题及答案理工类（A级）2010-11-25 18:3中华会计网校【大中小】【打印】【我要纠错】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个词或短语划有底横线，请为每处划线部分确定1个意义最为接近的选项。
1．I can't put up with my neighbor's noise any longer，it'S driving me mad．A．tolerate B．generate C．reduce D．mensure2．Regular visits from a social worker can be of immense value to old people living alone．A．equal B．immediate C．moderate D．great3．He was rather vague about the reasons why he never finished school．A．bright B．unclear C．general D．bad4．I want to provide my boys with a decent education．A．special B．private C．general D．good5．Sleep stairs can present a particular hazard to older people．A．picture B．danger C．evidence D．case6．Our arrangements were thrown into complete turmoil．A．doubt B．relief C．failure D．confusion7．Patricia stared at the other girls with resentment．A．love B．surprise C．anger D．doubt。
职称英语考试《理工类》章节练习题精选及答案0517-25
职称英语考试《理工类》章节练习题精选及答案0517-251、Dairy Price-fixing ScandalTesco is preparing a legal battle to clear its name of involvement in the dairy price-fixing scandal that has cost consumers ￡270 million. Failure to prove that it had no part in collusion with other supermarkets and dairy processors may land it with a fine of at least ￡80 million. The Office of Fair Trading (OFT) said yesterday that Asda, Sainsbury's and the former Safeway, plus the dairy companies Wiseman, Dairy Crest and Cheese Company, had admitted being in a cartel to fix prices for milk, butter and cheese. They were fined a total of just over ￡116 million as part of a leniency deal offered by the watchdog to companies that owned up quickly to anti-competitive behaviour.Officials at the OFT admitted privately that they did not think they would ever discover which company or individual had initiated the pricing formula. But the watchdog recognises that at the time supermarkets were under pressure from politiciansand farmers to raise the cost of milk to save dairy farming, though it is not certain that money found its way to farmers. The OFT claimed in September that it had found evidence that the retail chains had passed future milk prices to dairy companies, which then reached a fixed price among themselves.The average cost to each household is thought to be ￡11.25 over 2002 and 2003, Prices went up an extra 3p on a pint of milk, 15p on a quarter of a pound of butter and 15p on a half pound of cheese. There is no direct recompense for consumers, however, and the money will go to the Treasury. The National Consumer Council gave warning that the admissions would dent consumer confidence in leading high street names and that people would become sceptical of their claims. Farmers for Action, the group of farmers that has led protests over low milk prices since 2000, is seeking legal advice on whether it can now bring a claim for compensation.The OFT investigation is continuing, however, in relation to Tesco, Morrisons and the dairy group Lactalis McLelland, and any legal action is expected to be delayed until that is completed. Tesco was defiant and said that it was preparing a robust defence of its actions. Lucy Neville-Rolfe, its executive director, said: "As we have always said, we acted independentlyand we did not collude with anyone. Our position is different from our competitors and we are defending our own case vigorously. Our philosophy is to give a good deal to customers." Morrisons has supported the OFT in inquiries into the former safeway business that it took over, but in a statement said that it was still making "strong representations" in its defence. A spokeswoman for Lactalis McLelland said that the company was "co-operating" with the OFT. Industry insiders suggested that the three companies were deliberately stalling the OFT investigation.Sainsbury's admitted yesterday that it had agreed to pay ￡26 million in fines, but denied that it had sought to profiteer. Justin King, the chief executive, said he was disappointed that the company had been penalised for actions meant to help farmers but recognised the benefit of a speedy settlement. Asda declined to say how much it would pay in fines and also said that its intention had been to help farmers under severe financial pressure.The writer's attitude to Tesco can be said to be ______.【单选题】A.biased。
职称英语考试《理工类》章节练习题精选及答案0517-88
职称英语考试《理工类》章节练习题精选及答案0517-881、Seeing Red Means Danger AheadThe color red often means danger and by paying attention, accidents can be prevented. In the future, the color red also may help prevent danger at construction sites. Thanks to new work by engineers, bridge supports or other kinds of materials could one day contain a color switching material. It will turn red ______ a structure collapses or falls apart.The secret behind the color switching material is a particular type of molecule. A molecule is a group of atoms held together by chemical bonds. Molecules come at all shapes and sizes, and make up everything. You can see, touch or feel. How a molecule behaves depends on what kinds of atoms it contains, and how they're held together.When a polymer (聚合物) containing a color switching molecule called a mechanophore (机械响应性聚合物) which is about to break, it produce a color. When a polymer with mechanophore molecules becomes "injured" or weak, one ofthe mechanophore bonds breaks and the material turns red. "It's a really simple detection method. "says Nancy Sottos, one of the scientists who worked on the project. Sottos and her team tested the color switching polymers in their lab. The test results proved encouraging.There is a way to get rid of the color light when a bright light is shone on the mechanophore.The broken bond is fixed and the red color disappears. This "self-healing" may be a problem for engineers. They need to use the color changer in big construction projects that will be outside in sunlight. And sunlight will make the mechanophore's warming system useless. Sottos and her fellow scientists still have a lot of work to do before the color switching molecules can be used outside the lab.【单选题】A.untilB.althoughC.afterD.before正确答案:D答案解析:本句意为当建筑物要倒塌时，它会变成红色。
职称英语等级考试试题答案及题解
年职称英语等级考试试题答案及题解理工类(级)试题第部分：词汇选项(第～题，每题分，共分)下面共有个句子，每个句子中均有个词或短语画有底横线，请从每个句子后面所给的个选项中选择个与画线部分意义最相近的词或短语。
请将答案涂在答题卡相应的位置上。
．.．. .. .. .. .．．．．．．．第部分：阅读判断(第～题，每题分，共分)阅读下面这篇短文，短文后列出了个句子，请根据短文的内容对每个甸子做出判断。
如果该句提供的是正确信息，请在答题卡上把涂黑；如果该句提供的是错误信息，请在答题卡上把涂黑；如果该句的信息文章中没有提及，请在答题卡上把涂黑。
?‘’(科学家) ．．．，．，．(等式) (嘶嘶响) ．．’．’’．．，．’．，．．．．．．．．．第部分：概括大意与完成句子(第卜题，每题分，共分)阅读下面这篇短文，短文后有项测试任务：()第题要求从所给的个选项中为第～段每段选择个正确的小标题；()第题要求从所给的个选项中选择个正确选项，分别完成每个句子。
请将答案涂在答题卡相应的位置上。
(克隆)：?. ，．，(牛犊) ．，：“，”．’，．，：”．’’，．，．，．?(轰炸) ，，．，．5. ．，．, (赞成克隆的人)．第部分：阅读理解(第～题，每题分，共分)下面有篇短文，每篇短文后有道题，每道题后面有个选项。
请根据文章的内容从每题所给的个选项中选择个最佳答案，涂在答题卡相应的位置上。
第一篇．“．”，,．!. ．．’．’，。
．，”’! ．’．．’’．.，，,’：“. ．．”，‘‘．．．’’．，，’’．“'’‘‘”．‘‘”．“”“”．．．．?．．．．’’．．．第二篇’ ’：’(连续不断的)’ ’．，’. ，(传感器) ，’．，’．“”，，，, ．.，“’’“ —” .. “(随意的)：，”，．，. ，．，’．’ ，．“(障碍)，”．．．．．．．．．．，．．’．．．．．第三篇，，．，,. ，. ，，—．．(火山口). ,. . ，‘’．，，．，，．，，. ，．，，(滑坡)，．，，. ，，．，．，．，，．，．, ．．．. ，(警报) ．,．?．．?．．．．．．．?．．第部分：补全短文(第～题，每题分，共分)阅读下面的短文，文章中有处空白，文章后面有组文字，请根据文章的内容选择组文字，将其分别放回文章原有位置，以恢复文章原貌。
职称英语考试《理工类》章节练习题精选及答案0517-138
职称英语考试《理工类》章节练习题精选及答案0517-138Why 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 productionbecause more coffee bushes can be planted if there aren't any trees. With increased production come increased profits.Unfortunately, deforesting for coffee production immediately decreases local-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 the birds eat the poisoned insects and also die. The chemicals kill orsicken 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.。
理工类职称英语试题及答案
理工类职称英语试题及答案理工类职称英语试题及答案第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 control3 Practically 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 disea ses 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 these pr oblems 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 theymiss the opportunity to have problems caught early before they develop 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 mentioned21 The 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第3部分：概括大意与完成句子(第23～30题，每题1分，共8分)下面的短文后有2项测试任务：(1)第23～26题要求从所给的6个选项中为第1～4段每段1选择个最佳标题;(2)第27～30题要求从所给的6个选项中为每个句子确定1个最佳选项。
职称英语考试《理工类》章节练习题精选及答案0517-19
职称英语考试《理工类》章节练习题精选及答案0517-191、Radiocarbon DatingNowadays 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 developed in the late 1940s 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 a 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 thesample being dated.Carbon - 14 is produced in the Earth's atmosphere when nitrogen(氮) - 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.Nowadays many scientists depend on radiocarbon for dating age - old objects.【单选题】A.RightB.WrongC.Not mentioned正确答案:A答案解析:本题难度不大，答案依据比较明显，主要答案依据在文章第一段第一段：Now-adays scientists can answer many questions about the past through a technique called radiocarbon，or carbon - 14 dating，谈到现在科学家可以通过一种叫做放射性碳定年法来解读过去，题干是其近义解释，所以正确，答案是A。
职称英语考试《理工类》章节练习题精选及答案0517-49
职称英语考试《理工类》章节练习题精选及答案0517-491、Cell Phones1. Believe it or not, cell phones have been around for over a quarter of a century. The first commercial cell phone system was developed by the Japanese in 1979, but cell phones have changed a lot since that time. The early cell phones were big and heavy but they have developed into small and light palm sized models. There are huge developments in their functions, too. We have had call forwarding, text messaging, answering services and hands - free use for years, but now there are new facilities, such as instant access to the Internet and receiving and sending photos.2. Cell phones have become very common in our lives. Recent statistics suggest one in three people on the planet now have cell phone, and most of them say they couldn't live without one, Cell phones are used in every area of our lives and have become a necessary tool, used for essential arrangements, social contact and business. It easier to call for help on thehighway. It possible to keep in touch with people "on the move" when people are traveling.3. Cell phones have made communication easier and have reduced the need for family arguments f We can use cell phones to let our family know we'll be late or if there's a sudden change of plan or an emergency. Cell phones have eased the worries of millions of parents when their teenagers are out late. They can now contact their children at any time.4. This does not mean that cell phones are all good news. Cell phones have brought with them a number of new headaches for their owners. It costs a lot to replace stolen phones, It is becoming a frequent occurrence, and have you ever seen such a huge phone bills? More serious, however, Cell phones bring the potential health problem. There are fears that radiation from the phones may cause brain tumor(肿瘤). This may be a time bomb waiting to happen to younger people who have grown up with cell phones. They simply can't live without cell phones!In spite of many benefits, cell phones have brought for their owners ______.【单选题】A.a necessityB.an emergencyC.a number of new headachesD.family argumentsE.big and light palm - sized modelsF.countless new facilities正确答案:C答案解析:本题难度不大，答案依据比较明显，答案依据是第四段第二句：They have brought with them a number of new headaches for their owners.很明显答案是C。
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职称英语考试《理工类》章节练习题精选及
答案0517-42
1、What are my chances of promotion if I stay here?【单选题】
A.retirement
B.advertisement
C.advancement
D.replacement
正确答案:C
答案解析:如果我还待在这干，我有升职的机会吗？promotion指“提升，晋级”，和advancement的引申意义“晋
升”是同义词，A项指“退休”，B项指“广告”，D项指“代替”，三项的干扰性不强。
本题考查的是advancement的引申意义，有一定难度。
2、I don't quite follow what she is saying. 【单选题】
A.believe
B.understand
C.explain
D.accept
正确答案:B
答案解析:follow此处有“理解”的意思，相当于understand; believe：相信；explain:解释；accept:接受。
3、Man cannot exit without water. 【单选题】
A.expand
B.rise
C.live
D.quit
正确答案:C
答案解析:exist:存在，和live（生活、活着）意思相近；expand:拓展；rise:升起；quit:退出、放弃。
4、It's prudent to start any exercise program gradually at first.【单选题】
A.workable。