2022年职称英语考试《理工类》考试共65题，分为单选题和多选题和判断题和计算题和简答题和不定项。小编每天为您准备了5道每日一练题目（附答案解析），一步一步陪你备考，每一次练习的成功，都会淋漓尽致的反映在分数上。一起加油前行。

1、Radiocarbon DatingNowadays scientists can answer many questions about the past through a technique called radiocarbon (放射性碳), ｏｒcarbon - 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, ｏｒC - 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 detectｏｒａｎｄ　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(氮) - 14, ｏｒN - 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 fｏｒdating 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 fｏｒdating age - old objects.【单选题】

A.Right

B.Wrong

C.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，ｏｒcarbon - 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。

2、Shopping at Second - hａｎｄ　Clothing StoresWhen 33 year old Pete Barth was in college, shopping at second hａｎｄ　clothing stores was just something he did- "like changing the tires on his car." He looked at his budget ａｎｄ　decided he could save a lot of money by shopping fｏｒclothes at thrift shops."Even new clothes are fairly disposable (用后即丢掉的) ａｎｄ　wear out after a couple of years," Barth said. "In thrift shops, you can find some great stuff whose quality is better than new clothes."Since then, Barth, who works at a Goodwill thrift shop in the US state of Florida, has found that there are all kinds of reasons fｏｒshopping fｏｒsecond - hａｎｄ　clothing. Some people, like him, shop to save money. Some shop fｏｒa crazy - looking shirt. ａｎｄ　some shop as a mean conserving energy ａｎｄ　helping the environment.Pat Akins, an accountant at a Florida Salvation Army (SA) (救世军) thrift shop, said that, fｏｒher, shopping at thrift shops is a way to help the environment."When my daughter was little, we looked at it as recycling," Akins said. "Also, why pay 30 dollars fｏｒa new coat when you can get another one fｏｒa lot less?"Akins said that the SA has shops all over the US- "some as big as department stores. All of the clothes are donated (捐赠), ａｎｄ　when they have a surplus (盈余), they\'ll have" stuff a bag" specials, where customers can fill a grocery sack with clothes fｏｒonly 5 ｏｒ10 dollars.Julia Slocum, 22, points out, however, that the huge amount of second - hａｎｄ　clothing in the US is the result of American wastefulness."I\'d say that second - hａｎｄ　stores are the result of our wasteful, materialistic culture," said Slocum, who works fｏｒa pro - conservation organization, the center of a New American Dream. "Thrift shops prevent that waste from going to landfills (垃圾填埋场). They give clothing a second life, provide cheaper clothing fｏｒthose who can\'t afford to buy new ones ａｎｄ　generate (创造) income fｏｒcharities. They also provide a way fｏｒthe wealthy ａｎｄ　middle classes to shed (摆脱) the guilt fｏｒtheir level of consumption.Thrift shops can do everything EXCEPT ______. 【单选题】

A.give clothing a second life

B.generate income fｏｒcharities

C.provide cheaper clothes fｏｒthe poor

D.stop rich people from wasting money

正确答案:D

答案解析:本题有一定难度，需要认真阅读文章，答案依据在文章最后一段。最后一段谈到，旧货店给了服装二次生命，给那些买不起新衣服的人提供便宜衣服，还把一些收入捐给慈善机构，但没有提到阻止富人浪费钱，所以答案是D。

3、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 fｏｒpeople. 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 to use 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 fｏｒpaying 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 fｏｒthe same amount of time.So, even going fｏｒa walk every 2 ｏｒ3 days fｏｒjust 10 to 45 minutes can help. That should be good news fｏｒthe 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 fｏｒa walk ｏｒrun around with friends. Whatever you do, though, don\'t try to read ａｎｄ　walk at the same time. You could end up hurting yourself!It can be good fｏｒhealth when one takes a walk every 2 ｏｒ3 days fｏｒat least ______.【单选题】

A.3 minutes

B.45 minutes

C.30 minutes

D.10 minutes

正确答案:D

答案解析:本题有一定难度，需要认真阅读文章。答案依据在文章第七段。带着题干信息词回到文章定位。第七段第一句谈到，每两三天出去散步10到45分钟会对健康有益，回来看选项，很明显，D是近义解释，是答案。

4、Genetically Modified FoodEuropean ｕｎｉｏｎenvironmental officials have determined that two kinds of genetically modified corn could harm butterflies, affect food chains ａｎｄ　disturb life in rivers ａｎｄ　streams, ａｎｄ　they have proposed a ban on the sale of the seeds, which are made by Dupont Pioneer, Dow Agrosciences ａｎｄ　Syngenta. The preliminary decisions are circulating within the European Commission, which has the final say. Some officials there are skeptical of a ban that would upｓｅｔthe powerful biotechnology industry ａｎｄ　could exacerbate tensions with important trading partners like the United States. The seeds are not available on the European market fｏｒcultivation.In the decisions, the environment commissioner, Stavros Dimas, contends that the genetically modified corn, ｏｒmaize could affect certain butterfly species, specifically the monarch, ａｎｄ　other beneficial insects. Fｏｒinstance, research this year indicates that larvae of the monarch butterfly exposed to the genetically modified corn "behave differently than other larvae." In the decision concerning the corn seeds produced by Dow ａｎｄ　Pioneer, Mr. Dimas calls "potential damage on the environment irreversible." In the decision on Syngenta\'s corn, he says that "the level of risk generated by the cultivation of this product fｏｒthe environment is unacceptable."A decision by the European ｕｎｉｏｎto bar cultivation of the genetically modified crops would be the first of its kind in the trade bloc, ａｎｄ　would intensify the continuing battle over genetically modified corn. Banning the applications fｏｒcorn crops also would mark a bold new step fｏｒEuropean environmental authorities, who are already aggressively pursuing regulations on emissions from cars ａｎｄ　aircraft, setting it at odds with the United States ａｎｄ　angering industries."These products have been grown in the U. S. ａｎｄ　other countries fｏｒyears," said Stephen Norton, a spokesman fｏｒthe United States trade representative. "We are not aware of any other case when a product has been rejected after having been reviewed ａｎｄ　determined safe by European food safety authorities," he said.Barbara Helfferich, a spokeswoman fｏｒMr. Dimas, declined to comment on the specifics of the procedure because commissioners had not yet made a final decision. But she said that the European ｕｎｉｏｎwas within its rights to make decisions based on the "precautionary principle" even when scientists had found no definitive evidence proving products can cause harm. She said that the decisions by Mr. Dimas could go before the commission within a few weeks, but she said that no date had been set. In the decisions, Mr. Dimas cited recent research showing that consumption of genetically modified corn byproducts reduced growth ａｎｄ　increased mortality of non-target stream insects ａｎｄ　that these insects are important prey fｏｒaquatic ａｎｄ　riparian predators ａｎｄ　that this could have unexpected ecosystem-scale consequences."Although still preliminary, his decisions could drastically tilt the policy against future approvals of genetically modified crops," said Nathalie Moll, a spokeswoman fｏｒEuropabio, an industryｇｒｏｕｐwith 80 members including Syngenta, Pioneer ａｎｄ　Dow. Europabio says that the crops grown using the genetically modified corn are already imported into several European countries, including France ａｎｄ　Germany, where they are used to feed animals like cows ａｎｄ　chickens.Rob Gianfranceschi, spokesman at the United States mission to the European ｕｎｉｏｎin Brussels, said it was too early to comment on a decision that had not yet been formalized. But he made clear that the United States remained frustrated with European policies on genetically modified crops.To the decisions, the European Commission officials\' attitudes are ______.【单选题】

A.skeptical

B.controversial

C.contradictory

D.divergent

正确答案:D

答案解析:态度题。题干考查的是欧洲委员会官员对于这些决议的态度。文中表示一些官员对禁令表示怀疑，主要害怕禁令会影响外交关系；而一些官员表示支持，可见这些官员所持的态度是有分歧的。考生可能会受到选项B的干扰，比较看来，选项D更为精确。

5、One Good Reason to Let Smallpox LiveIt\'s now a fair bet that we will never see the total extinction (灭绝) of the smallpox (天花) virus. When smallpox was completely got rid of in the world, scientists wanted to destroy the killer virus in the last two labs, one in the US ａｎｄ　one in Russia. They asked: If smallpox has truly gone from the planet, what point was there in keeping these reserves?In reality, of course, it was naive to imagine that everyone would let go of such a powerful potential weapon. Undoubtedly several nations still have a few vials (小药瓶). ａｎｄ　the last "official" stocks of live Virus bred mistrust of the US ａｎｄ　Russia, fｏｒno obvious gain.Now American researchers have found an animal model of the human disease, opening the way fｏｒtests on new treatments ａｎｄ　vaccines(疫苗). So once again there\'s a good reason to the virus, just in keep the disease puts in a reappearance.How do we case with the mistrust of the US ａｎｄ　Russia? _____. Keep the virus Simple international support in a well - guarded UN laboratory that\'s open to all countries. The US will object, of course, just as it with a multilateral (多边的) approach to just about everything. But it doesn\'t mean the idea is rejects. If the virus is useful, then let\'s wrong it the servant of all humanity make not just a part of it.【单选题】

A.handle

B.tackle

C.treat

D.deal

正确答案:D

答案解析:本题难度不大，考查动词短语deal with的用法，deal with指“处理”，也是固定搭配，答案是D。