2020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), 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 the sample 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.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，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。

2、Strike in MTV NetworksScores of workers from MTV Networks walked off the job yesterday afternoon, filling the sidewalk outside the headquarters of its corporate parent, Viacom, to protest recent changes in benefits. The walkout highlighted the concerns of a category of workers who are sometimes called permalancers： permanent freelancers who work like full-time employees but do not receive the same benefits.Waving signs that read "Shame on Viacom", the workers, most of them in their 20s, demanded that MTV Networks reverse a plan to reduce health and dental benefits for freelancers beginning Jan. 1. In a statement, MTV Networks noted that its benefits program for full-time employees had also undergone changes, and it emphasized that the plan for freelancers was still highly competitive within the industry. Many freelancers receive no corporate benefits. But some of the protesters asserted that corporations were competing to see which could provide the most mediocre health care coverage. Matthew Yonda, who works at Nickelodeon, held a sign that labeled the network "Sick-elodeon". "I\'ve worked here every day for three years-I\'m not a freelancer," Mr. Yonda said. "They just call us freelancers in order to bar us from getting the same benefits as employees."The changes to the benefits package were announced last Tuesday. Freelancers were told that they would become eligible for benefits after 160 days of work, beginning in January. While that eased previous eligibility rules, which required freelancers to work for 52 weeks before becoming eligible, it would have required all freelancers not yet eligible for benefits to start the waiting period over again on Jan. 1. The 401 (k) plan was also removed On Thursday, acknowledging the complaints, MTV Networks reinstated the 401 (k) plan and said freelancers who had worked consistently since March would be eligible.Fueled by a series of blog posts on the media web site Gawker-the first post was headlined "The Viacom Permalance Slave System" -a loose cohort of freelancers created protest stickers and distributed walkout fliers last week. Caroline O\'Hare, a unit manager who has worked for MTV for more than two years, said the new health care plan-with higher deductibles and a $ 2,000 cap on hospital expenses each year-had provoked outrage. "They think they can treat us like children that don\'t have families, mortgages or dreams of retirement," she said.Outside Viacom\'s headquarters, several workers held posters with the words, "There\'s too many of us to ignore." It was unclear how many freelancers are on the company\'s payroll; an MTV Networks spokeswoman said the figure was not known because it rises and falls throughout the year. The company has 5,500 full-time employees, excluding freelancers, around the world.Two freelancers and one full-time employee, who asked not to be identified for fear of retribution, estimated that the percentage of freelancers in some departments exceeded 75 percent. Another labor action is expected to take place outside Viacom later this week. Members of the Writers Guild of America, who have been on strike for five weeks, are expected to picket there on Thursday.The word "reinstate" (line 6, paragraph 3) most probably means ______.【单选题】

A.redesign

B.restore

C.repair

D.reset

正确答案:B

答案解析:猜词题。看到这个单词的前缀re，就应该断定这个单词含有“重新”或“重复”的含义，再根据题干返回原文定位，401方案被取消，遭到员工的抗议，MTV又恢复了该方案，故正确答案为B。

3、The SmogFor over a month, Indonesia was in crisis. Forest fires raged out of control as the country suffered its worst drought for 50 years. Smoke from the fires mixed with sunlight and hot dry air to form a cloud of smog. This pollution quickly spread and within days it was hanging over neighboring countries including Malaysia, Singapore and Thailand. When the smoke combined with pollution from factories and cars, it soon became poisonous. Dangerous amounts of CO became trapped under the smog and pollution levels rose. People wheezed (喘息) and coughed as they left the house and their eyes watered immediately. The smog made it impossible to see across streets and whole cities disappeared as grey soot(烟灰) covered everything. In some areas, water was hosed (用胶管浇) from high-rise city buildings to try and break up the smog. Finally, heavy rains, which came in November. Put out the fires and clear the air. But the environmental costs and health problems will remain. Many people from South-Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes and factory pollution Breathing problems could well increase and many non-sufferers may have difficulties for the first time. Wildlife has suffered too. In lowland forests, elephants, deer, and tigers have been driven out of their homes by smog. But smog is not just an Asian problem. In fact. was world was first used in London in 1905 to describe the mixture of smoke and thick fog. Fog often hung over the capital. Sometimes the smog was so thick and poisonous that people were killed by breathing problems or in accidents. About 4, 000 Londoners died within five days as a result of thick smog in 1952. The word "smog" first appeared in 1952. 【单选题】

A.Right

B.Wrong

C.Not mentioned

正确答案:B

答案解析:题句的意思是smog这个词最早出现于1952年。最后一段提到这个词是在1905年首次出现的。题句意思与原文不符，故选B。

4、The high - speed trains can have a major impact on our lives.【单选题】

A.effort

B.problem

C.influence

D.concern

正确答案:C

答案解析:高铁会对我们的生活产生很大影响。本题难度不大，是送分题，干扰项可以说无干扰性，确定impact的引申意义有“影响”的意思，不难找到答案influence，

5、The Value of AdvertisementMoney spent on advertising is worth spending. It serves directly to bring about a rapid sale of goods at reasonable prices, so setting up a firm home market and making it possible to provide for export at good price. By drawing attention to new ideas it helps greatly to raise standards of living. By helping to increase demand it causes an increased need for labor, and is therefore a nice way to fight unemployment. It lowers the costs of many services: without advertisements your daily newspaper would cost four times as much, the price of your television program would need to be doubled, and travel by bus or subway would cost more. And perhaps most important of all, advertising provides a promise of reasonable value in the products and services you buy. Besides the fact that twenty-seven Acts of Parliament govern the terms of advertising, no regular advertiser dare produce anything that fails to live up to the promise of his advertisements. He might fool some people for a little while through misleading advertising. He will not do so for long, for the public has the good sense not to buy the poor goods more than once. If you see a product frequently advertised, it is the proof I know that the product does what is promised for it, and that it has good value. Advertising does more for the good of the public than any other force I can think of. There is one more point I feel I ought to touch on. Recently I heard a well-known television person declare that he was against advertising because it persuades rather than informs. He was telling us the real difference. Of course advertising tries to persuade. If its messages were nothing but information, that would be difficult to get more people to buy, for even the choice of the color of a shirt is a bit persuasive-advertising would be so boring that no one would pay any attention. But perhaps that is what the well-known television person wants.It seems to the writer that____.【单选题】

A.it is very difficult to get all the information from advertising

B.there is nothing wrong with advertising in persuading the buyers

C.advertising is usually very boring and misleading

D.people will pay attention to the color of a shirt rather than advertising

正确答案:B

答案解析:根据最后一段，如果广告只有告知作用而没有说服作用，人们就不会注意，就不可能有购买欲望。因此选B。