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Anthropology
1. Anthropology is the holistic «science of man». The discipline deals with the integration of different aspects of the social sciences, humanities, and human biology. Anthropology includes archaeology, prehistory, physical or biological anthropology, anthropological linguistics, social and cultural anthropology, ethnology and ethnography. The word anthropos is from the Greek for «human being» or «person». Eric Wolf described sociocultural anthropology as «the most scientific of the humanities, and the most humanistic of the sciences».
2. The goal of anthropology is to provide a holistic account of humans and human nature. Since anthropology arose as a science in Western societies that were complex and industrial, a major trend within anthropology has been a methodological drive to study peoples in societies with more simple social organization, sometimes called «primitive» in anthropological literature, but without any connotation of «inferior». Today, most anthropologists use terms such as «less complex» societies or refer to specific modes of subsistence or production, such as «hunter-gatherer» or «forager» or «simple farmer» to refer to humans living in non-industrial, non-Western cultures, such people or folk (ethnos) remaining of great interest within anthropology.
3. The quest for holism leads most anthropologists to study a particular folk or people in detail, using biogenetic, archaeological, and linguistic data alongside direct observation of contemporary customs. In the 1990s and 2000s, calls for clarification of what constitutes a culture, of how an observer knows where his or her own culture ends and another begins, and other crucial topics in writing anthropology were heard. It is possible to view all human cultures as part of one large, evolving global culture.
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Marketing Magic
1. Why would anyone who lives in a city where the drinking water is clean, good-tasting, and free of charge pay $1.50 for a glass of bottled water? Odd though it may seem, this is a daily occurrence in New York City and has been since 1977, when Perrier water was first introduced in the United States. Perrier, a lightly carbonated water from the south of France, is chic. It became that way because the company that bottles Perrier had a very smart marketing strategy.
2. A marketing strategy is a plan for presenting a product so that it will be as attractive as possible to potential buyers, regardless of any intrinsic merits the product may have. Before Perrier came to the United States, Americans rarely drank bottled water, and then only when they feared the local water supply was contaminated. But the Perrier people changed that by appealing to Americans who were highly conscious of three things: health, weight, and fashion. Perrier was presented as a sparkling, natural drink, free of alcohol and other dangerous chemicals. But not only was it good for you, it was French. Therefore it was sophisticated as only a French drinking water could be. With this strategy, Perrier sold over 40 million bottles of water in the United States in one year.
3. Another example of marketing magic is "designer jeans." For over a hundred years, miners, farmers, and cowboys have worn jeans because they were made of sturdy blue denim that didn't wear out. They were simply the best work pants in the world.
4. But a Hong Kong businessman, Mohan Murjani, wasn't interested in selling something practical and durable. For him, jeans were a marketing problem and he wanted a new way of presenting them to the public. He decided to make a new kind of jeans, not for working cowboys, but for people who wanted to look glamorous. And Murjani succeeded. By 1978, 17% of all jeans sold were tight-fitting designer jeans. They cost no more to make than cowboy jeans, but they sold for four or five times as much. Why? Because people will pay more for fashion than they will for work clothes. And if the marketing strategy is right, anything can be made fashionable.
(World English)
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A Satellite Telephone
1. A satellite telephone, satellite phone, or satphone is a type of mobile phone that connects to orbiting satellites instead of terrestrial cell sites. They provide similar functionality to terrestrial mobile telephones: voice, short messaging service and low-bandwidth Internet access are supported through most systems. Depending on the architecture of a particular system, coverage may include the entire Earth, or only specific regions. The mobile equipment, also known as a terminal, varies widely.
2. Early satellite phone handsets had a size and weight comparable to that of a late-1980s or early-1990s mobile phone, but usually with a large retractable antenna. More recent satellite phones are similar in size to a regular mobile phone while some prototype satellite phones have no distinguishable difference from an ordinary smartphone. Satphones are popular on expeditions into remote areas where terrestrial cellular service is unavailable.
3. Since satellite phones are purpose-built for one particular network and cannot be switched to other networks, the price of handsets varies with network performance. If a satellite phone provider encounters trouble with its network, handset prices will fall, then increase once new satellites are launched. Similarly, handset prices will increase when calling rates are reduced.
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Automation
1. Automation is the use of control systems in concern with other applications of information technology to control industrial machinery and processes, reducing the need for human intervention. In the scope of industrialization, automation is a step beyond mechanization.
2. Automation plays an increasingly important role in the world economy and in daily experience. Engineers strive to combine automated devices with mathematical and organizational tools to create complex systems for a rapidly expanding range of applications and human activities.
3. Many roles for humans in industrial processes presently lie beyond the scope of automation. Tasks requiring subjective assessment or synthesis of complex sensory data, such as scents and sounds, as well as high-level tasks such as strategic planning, currently require human expertise. In many cases, the use of humans is more cost-effective than mechanical approaches even where automation of industrial tasks is possible.
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Prosperity Decade
1. The 1920s were a period of great change in American life that lasted nearly ten years. The First World War had just ended, and a time of gay abandon, economic prosperity, and social change had set in. An unpopular prohibition law made it seem that breaking the law could be acceptable and even commonplace. The tone of the times was one of excitement, of excesses, of new freedom.
2. During the 1920s many people made money by buying shares, or stocks, in different companies. The price of a company's stock depends on business condition. If many buyers want to buy stock in a company, the price of the stock will rise. If many stock owners want to sell their stock, the price will go down. In the 1920s stock prices seemed to go in only one direction: up. There were stories of shoeshine boys and office workers who made fortunes in the stock market in one day.
3. People were making more money than ever before. Companies used advertising to encourage people to buy their products. Advertising became important to business during the 1920s. Another way of encouraging people to buy more goods was called instalment buying. When people bought a thing on the instalment plan, they had to pay only a small part of the total price for the thing. Each month they paid another small some, called an instalment. People paid instalments until they had paid the whole price of the thing they had bought.
4. People were earning a lot of money, and the system of instalment buying seemed a good idea. But some experts warned that too many Americans owed too much money. If people suddenly lost their jobs, they would not be able to pay their debts. Then business would suffer. But few people listened to these warnings. Business was expanding. People kept buying on the instalment plan. The golden years were up to 1929 - and then came Black Tuesday, the day of October 1929 of the inevitable stock market crash, that spanned ten years.
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The aims of law
1. Law has several aims. They are all concerned with making society more stable and enabling people to flourish. The law forbids certain ways of behaving like murder, libel, and requires others, like paying income tax. If people disobey the rules the law threatens them with something unpleasant (other called a sanction), like being punished or having to pay compensation. The idea is that within this framework of do’s and don’ts people can live more securely. If they are more secure they will treat one another better.
2. A second aim is the following. Laws guarantee to people who buy and sell goods, make wills, take employment, form companies and so on that the state will if necessary enforce these arrangements.
3. A third aim is to settle disputes about what the law is and whether it has been broken. Taking these three aims together, we see that law not only threatens those who do what it forbids but promises to protect people’s interests. It imposes restrictions on them but also gives them certain guarantees.
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Human perception of motion
1. A television system involves equipment located at the source of production, equipment located in the home of the viewer, and equipment used to convey the television signal from the producer to the viewer. The purpose of all of this equipment is to extend the human senses of vision and hearing beyond their natural limits of physical distance.
2. A television system must be designed, therefore, to embrace the essential capabilities of these senses, particularly the sense of vision. The aspects of vision that must be considered include the ability of the human eye to distinguish the brightness, colours, details, sizes, shapes, and positions of objects. Aspects of hearing include the ability of the ear to distinguish the pitch, loudness, and distribution of sounds.
3. In working to satisfy these capabilities, television systems must strike appropriate compromises between the quality of the desired image and the costs of reproducing it. They must also be designed to override, within reasonable limits, the effects of interference and to minimize visual and audial distortions in the transmission and reproduction processes.
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The jury
1. In England a person accused of crime must always be presumed innocent until he has been proven guilty. If a criminal case is serious it is always investigated with a jury. What is a jury and how does it function?
2. There are 12 members of the jury both men and women. There are quite a lot of people in England who think that 12 ordinary men and women are not capable of understanding properly all the evidence given at criminal trials. But there is no doubt about it because judges are great experts in summing up the evidence. The judge calls the jury's attention to all most important points in the evidence. He favoures neither prosecution nor defence. The members of the jury decide only the questions of fact. Questions of law are for the judge. The jury retire to a private room to consider the verdict. If the jury cannot agree, they must be discharged and a new jury is formed.
3. A verdict has to be unanimous. English law requires that the guilt of an accused man must be proved 'beyond reasonable doubt'. When the jury return to the courtroom, they have to give only one answer "Guilty" or "Not guilty".
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ASSEMBLY LINE
1. An assembly line is industrial arrangement of machines, equipment, and workers for continuous flow of workpieces in mass-production operations. It is designed by determining the sequences of operations for manufacture of each product component as well as the final product. Each movement of material is made as simple and short as possible. Work assignments, numbers of machines, and production rates are programmed so that all operations performed along the line are compatible.
2. An automotive assembly line starts with a bare chassis; components are attached successively as the growing assemblage moves along a conveyor. Parts are matched into subassemblies on feeder lines that intersect the main line to deliver body parts, engines, and other assemblies. As the units move past, each worker along the line performs a specific function. Each part and tool is delivered to its point of use in synchronisation with the line. A number of different assemblies are on the line simultaneously, but an intricate system of scheduling and control ensures that the appropriate body type and colour, trim, engine, and optional equipment arrive together to make the desired combinations.
3. Automated assembly lines consist entirely of machines run by machines. In such continuous-process industries as petroleum refining and chemical manufacture and in many modern automobile-engine plants, assembly lines are completely mechanised and consist almost entirely of automatic, self-regulating equipment.
4. Most products, however, are still assembled by hand because many component parts are not easily handled by a simple mechanism. The number of products automatically assembled is steadily increasing but at a low rate because a product must be designed for automatic assembly and must be accurately and consistently manufactured. Expensive and somewhat inflexible, automatic assembly machines are economical only if run at very high outputs. However, the development of versatile automatic machinery and industrial robots is increasing the flexibility of fully automated assembly operations.
(Encyclopedia Britannica)
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Profession d'ingénieur aujourd'hui
1. La profession d'ingénieur est issue de deux importants courants européens des XVIIIe et XIXe siècles: la révolution industrielle et la fiabilité croissante de la science. À mesure que la production industrielle des usines surpasse celle des artisans et des hommes de métier, le champ d'activité de l'ingénierie et la demande de personnes qualifiées en ingénierie augmentent grandement. La science devient le principal moyen du progrès technique, permettant aux ingénieurs de prédire le comportement des matériaux et des forces physiques avec une précision croissante.
2. Durant cette période, des écoles d'ingénierie naissent dans le monde entier; les disciplines spécialisées de l'ingénierie commencent à se développer et préparent le terrain à l'explosion des connaissances techniques du XXe siècle.On estime maintenant que le volume des connaissances scientifiques et techniques double tous les 20 ans ou moins.
3. Comme plus personne ne peut posséder toutes les connaissances propres à un domaine particulier, l'ingénieur d'aujourd'hui travaille le plus souvent au sein d'une équipe technique comprenant des scientifiques, des technologues, des techniciens et d'autres spécialistes.
4. Donc, en plus d'avoir une formation en mathématiques, en physique, en analyse de systèmes, en chimie et dans d'autres sciences requises par leur discipline particulière, les ingénieurs doivent acquérir des talents de communicateurs pour travailler efficacement en équipe. Comme leur travail nécessite des compromis entre les exigences économiques, de performances, de compatibilité avec des systèmes existants, environnementales et d'autres facteurs, les ingénieurs doivent aussi avoir un bon jugement, être créatifs et fins diplomates pour mieux utiliser les matériaux et les ressources limitées, tant énergétiques qu'humaines.
Bien que le rythme rapide de l'avancement technique génère de nouveaux champs de spécialisation en ingénierie, la plupart de ceux-ci sont liés au moins à l'une des branches principales, qui comprennent le génie agricole, le génie chimique, le génie civil, le génie électrique, le génie méchanique, le génie minier et l' arpentage ainsi que les champs brièvement abordés ci-dessous.
http://www.thecanadianencyclopedia.com
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Cognitive theories
1. Cognitive theories are appropriate to the school situation, for they are concerned with knowing and thinking. They assume that perceiving and doing, shown in manipulation and play, precede the capacity to symbolize, which in turn prepares for comprehensive understanding. Although the sequence of motor-perceptual experience followed by symbolic representation has been advocated for a long time, Jean Piaget offered the first penetrating account of this kind of intellectual growth. His views have exercised great influence on educators.
2. Cognitive theories of learning also assume that the complete act of thought follows a fairly common sequence, as follows: arousal of intellectual interest; preliminary exploration of the problem; formulation of ideas, explanations, or hypotheses; selection of appropriate ideas; and verification of their suitability.
3. Teaching based on cognitive theories of learning recognizes, first, the growth in quality of intellectual activity and capitalizes on this knowledge by organizing instruction to anticipate the next stage in development but does not await it; otherwise there would be no instruction; i.e., instruction should pace development but not outstrip it. Second, it seeks to tune the learning situation to the sequences of the complete act of thought and to arrange, simplify, and organize the subject matter accordingly. Some educators emphasize strongly the arousal phase; in many modern science curricula there is, thus, the idea of inquiry training, which tries to arouse in the child a spontaneous rather than a directed interest. Other educators are concerned more with the middle intellectual phases of the thinking sequence — especially the playing with hypotheses or hunches and the working with organizing ideas and concepts.
4. Once started, the motivation of cognitive learning depends less on notions of reinforcement and more on standards of intellectual achievement generated by the learner himself. Accordingly, the learner may begin to have aspirations and to set himself future standards that are influenced by his past performances and those of his fellows.
(Encyclopedia Britannica)
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Pricing Methods
1. Price is a very important weapon that can be used to persuade consumers to buy. Price is one of many factors that determine the demand for a product. What are the most common pricing methods adopted by firms?
2. Cost-plus pricing is a very simple pricing method and is perhaps the most common. A firm may calculate its average costs of producing a product and simply add a profit «mark up», say 10 %, on to average costs. This mark-up could be changed to allow for the effects of competition and economic conditions, e.g. where there is a lot of competition this mark-up may be lowered or when business is good the mark-up could be raised.
3. Marginal-cost pricing differs from the above in that the firm looks not at its average costs but marginal costs, i.e. the firm calculates the additional cost of producing the next unit or set of units of output and the firm charges a price (plus a ‘mark-up’) according to the marginal cost. A typical example is found in the shoe repair business. There appear to be no standard prices for repairing shoes. What tends to happen is that the cobbler examines the shoes and makes a quick estimate of how much material and time it will take to repair them. Larger shoes, those made of leather and those in greater disrepair have a higher marginal cost and therefore a higher price is charged for their repair.
4. Price discrimination: several firms are able to charge different prices for a similar product. This is known as price discrimination. British Rail (BR), for example, charges different consumers such as businessmen and women, children, senior citizens and students different prices and also charges different prices according to the time of journey, e.g. peak, off-peak, weekly and week-end.
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Agriculture
1. Agriculture is the cultivation of animals, plants, fungi and other life forms for food, fiber, and other products used to sustain life. Agriculture was the key implement in the rise of sedentary human civilization, whereby farming of domesticated species created food surpluses that nurtured the development of civilization. The study of agriculture is known as agricultural science. Agriculture is also observed in certain species of ant and termite, but generally speaking refers to human activities.
2. The history of agriculture dates back thousands of years, and its development has been driven and defined by greatly different climates, cultures, and technologies. However, all farming generally relies on techniques to expand and maintain the lands suitable for raising domesticated species. For plants, this usually requires some form of irrigation, although there are methods of dryland farming; pastoral herding on rangeland is still the most common means of raising livestock. In the developed world, industrial agriculture based on large-scale monoculture has become the dominant system of modern farming.
3. Modern agronomy, plant breeding, pesticides and fertilizers, and technological improvements have sharply increased yields from cultivation, but at the same time have caused widespread ecological damage and negative human health effects. Selective breeding and modern practices in animal husbandry such as intensive pig farming have similarly increased the output of meat, but have raised concerns about animal cruelty and the health effects of the antibiotics, growth hormones, and other chemicals commonly used in industrial meat production.
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Henry Ford
1. Modern production methods took a giant leap forward in 1913 when Henry Ford introduced the use of the assembly line in the production of automobiles. In those days, workers simply picked a spot on the factory floor, and assembled the car from the bottom up. As business grew, Ford began manufacturing many of the component parts formerly purchased from suppliers. Typically, the components were put together by one worker who performed all the operations necessary to assemble them. The method was quite costly, and so only the wealthy could afford to buy automobiles in those days.
2. This did not please Henry Ford who wanted to bring the price of automobiles down to the point where most families could afford them. The key to achieving this goal, in Ford's view, was through the improvement of labour productivity. He needed to find a way to 1) limit the number of operations performed by each worker, 2) bring the work to the worker rather than the other way around, and 3) perform each operation in the most efficient sequence he could find. He found what he was seeking in his new creation: the assembly line.
3. Ford's first line, introduced in April 1913, was used to assemble generators. Working in the old way, one worker had been able to put together 25 to 30 generators in a 9-hour day. This translated to something around 20 minutes per assembly. The new line broke the operation into 29 steps performed by individual workers on parts that were brought to them by the steadily moving assembly line. The new process reduced assembly time to an average of 13 minutes per generator.
4. One year later, additional experimentation divided production into 84 operations and reduced assembly time to 5 minutes per generator. Assembly line methods brought the price of automobiles within the reach of millions of American families. Henry Ford was not an economist, but his assembly lines had changed dramatically both American households and its factories.
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INFORMATION SYSTEMS
1. The future of information systems may be gathered from several areas of current research. As all information carriers (text, video, and sound) can be converted to digital form and manipulated by increasingly sophisticated techniques, the ranges of media, functions, and capabilities of information systems are constantly expanding. Evolving techniques of natural-language processing and understanding, knowledge representation, and neural process modelling have begun to join the more traditional range of methods of content analysis and manipulation. The use of these techniques opens the possibility of receiving new knowledge from existing data.
2. Computer visualisation, a new field that has grown expansively since the early 1990s, deals with the conversion of masses of data coming from instruments, databases, or computer simulations into visual displays - the most efficient method of human information reception, analysis, and exchange.
3. Related to computer visualisation is the research area of virtual reality or virtual worlds, which denotes the generation of synthetic environments through the use of three-dimensional displays and interaction devices. A number of research directions in this area are particularly relevant to future information systems: knowledge-based world modelling; the development of physical analogues for abstract quantitative and organisational data; and search and retrieval in large virtual worlds.
4. Present-day computers are remarkably versatile machines capable of assisting humans in nearly every problem-solving task that involves symbol manipulations. Television, on the other hand, has penetrated societies throughout the world as a noninteractive display device for combined video and audio signals. The forthcoming convergence of three digital technologies - namely, the computer, very-high-definition television (V-HDTV), and data communications - is inevitable. In such a system, a large-screen multimedia display monitor, containing a 64-megabit primary memory and a billion-byte hard disk for data storage and playback, would serve as a computer and, over fibre links, an interactive television receiver.
(Encyclopedia Britannica)
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British Architecture in the Period of Ancient History
1. An Alpine race came to the British Isles about 1700 B.C. A characteristic monument of this civilization, primordially rude and primordially majestic, is the so-called Stonehenge, a sanctuary erected on Salisbury Plain about 1100 B.C. or some-what earlier. During the invasion of Celts tribes fortresses were built on hilltops, towns began to appear in the wealthier south-east, though they were at first no more than large groups of wattle-and-clay houses enriched by a sort of fortificated fence. The invasion by the Romans brought the country into contact with the Roman civilization. Major systems of fortifications were constructed as a defense.
2. Then came the occupation of the country by Anglo-Saxon tribes. The Anglo-Saxon had no big cities, only scattered villages and townships, that is, arrangements of the lord’s house with the wattle-and-mud huts of the villagers grouped round it. The huts were primitive affairs, of wood and clay with no chimney over the open hearth but a hole in the roof to let the smoke out and to let the light in. The hearth was usually nothing more complicated than just a large flat stone in the middle of the earthen floor.
3. The lord’s house had a large yard where much of the housekeeping work was done with lots of auxiliary buildings like sheds and barns and the like inside it. It was protected by a stout fence supplemented by a sort of circular fortification, or mound. The interior arrangements were characteristic: there was always a spacious hall where most of the family’s social life was spent, where the lord had his meals with his family and his guests. The light came through narrow holes in the walls covered with oiled linen.
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Parenting Styles
1. In authoritarian parenting style, children are expected to follow the strict rules established by the parents. Failure to follow such rules usually results in punishment. Authoritarian parents fail to explain the reasoning behind these rules. These parents have high demands, but are not responsive to their children. Authoritarian parenting styles generally lead to children who are obedient and proficient, but they rank lower in happiness, social competence and self-esteem.
2. Like authoritarian parents, those with an authoritative parenting style establish rules and guidelines that their children are expected to follow. However, this parenting style is much more democratic. Authoritative parents are responsive to their children and willing to listen to questions. When children fail to meet the expectations, these parents are more nurturing and forgiving rather than punishing. They want their children to be assertive as well as socially responsible, and self-regulated as well as cooperative. Authoritative parenting styles tend to result in children who are happy, capable and successful.
3. Permissive parents, sometimes referred to as indulgent parents, have very few demands to make of their children. These parents rarely discipline their children because they have relatively low expectations of maturity and self-control. Permissive parents are generally nurturing and communicative with their children, often taking on the status of a friend more than that of a parent. Permissive parenting often results in children who rank low in happiness and self-regulation. These children are more likely to experience problems with authority and tend to perform poorly in school.
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A pager
1. A pager is a simple personal telecommunications device for short messages. A one-way numeric pager can only receive a message consisting of a few digits, typically a phone number that the user is then requested to call. Alphanumeric pagers are available, as well as two-way pagers that have the ability to send and receive email, numeric pages, and SMS messages.
2. The first practical pager was introduced in 1950 by physicians in the New York City area. The first pager system had a range of approximately 40 km (25 mi) and the physicians paid 12 USD per month for the service. The actual pager device was developed and manufactured by Reevesound Company of New York and weighed approximately 200 grams (6 oz).
3. Pagers are still in use today in places where mobile phones typically cannot reach users, and also in places where the operation of the radio transmitters contained in mobile phones is problematic or prohibited. One such type of location is a large hospital complex, where cellular coverage is often weak or nonexistent, where radio transmitters are thought to interfere with sensitive medical equipment and where there is a greater need of assurance for a timely delivery of a message.
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US Constitution
1. The US Constitution was adopted in 1787 after the War of Independence. A constitution is a set of customs, traditions, rules and laws that sets forth the basic way a government is organized and functions. It is very important to understand that having a constitution does not mean that a nation has a constitutional government. If a constitution makes it possible to concentrate power by one or few, it is not the basis of a constitutional government. If a constitution says that the government’s power should be limited but doesn’t mention the ways how to do it, it is not the basis for a constitutional government.
2. In a constitutional government the constitution is a form higher law that must be obeyed by everyone including those in power.
The US Constitution consists of 7 articles and 26 amendments. According to the Founders of the American state a constitution or higher law should have the following characteristics:
it sets forth the basic rights of citizens to life, liberty, and property;
it establishes the responsibility of the government to protect those rights;
it establishes limitations on how those in government use their powers with regard to citizens’ rights and responsibilities, the distribution of resources, the control of conflict;
it establishes the principle of a private domain – which means that there are areas of citizens’ lives that are no business of the government and in which the government cannot interfere;
it can be changed with the consent of the most citizens. This is how the Constitution differs from the ordinary law that governments regularly create and enforce. The US Constitution has 26 amendments, the first 10 are called the Bill of Rights and it was adopted in 1791. The Bill enumerated basic freedoms and guaranteed them and declared what the government was not allowed to do.
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An electric capacitor
1. An electric capacitor is a passive two-terminal electrical component used to store energy in an electric field. The forms of practical electric capacitors vary widely, but all contain at least two electrical conductors separated by a dielectric; for example, one common construction consists of metal foils separated by a thin layer of insulating film. Electric capacitors are widely used as parts of electrical circuits in many common electrical devices.
2. When there is a potential difference across the conductors, a static electric field develops across the dielectric, causing positive charge to collect on one plate and negative charge on the other plate. Energy is stored in the electrostatic field. An ideal electric capacitor is characterized by a single constant value, capacitance, measured in farads. This is the ratio of the electric charge on each conductor to the potential difference between them.
3. The capacitance is greatest when there is a narrow separation between large areas of conductor, hence, the capacitor conductors are often called plates, referring to an early means of construction. In practice, the dielectric between the plates passes a small amount of leakage current and also has an electric field strength limit, resulting in a breakdown voltage, while the conductors and leads introduce an undesired inductance and resistance.
4. The capacitors are widely used in electronic circuits for blocking direct current while allowing alternating current to pass, in filter networks, for smoothing the output of power supplies, in the resonant circuits that tune radios to particular frequencies, in electric power transmission systems for stabilizing voltage and power flow, and for many other purposes.
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