搜档网
当前位置:搜档网 › 雅思阅读真题

雅思阅读真题

雅思阅读真题
雅思阅读真题

The Spectacular Eruption of Mount St. Helens

A The eruption in May 1980 of Mount St. Helens, Washington State, astounded the world with its violence. A gigantic explosion tore much of the volcano's summit to fragments; the energy released was equal to that of 500 of the nuclear bombs that destroyed Hiroshima in 1945.

B The event occurred along the boundary of two of the moving plates that make up the Earth's crust. They meet at the junction of the North American continent and the Pacific Ocean. One edge of the continental North American plate over-rides the oceanic Juan de Fuca micro-plate, producing the volcanic Cascade range that includes Mounts Baker, Rainier and Hood, and Lassen Peak as well as Mount St. Helens.

C Until Mount St. Helens began to stir, only Mount Baker and Lassen Peak had shown signs of life during the 20th century. According to geological evidence found by the United States Geological Survey, there had been two major eruptions of Mount St. Helens in the recent (geologically speaking)past: around 1900 B.C., and about A.D. 1500. Since the arrival of Europeans in the region, it had experienced a single period of spasmodic activity, between 1831 and 1857. Then, for more than a century, Mount St. Helens lay dormant.

D By 1979, the Geological Survey, alerted by signs of renewed activity, had been monitoring

the volcano for 18 months. It warned the local population against being deceived by the mountain's outward calm, and forecast that an eruption would take place before the end of the century. The inhabitants of the area did not have to wait that long. On March 27, 1980,a few clouds of smoke formed above the summit , and slight tremors were felt. On the 28th, larger and darker clouds,. consisting of gas and ashes,. emerged and climbed as high as 20,000 feet. In April a slight lull ensued, but the volcanologists remained pessimistic. The, in early May, the northern flank of the mountain bulged, and the summit rose by 500 feet.

E Steps were taken to evacuate the population. Most- campers, hikers, timbercuttersleft the slopes of the mountain. Eighty-four-year-old Harry Truman, a holiday lodge owner who had lived there for more than 50 years, refused to be evacuated, in spite of official and public, including an entire class of school children, wrote to him, begging him to leave. He never did.

F On May 18, at 8.32 in the morning, Mount St. Helens blew its top. literally. Suddenly, it was 1300 feet shorter than it had been before its growth had begun. Over half a cubic mile of rock had disintegrated . At the same moment, an earthquake with an intensity of 5 on the Richter scale was recorded. It triggered an avalanche of snow and ice. mixed with hot rock-the entire north face of the mountain had fallen away. A wave of scorching volcanic gas and rock fragments shot horizontally from the volcano's riven flank, at an inescapable 200 miles per hour. As the sliding ice and snow melted, it touched off devastating torrents of mud and debris, which destroyed all life in their path. Pulverised, which destroyed all life in their path. Pulverised rock climbed as a dust cloud into the atmosphere. Finally, viscous lava, accompanied by burning clouds of ash and gas, welled out of volcano's new crater, and from lesser vents and cracks in its flanks.

G Afterwards, scientists were able to analyse the sequence of events. First, magmamolten

rock-at temperatures above 2000o F. had surged into the volcano from the Earth's mantle. The build-up was accompanied by an accumulation of gas, which increased as the mass of magma grew. It was the pressure inside the mountain that made it swell. Next, the rise in gas pressure caused a violent decompression. Which ejected the shattered summit like a cork from a shaken soda bottle. With the summit gone, the molten rock within was released in a jet of gas and fragmented magma, and lava welled from the crater.

H The effects of the Mount St. Helens eruption were catastrophic. Almost all the trees of the surrounding forest, mainly Douglas firs. were flattened. and their branches and bark ripped off by the shock wave of the explosion. Ash and mud spread over nearly 200 square miles of country. All the towns and settlements in the area were smothered in an even coating of ash. V olcanic ash silted up the Columbia River 35 miles away, reducing the debris that accumulated at the foot of the volcano reached a depth. in places, of 200 feet.

I The eruption of Mount St. Helens was one of the most closely observed and analysed in history. Because geologists had been expecting the event, they were able to amass vast amounts of technical data when it happened. Study of atmospheric particles formed as a result of the explosion showed that droplets of sulphuric acid, acting as a screen between the Sun and the Earth's surface, caused a distinct drop in temperature. There is no doubt that the activity of Mount St. Helens and other volcanoes since 1980 has influenced our climate . Even so, it has been calculated that the quantity of dust ejected by Mount St. Helens - a quarter of a cubic mile- was negligible in comparison with that thrown out by earlier eruptions, such as that of Mount Katmai in Alaska in 1912 (three cubic miles). The volcano is still active. Lava domes have formed inside the new crater, and have periodically burst. The threat of Mount St Helens lives on.

.Questions 1 and 2

Answer questions 1 and 2 by writing the appropriate letter A-I inboxes 1 and 2 on your answer sheet.

Example Answer

Which paragraph compares the eruption to the energy A

released by nuclear bomb?

1. Which paragraph describes the evacuation of the mountain?

2. Which paragraph describes the moment of the explosion of Mount St. Helens?

Questions 3 and 4

3. What are the dates of the TWO major eruptions of Mount St. Helens before 1980?

Write TWO dates in box 3 on your answer sheet.

4 How do scientists know that the volcano exploded around the two dates above?

Using NO MORE THAN THREE WORDS , write your answer in box 4 on your answer

sheet

Questions 5-8

Complete the summary of events below leading up to the eruption of Mount St. Helens. Choose NO MORE THAN THREE WORDS from the passage for each answer.

W rite your answers in boxes 5-8 on your answer sheet.

In 1979 the Geological Survey warned ... (5) ... to expect a violent eruption before the end of the

century. The forecast was soon proved accurate. At the end of March there were tremors and clouds formed above the mountain. This was followed by a lull, but in early May the top of the mountain rose by ... (6)... . People were ...(7) ... from around the mountain. Finally, on May 18th at ...(8) ..., Mount St. Helens exploded.

Question 9 and 10

Complete the table below giving evidence for the power of the Mount St. Helens eruption.

Write your answers in boxes 9 and 10 on your answer sheet.

Item Equivalent to

Example

The energy released by the explosion of

Mount St. Helens

Answer

500 nuclear bombs

The area of land covered in mud or ash ...(9)...

The quantity of dust ejected ...(10)...

Question 11

Choose the appropriate letter A-D and write it in box 11 one your answer sheet.

11. According to the text the eruption of Mount St. Helens and other volcanoes has influenced our climate by ...

A increasing the amount of rainfall.

B heating the atmosphere.

C cooling the air temperature.

D causing atmospheric storms.

READING PASSAGE 2

Questions 12-16

Reading Passage 2 has seven paragraphs A-G.

Choose the most suitable headings for paragraphs B-E and G from the list of heading below. Write the appropriate numbers (i-x) in boxes 12-16 on your answer sheet.

NB There are more headings than paragraphs so you will not use all of them.

You may use any of the headings more than once.

List of Headings

(i) The effect of changing demographics on organisations

(ii) Future changes in the European workforce

(iii) The unstructured interview and its validity

(iv) The person-skills match approach to selection

(v) The implications of a poor person-environment fit

(vi) Some poor selection decisions

(vii) The validity of selection procedures

(viii) The person-environment fit

(ix) Past and future demographic changes in Europe

(x) Adequate and inadequate explanations of organisational failure

Example Paragraph A Answer (x)

12. Paragraph B

13. Paragraph C

14. Paragraph D

15. Paragraph E

16. Paragraph G

PEOPLE AND ORGANISATIONS: THE SELECTION ISSUE

A In 1991, according to the Department of Trade and Industry, a record 48,000 British companies went out of business. When businesses fail, the post-mortem analysis is traditionally undertaken by accountants and market strategists. Unarguably organisations do fail because of undercapitalisation, poor financial management, adverse market conditions etc. Yet, conversely, organisations with sound financial backing, good product ideas and market acumen often underperform and fail to meet shareholders' expectations. The complexity, degree and sustainment of organisational performance requires an explanation which goes beyond the balance sheet and the "paper conversion" of financial inputs into profit making outputs. A more complete explanation of "what went wrong" necessarily must consider the essence of what an organisation actually is and that one of the financial inputs, the most important and often the most expensive, is people.

B An organisation is only as good as the people it employs. Selecting the right person for the

job involves more than identifying the essential or desirable range of skills, educational and professional qualifications necessary to perform the job and then recruiting the candidate who is most likely to possess these skills or at least is perceived to have the ability and predisposition to acquire them. This is a purely person/skills match approach to selection.

C Work invariably takes place in the presence and/or under the direction of others, in a particular organisational setting. The individual has to "fit" in with the work environment, with other employees, with the organisational climate, style or work, organisation and culture of the organisation. Different organisations have different cultures (Cartwright & Cooper, 1991; 1992). Working as an engineer at British Aerospace will not necessarily be a similar experience to working in the same capacity at GEC or Plessey.

D Poor selection decisions are expensive. For example, the costs of training a policeman are about £ 20,000 (approx. US$ 30,000). The costs of employing an unsuitable technician on an oil rig or in a nuclear plant could, in an emergency, result in millions of pounds of damage or loss of life. The disharmony of a poor person-environment fit (PE-fit) is likely to result in low job satisfaction, lack of organisational commitment and employee stress, which affect organisational outcomes i.e. productivity, high labour turnover and absenteeism, and individual outcomes i.e. physical, psychological and mental well-being.

E However, despite the importance of the recruitment decision and the range of sophisticated and more objective selection techniques available, including the use of psychometric tests, assessment centres etc., many organisations are still prepared to make this decision on the basis of a single 30 to 45 minute unstructured interview. Indeed, research has demonstrated that a selection decision is often made within the first four minutes of the interview. In the remaining time, the interviewer then attends exclusively to information that reinforces the initial "accept" or "reject"

decision. Research into the validity of selection methods has consistently demonstrated that the unstructured interview, where the interviewer asks any questions he or she likes, is a poor predictor of future job performance and fares little better that more controversial methods like graphology and astrology. In times of high unemployment,! recruitment becomes a "buyer's market" and this was the case in Britain during the 1980s.

F The future, we are told, is likely to be different. Detailed surveys of social and economic trends in the European community show that Europe's population is falling and getting older, The birth rate in the Community is now only three-quarters of the level needed to ensure replacement of the existing population. By the year 2020, it is predicted that more than one in four Europeans will be aged 60 or more and barely one in five will be under 20. In a five-year period between 1983 and 1988 the Community's female workforce grew by almost six million. As a result, 51% of all women aged 14 to 64 are now economically active in the labour market compared with 78% of men.

G The changing demographics will not only affect selection ratios. They will also make it increasingly important for organisations wishing to mainta in their competitive edge to be more responsive and accommodating to the changing needs of their workforce if they are to retain and develop their human resources. More flexible working hours, the opportunity of work from home or job share, the provision of childcare facilities etc., will play a major role in attracting and retaining staff in the future.

Questions 17-22

Do the following statements agree with the views of the writer in Reading Passage 2?

In boxes 17-22 on your answer sheet write

YES if the statement agrees with the writer

NO if the statement does not agree with the writer

NOT GIVEN if there is no information about this in the passage

17. Organisations should recognise that their employees are a significant part of their

financial assets.

18. Open-structured 45 minute interviews are the best method to identify suitable employees.

19. The rise in the female workforce in the European Community is a positive trend.

20. Graphology is a good predictor of future fob performance.

21. In the future, the number of people in employable age groups will decline.

22. In 2020, the percentage of the population under 20 will be smaller than now.

Questions 23-25

Complete the notes below with words taken from Reading Passage 2. Use NO MORE THAN ONE or TWO WORDS for each answer.

Write your answers in boxes 23-25 on your answer sheet.

READING PASSAGE 3

You should spend about 20 minutes on Questions 26-38 which are based on Reading Passage 3 on pages 9 and 10.

"The Rollfilm Revolution"

The introduction of the dry plate process brought with it many advantages. Not only was it much more convenient, so that the photographer no longer needed to prepare his material in advance, but its much greater sensitivity made possible a new generation of cameras. Instantaneous exposures had been possible before, but only with some difficulty and with special equipment and conditions. Now, exposures short enough to permit the camera to the held in the hand were easily achieved. As well as fitting shutters and viewfinders to their conventional stand cameras, manufacturers began to construct smaller cameras in tended specifically for hand use.

One of the first designs to be published was Thomas Bolas' s 'Detective' camera of 1881. Externally a plain box, quite unlike the folding bellows camera typical of the period, it could be used unobtrusively. The name caught on, and for the next decade or so almost all hand cameral were called ' Detectives', Many. of the new designs in the 1880s were for magazine cameras, in which a number of dry plates could be pre-loaded and changed one after another following exposure. Although much more convenient than stand cameras, still used by most serious workers, magazine plate cameras were heavy, and required access to a darkroom for loading and processing the plates. This was all changed by a young American bank clerk turned photographic manufacturer, George Eastman, from Rochester, New York.

Eastman had begun to manufacture gelatine dry plates in 1880. being one of the first to do so in America. He soon looked for ways of simplifying photography, believing that many people were put off by the complication and messiness. His first step was to develop, wih the camera manufacturer William H. Walker, a holder for a long roll of paper negative 'film'. This could be

fitted to a standard plate camera and up to forty-eight exposures made before reloading. The

combined weight of the paper roll and the holder was far less than the same number of glass plates in their ling-tight wooden holders. Although roll-holders had been made as early as the 1850s, none had been very successful be cause of the limitations of the photographic materials then available. Eastman's rollable paper film was sensitive and gave negatives of good quality; the Eastman-Walker roll-holder was a great success.

The next step was to combine the roll-holder with a small hand camera; Eastman's first design was patented with an employee, F. M. Cossitt, in 1886. It was not a success. Only fifty Eastman detective cameras were made, and they were sold as a lot to a dealer in 1887; the cost was too high and the design too complicated. Eastman set about developing a new model, which was launched in June 1888. It was a small box, containing a roll of paperbased stripping film sufficient for 100 circular exposures 6 cm in diameter. Its operation was simple: set the shutter by pulling a wire string; aim the camera using the V line impression in the camera top; press the release botton to activate the exposure; and turn a special key to wind to the film. A hundred exposures had to be made, so it was important to record each picture in the memorandum book provided, since there was no exposure counter. Eastman gave his camera the invented name

'Kodak'-which was easily pronounceable in most languages. and had two Ks which Eastman felt was a firm, uncompromising kind of letter.

The importance of Eastman's new roll-film camera was not that it was the first. There had been several earlier cameras, notably the Stirn 'America', first demonstrated in the spring of 1887 and on sale from early 1888. This also used a roll of negative paper, and had such refinements as a reflecting viewfinder and an ingenious exposure marker. The real significance of the first Kodak camera was that it was backed up by a developing and printing service. Hitherto ,virtually all photographers developed and printed their own pictures. This required that facilities of a darkroom and the time and inclination to handle the necessary chemicals, make the prints and so on. Eastman recognized that not everyone had the resources or the desire to do this. When a customer had made a hundred exposures in the Kodak camera, he sent it to Eastman's factory in Rochester (or later in Harrow in England) where the film was unloaded, processed and printed, the camera reloaded and returned to the owner. "You Press the Button, We Do the Rest" ran Eastman's classic marketing slogan; photography had been brought to everyone. Everyone, that is, who could afford $ 25 or five guineas for the camera and $ 10 or two guineas for the developing and printing . A guinea ( $ 5 ) was a week's wages for many at the time, so this simple camera cost the equivalent of hundreds of dollars today.

In 1889 an improved model with a new shutter design was introduced, and it was called the No. 2 Kodak camera. The paper-based stripping film was complicated to manipulate, since the processed negative image had to be stripped from the paper base for printing. At the end of 1889 Eastman launched a new roll film on a celluloid base. Clear, tough, transparent and flexible, the new film not only made the rollfilm camera fully practical, but provided the raw material for the introduction of cinematography a few years later. Other, larger models were introduced, including several folding versions, one of which took pictures 21.6 cm x 16.5 cm in size. Other manufacturers in America and Europe introduced cameras to take the Kodak roll-films, and other firms began to offer developing and printing services for the benefit of the new breed of Photographers.

By September 1889 , over 5,000 Kodak cameras had been sold in the USA, and the company was daily printing 6-7,000 negatives, Holidays and special events created enormous surges in demand

for processing: 900 Kodak users returned their cameras for processing and reloading in the week after the New York centennial celebration.

Questions 26-29

Do the following statements agree with the views of the writer in Reading Passage 3?

In boxes 26-29 on your answer sheet write

YES if the statement agrees with the writer

NO if the statement does agree with the writer

NOTGIVEN if there is no information about this in the passage

26. Before the dry plate process short exposures could only b achieved with cameras held in

the hand.

27. Stirn's America' camera lacked Kodak's developing service.

28. The first Kodak film cost the equivalent of a week's wages to develop.

29. Some of Eastman's 1891 range of cameras could be loaded in daylight.

Questions 30-34

Complete the diagram below. Choose NO MORE THAN THREE WORDS from the passage for each answer.

Write your answers in boxes 30-34 on your answer sheet.

Questions 35-38

Complete the table below. Choose NO MORE THAN THREE WORDS from the passage for each answer.

Write your answers in boxes 35-38 on your answer sheet.

2019年雅思考试巩固模拟试题及答案

2019年雅思考试巩固模拟试题及答案1 Next Year Marks the EU's 50th Anniversary of the Treaty A. After a period of introversion and stunned self-disbelief, continental European governments will recover their enthusiasm for pan-European institution-building in 2007. Whether the European public will welcome a return to what voters in two countries had rejected so short a time before is another matter. B. There are several reasons for Europe’s recovering self-confidence. For years European economies had been lagging dismally behind America (to say nothing of Asia), but in 2006 the large continental economies had one of their best years for a decade, briefly outstripping America in terms of growth. Since politics often reacts to economic change with a lag, 2006’s improv ement in economic growth will have its impact in 2007, though the recovery may be ebbing by then. C. The coming year also marks a particular point in a political cycle so regular that it almost seems to amount to a natural law. Every four or five years, European countries take a large stride towards further integration by signing a new treaty: the Maastricht treaty in 1992, the Treaty of Amsterdam in 1997, the Treaty of Nice in 2001. And in 2005 they were supposed to ratify a European constitution, laying the ground for yet more integration—until the calm rhythm

雅思阅读预测真题库4参考答案

Animal’s Self-Medicatin TRUE/NOT GIVEN/FALSE/TRUE pitch/terpenses/alkaloids/detoxity/hooks G/D/E/C Development of Public Management Theory BE/AD/AB/AC/A/B/D/C/B ---------------------------------------------17 Koalas C/C/A/B/A YES/NO/NO/NOT GIVEN/YES/NOT GIVEN/YES A Coastal Archaeology of Britain C/D/A TRUE/FALSE/TRUE/FALSE/NOT GIVEN/TRUE/TRUE/ADF

Communication Styles and Conflict iii/vii/i/iv/ix/viii/v/ii TRUE/FALSE/NOT GIVEN/TRUE/TRUE B Talc Powder Applied on Food and Agricultural Industries B/B/A/A/C/B 20/foam/waste water/harmful/biodegrade/droplet(s)/lamination(packing)/gr ape grower(s) Human Navigation-finding our way B / C / A / C / B / C / D / A / TRUE / NOT GIVEN / TRUE / FALSE / NOT GIVEN Plant Scents B/A/F/C TRUE/NOT GIVEN/TRUE/FALSE B/B/C/D/A

雅思阅读真题

Climate and Country Wealth Why are some countries stupendously rich and others horrendously poor? Social theorists have been captivated by this question since the late 18th century, when Scottish economist Adam Smith argued in his magisterial work The Wealth of Nations that the best prescription for prosperity is a free-market economy in which the government allows businesses substantial freedom to pursue profits. Smith, however, made a second notable hypothesis: that the physical geography of a region can influence its economic performance. He contended that the economies of coastal regions, with their easy access to sea trade, usually outperform the economies of inland areas. Coastal regions and those near navigable waterways are indeed far richer and more densely settled than interior regions, just as Smith predicted. Moreover, an area's climate can also affect its economic development. Nations in tropical climate zones generally face higher rates of infectious disease and lower agricultural productivity (especially for staple foods) than do nations in temperate zones. Similar burdens apply to the desert zones. The very poorest regions in the world are those saddled with both handicaps: distance from sea trade and a tropical or desert ecology. The basic lessons of geography are worth repeating, because most economists have ignored them. In the past decade the vast majority of papers on economic development have neglected even the most obvious geographical realities. The best single indicator of prosperity is gross national product (GNP) per capita – the total value of a country's economic output, divided by its population. A map showing the world distribution of GNP per capita immediately reveals the vast gap between rich and poor nations. The great majority of the poorest countries lie in the geographical tropics. In contrast, most of the richest countries lie in the temperate zones. Among the 28 economies categorized as high income by the World Bank, only Hong Kong, Singapore and part of T aiwan are in the tropical zone, representing a mere 2 percent of the combined population of the high-income regions. Almost all the temperate-zone countries have either high-income economies (as in the cases of North America, western Europe, Korea and Japan) or middle-income economies (as in the cases of eastern Europe, the former Soviet Union and China). In addition, there is a strong temperate-tropical divide within countries that straddle both types of climates. Most of Brazil, for example, lies within the tropical zone, but the richest part of the nation – the southernmost states –is in the temperate zone. There are two major ways in which a region’s climate affects economic development. First, it affects the prevalence of disease. Many kinds of infectious diseases are endemic to the tropical and subtropical zones. This tends to be true of diseases in which the pathogen spends part of its life cycle outside the human host: for instance, malaria (carried by mosquitoes) and helminthic infections (caused by parasitic worms). Although epidemics of malaria have occurred sporadically as far north as Boston in the past century, the disease has never gained a lasting foothold in the temperate zones, because the cold winters naturally control the mosquito-based

雅思阅读模拟试题及答案解析(2)

雅思阅读模拟试题及答案解析(2)

Next Year Marks the EU's 50th Anniversary of the Treaty A. After a period of introversion and stunned self-disbelief,continental European governments will recover their enthusiasm for pan-European institution-building in . Whether the European public will welcome a return to what voters in two countries had rejected so short a time before is another matter. B. There are several reasons for Europe’s recovering self-confidence. For years European economies had been lagging dismally behind America (to say nothing of Asia), but in the large continental economies had one of their best years for a decade, briefly outstripping America in terms of growth. Since politics often reacts to economic change with a lag,’s improvement in economic growth will have its impact in , though the recovery may be ebbing by then. C. The coming year also marks a particular point in a political cycle so regular that it almost seems to amount to a natural law. Every four or five years, European countries take a large stride towards further integration by signing a new treaty: the Maastricht treaty in 1992, the Treaty of Amsterdam in 1997, the Treaty of Nice in . And in they were supposed to ratify a European constitution, laying the ground for yet more integration—until the calm rhythm was rudely shattered by French and Dutch voters. But the political impetus to sign something every four or five years has only been interrupted,not immobilised, by this setback. D. In the European Union marks the 50th anniversary of another treaty—the Treaty of Rome, its founding charter. Government leaders have already agreed to celebrate it ceremoniously, restating their commitment to “ever closer union” and the basic ideals of European unity. By itself, and in normal circumstances, the EU’s 50th-birthday greeting to itself would be fairly meaningless, a routine expression of European good fellowship. But it does not take a Machiavelli to spot that once governments have signed the declaration (and it seems unlikely anyone would be so uncollegiate as to veto

2015年雅思阅读模拟试题及答案解析三

Time to cool it 1 REFRIGERATORS are the epitome of clunky technology: solid, reliable and just a little bit dull. They have not changed much over the past century, but then they have not needed to. They are based on a robust and effective idea--draw heat from the thing you want to cool by evaporating a liquid next to it, and then dump that heat by pumping the vapour elsewhere and condensing it. This method of pumping heat from one place to another served mankind well when refrigerators' main jobs were preserving food and, as air conditioners, cooling buildings. Today's high-tech world, however, demands high-tech refrigeration. Heat pumps are no longer up to the job. The search is on for something to replace them. 2 One set of candidates are known as paraelectric materials. These act like batteries when they undergo a temperature change: attach electrodes to them and they generate a current. This effect is used in infra-red cameras. An array of tiny pieces of paraelectric material can sense the heat radiated by, for example, a person, and the pattern of the array's electrical outputs can then be used to construct an image. But until recently no one had bothered much with the inverse of this process. That inverse exists, however. Apply an appropriate current to a paraelectric material and it will cool down. 3 Someone who is looking at this inverse effect is Alex Mischenko, of Cambridge University. Using commercially available paraelectric film, he and his colleagues have generated temperature drops five times bigger than any previously recorded. That may be enough to change the phenomenon from a laboratory curiosity to something with commercial applications. 4 As to what those applications might be, Dr Mischenko is still a little hazy. He has, nevertheless, set up a company to pursue them. He foresees putting his discovery to use in more efficient domestic fridges and air conditioners. The real money, though, may be in cooling computers. 5 Gadgets containing microprocessors have been getting hotter for a long time. One consequence of Moore's Law, which describes the doubling of the number of transistors on a chip every 18 months, is that the amount of heat produced doubles as well. In fact, it more than doubles, because besides increasing in number,the components are getting faster. Heat is released every time a logical operation is performed inside a microprocessor, so the faster the processor is, the more heat it generates. Doubling the frequency quadruples the heat output. And the frequency has doubled a lot. The first Pentium chips sold by Dr Moore's company,Intel, in 1993, ran at 60m cycles a second. The Pentium 4--the last "single-core" desktop processor--clocked up 3.2 billion cycles a second. 6 Disposing of this heat is a big obstruction to further miniaturisation and higher speeds. The innards of a desktop computer commonly hit 80℃. At 85℃, they

2019年雅思考试阅读理解模拟练习试题及答案

2019年雅思考试阅读理解模拟练习试题及答案A. When Denis Hennequin took over as the European boss of McDonald’s in January 2004,the world’s biggest restaurant chain was showing signs of recovery in America and Australia,but sales in Europe were sluggish or declining.One exception was France,where Mr Hennequin had done a sterling job as head of the group’s French subsidiary to sell more Big Macs to his compatriots.His task was to replicate this success in all 41 of the European countries where anti- globalisers’favourite enemy operates. B. So far Mr Hennequin is doing https://www.sodocs.net/doc/ca2739749.html,st year European sales increased by 5.8%and the number of customers by 3.4%, the best annual results in nearly 15 years.Europe accounted for 36%of the group’s profits and for 28%of its sales.December was an especially good month as customers took to seasonal menu offerings in France and Britain,and to a promotion in Germany based on the game of Monopoly. C Mr Hennequin’s recipe for revival is to be more open about his company’s operations,to be“locally relevant”,and to improve the experience of visiting his 6,400 restaurants.McDonald’s is blamed for making people fat,exploiting workers,treating animals cruelly,polluting the environment and simply for being American.Mr Hennequin says

2019雅思阅读考试真题(19)

2019年雅思IELTS考试备考资料模拟试题及答案14 The nervous system of vertebrates is characterized by a hollow, dorsal nerve cord that ends in the head region as an enlargement, the brain. Even in its most primitive form this cord and its attached nerves are the result of evolutionary specialization, and their further evolution from lower to higher vertebrate classes is a process that is far from fully understood. Nevertheless, the basic arrangements are similar in all vertebrates, and the study of lower animals gives insight into the form and structure of the nervous system of higher animals. Moreover, for any species, the study of the embryological development of the nervous system is indispensable for an understanding of adult morphology. In any vertebrate two chief parts of the nervous system may be distinguished. These are the central nervous system (the nerve cord mentions above), consisting of the brain and spinal cord, and the peripheral nervous system, consisting of the cranial, spinal, and peripheral nerves, together with their motor and sensory endings. The term "autonomic nervous system" refers to the parts of the central and peripheral systems that supply and regulate the activity of cardiac muscle, smooth muscle, and many glands. The nervous system is composed of many millions of nerve and glial cells, together with blood vessels and a small amount of connective tissue. The nerve cells, or "neurons", are characterized by many processes and are specialized in that they exhibit to a great degree the phenomena of irritability and conductivity. The glial cells of the central nervous system are supporting cells collectively termed

雅思阅读试卷 附完整参考答案

Section I Words A.Match the words with the same meaning.W rite down the letters on you answer sheet. (1(1’’*6) 1.epidermic 2.motivate 3.assume 4.appealing 5.controversy 6expertise A.skill or knowledge in a particular area B.dispute,argument C.attractive D.an outbreak of a contagious disease that spreads rapidly and widely E.to provide with an incentive;impel . F.to take for granted,suppose B.Fill in the blanks with proper forms of words given in the box,one word can be used more than once.(1(1’’*10) evolve prepare propose minimum peer through cheat weep address exploit except 1.Not surprisingly,his was not well received,even though it seemed to agree with the scientific information available at the time.. 2.The little girl with disappointment when she learned that her favourite Barbie Dolls were sold out. 3.The price is her,she refuses to lower it any further. 4.Apes,monkeys and many other primates have fairly elaborate systems of calls for communicating with other members of their species. 5.Some melodies are quite manipulative,working on our emotions very effectively,and composers have often this to the full. 6.I realized I’d been when I saw the painting on sale for half the price I paid for it. 7.To this problem,Counter Intelligence built a kitchen of its own and started making gagets to fill it with. 8.Most birds don’t have a good sense of smell,but fish-eaters such as petrels and shearwaters are significant. 9.Why bother a clear door,when you can put a camera in the oven to broadcast snapshots of the activities in the oven to a screen in another room? 10.Exploration will allow us to make suitable for dealing with any dangers that we might face,and we may be able to find physical resources such as minerals. SectionⅡ.Translation A.Translate the following sentences into English.(3(3’’*5) 1.Despite the hardship he encountered,Mark never (放弃对知识的追求) 2.由于缺乏对这种病的了解,许多人依然认为HIV受害者都是自作自受。(owing to; ignorance)

2020年11月21日雅思考试真题及答案

2020年11月21日雅思考试真题及答案 雅思线下11月21日已结束,雅思又上热搜,很多小伙伴看到阅读的书剑,内心都一惊。11月难度再次刷新,不知道12月的会不会简单点……那么2020年11月21日雅思考试试题如何呢?我们一起回顾下: 2020年11月21日雅思听力真题及答案SECTION 1 主题:旅游咨询 题型:填空 参考答案: 1. 13 July 2. Temple 3. ferry 4. moderate 5. dancing 6. castle 7. breakfast 8. house 9. Harvey 10. 45 days SECTION 2

主题:交响音乐会介绍 题型:选择+匹配 参考答案: 11. new people 12. who can play violin 13. attend two rehearsals every week 14. play in local area 15. E 16. F 17. A 18. G 19. B 20. H SECTION 3 主题:关于学习的调研网课讨论 题型:选择+匹配 SECTION 4 主题:气候与建筑 题型:填空 参考答案: 31. both in rural areas and in cities 32. received funds of a city bank

33. skyscrapers: lower levels of acid in damaging pollutants 34. in recent years, Alter Project focuses on the buildings made of stone 35. glasses used to reduce pollution in skyscrapers 36. are affected by the increased rainfall 37. humidity affects the constrictions made of wood 38. are worried about the soil that protects the foundation of buildings 39. architects monitor the evidence of the movement of buildings 40. government should make guidelines for architects 2020年11月21日雅思阅读真题及答案Passage 1 主题:新旧公园 题型:匹配+选择 参考答案: 1. A:visibility and accessibility of parks 2. B:park numbers increased 3. C:reasons why park popularity declined 4. D:importance of park design 5. E:different opinions in the park roles 6. F:different functions of parks 7. David 8. James

雅思阅读模拟试题及答案解析(4)

雅思阅读模拟试题及答案解析(4)

Selling Digital Music without Copy-protection Makes Sense A. It was uncharacteristically low-key for the industry’s greatest showman. But the essay published this week by Steve Jobs, the boss of Apple,on his firm’s website under the unassuming title “Thoughts on Music” has nonetheless provoked a vigorous debate about the future of digital music,which Apple dominates with its iPod music-player and iTunes music-store. At issue is “digital rights management” (DRM)—the technology guarding downloaded music against theft. Since there is no common standard for DRM, it also has the side-effect that songs purchased for one type of music-player may not work on another. Apple’s DRM system, called FairPlay, is the most widespread. So it came as a surprise when Mr. Jobs called for DRM for digital music to be abolished. B. This is a change of tack for Apple. It has come under fire from European regulators who claim that its refusal to license FairPlay to other firms has “locked in” customers. Since music from the iTunes store cannot be played on non-iPod music-players (at least not without a lot of fiddling), any iTunes buyer will be deterred from switching to a device made by a rival firm, such as Sony or Microsoft. When French lawmakers drafted a bill last year compelling Apple to open up FairPlay to rivals, the company warned of “state-sponsored piracy”. Only DRM, it implied, could keep the pirates at bay. C. This week Mr. Jobs gave another explanation for his former defence of DRM: the record companies made him do it. They would make their music available to the iTunes store only if Apple agreed to protect it using DRM. They can still withdraw their catalogues if the DRM system is compromised. Apple cannot license FairPlay to others, says Mr Jobs, because it would depend on them to produce security fixes promptly. All DRM does is restrict consumer choice and provide a barrier to entry, says Mr Jobs; without it there would be far more stores and players, and far more innovation. So, he suggests, why not do away with DRM and sell music unprotected?“This is

相关主题