2019年雅思阅读模拟试题：流程图题(1)

2019年雅思阅读模拟试题：流程图题(1) BAKELITE

The birth of modern plastics

In 1907, Leo Hendrick Baekeland, a Belgian scientist working in New York, discovered and patented a revolutionary new synthetic material. His invention, which he named

'Bakelite,’was of enormous technological importance, and effectively launched the modern plastics industry.

The term 'plastic' comes from the Greek plassein, meaning 'to mould'. Some plastics are derived from natural sources, some are semi-synthetic (the result of chemical action on a natural substance), and some are entirely synthetic, that is, chemically engineered from the constituents of coal or oil. Some are 'thermoplastic', which means that, like candlewax, they melt when heated and can then be reshaped. Others are 'thermosetting'： like eggs, they cannot revert to their original viscous state, and their shape is thus fixed for ever. Bakelite had the distinction of being the first totally synthetic thermosetting plastic.

The history of today's plastics begins with the discovery of a series of semi-synthetic thermoplastic materials in the mid-nineteenth century. The impetus behind the development of these early plastics was generated by a number of factors—immense technological progress in the domain of chemistry, coupled with wider cultural changes, and the pragmatic need to find acceptable substitutes for dwindling supplies of 'luxury' materials such as

tortoiseshell and ivory.

Baekeland's interest in plastics began in 1885 when, as

a young chemistry student inBelgium, he embarked on research into phenolic resins, the group of sticky substances produced when phenol (carbolic acid) combines with an aldehyde (a volatile fluid similar to alcohol). He soon abandoned the subject, however, only returning to it some years later. By 1905 he was a wealthy New Yorker, having recently made his fortune with the invention of a new photographic paper. While Baekeland had been busily amassing dollars, some advances had been made in the development of plastics. The years 1899 and 1900 had seen the patenting of the first semi-synthetic thermosetting material that could be manufactured on an industrial scale. In purely scientific terms, Baekeland's major contribution to the field is not so much the actual discovery of the material to which he gave his name, but

rather the method by which a reaction between phenol and formaldehyde could be controlled, thus making possible its preparation on a commercial basis. On 13 July 1907, Baekeland took out his famous patent describing this preparation, the essential features of which are still in use today.

The original patent outlined a three-stage process, in which phenol and formaldehyde (from wood or coal) were

initially combined under vacuum inside a large egg-shaped kettle. The result was a resin known as Novalak which became soluble and malleable when heated. The resin was allowed to cool in shallow trays until it hardened, and then broken up and ground into powder. Other substances were then introduced：including fillers, such as woodflour, asbestos or cotton, which increase strength and moisture resistance, catalysts substances to speed up the reaction between two chemicals

without joining to either) and hexa, a compound of ammonia

and formaldehyde which supplied the additional formaldehyde necessary to form a thermosetting resin. This resin was then left to cool and harden, and ground up a second time. The resulting granular powder was raw Bakelite, ready to be made into a vast range of manufactured objects. In the last stage, the heated Bakelite was poured into a hollow mould of the required shape and subjected to extreme heat and pressure, thereby 'setting' its form for life.

The design of Bakelite objects, everything from earrings to television sets, was governed to a large extent by the technical requirements of the molding process. The object

could not be designed so that it was locked into the mould

and therefore difficult to extract. A common general rule was that objects should taper towards the deepest part of the mould, and if necessary the product was molded in separate pieces. Moulds had to be carefully designed so that the

molten Bakelite would flow evenly and completely into the mould. Sharp corners proved impractical and were thus avoided, giving rise to the smooth, streamlined' style popular in the 1930s. The thickness of the walls of the mould was also crucial： thick walls took longer to cool and harden, .a

factor which had to be considered by the designer in order to make the most efficient use of machines.

Baekeland's invention, although treated with disdain in

its early years, went on to enjoy an unparalleled popularity which lasted throughout the first half of the twentieth century. It became the wonder product of the new world of industrials expansion—‘the material of a thousand uses’. Being both non-porous and heat-resistant, Bakelite kitchen

goods were promoted as being germ-free and sterilisable. Electrical manufacturers seized on its insulating properties, and consumers everywhere relished its dazzling array of shades, delighted that they were now, at last, no longer restricted to the wood tones and drab browns of the

preplastic era. It then fell from favour again during the 1950s, and was despise and destroyed in vast quantities. Recently, however, it has been experiencing something of a renaissance, with renewed demand for original Bakelite objects in the collectors' marketplace, and museums,

societies and dedicated individuals once again appreciating the style and originality of this innovative material.

雅思阅读TFNG模拟试题(4)

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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

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1. A European spacecraft took off today to spearhead the search for another "Earth" among the stars. 2. The Corot space telescope blasted off aboard a Russian Soyuz rocket from the Baikonur cosmodrome in Kazakhstan shortly after 2.20pm. 3. Corot， short for convection rotation and planetary transits， is the first instrument capable of finding small rocky planets beyond the solar system. Any such planet situated in the right orbit stands a good chance of having liquid water on its surface， and quite possibly life， although a leading scientist involved in the project said it was unlikely to find "any little green men". 4. Developed by the French space agency， CNES， and partnered by the European Space Agency (ESA)， Austria， Belgium， Germany， Brazil and Spain， Corot will monitor around 120，000 stars with its 27cm telescope from a polar orbit 514 miles above the Earth. Over two and a half years， it will focus on five to six different areas of the sky， measuring the brightness of about 10，000 stars every 512 seconds. 5. "At the present moment we are hoping to find out more about the nature of planets around stars which are potential habitats. We are looking at habitable planets， not inhabited planets. We are not going to find any little green men，" Professor Ian Roxburgh， an ESA scientist who has been involved with Corot since its inception， told the BBC Radio 4 Today programme. 6. Prof Roxburgh said it was hoped Corot would find "rocky planets that could develop an atmosphere and， if they are the right distance from their parent star，they could have water". 7. To search for planets， the telescope will look for the dimming of starlight caused when an object passes in front of a star， known as a "transit". Although it will take more sophisticated space telescopes planned in the next 10 years to confirm the presence of an Earth-like planet with oxygen and liquid water， Corot will let scientists know where to point their lenses.

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

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【点课台课堂】雅思阅读表格填空题讲解--Alternative Medicine in Australia 点课台独家，雅思阅读机经真题解析。一切患有雅思阅读刷题强迫症的烤鸭，请看这里。点课台精心整理了一批雅思阅读机经真题。如果你的剑桥雅思阅读已是烂熟于心，那么这一系列的雅思阅读机经真题真的很适合你，搭配上绝对原创的讲解，还有全文的中文翻译，这等阅读大餐，还等什么! Alternative Medicine in Australia The first students to study alternative medicine at university level in Australia began their four-year, full-time course at the University of Technology Sydney, in early 1994. Their course covered, among other therapies, acupuncture. The theory they learnt is based on the traditional Chinese explanation of this ancient healing art that it can regulate the flow of ‘Qi’or energy through pathways in the body. This course reflects how far some alternative therapies have come in their struggle for acceptance by the medical establishment. Australia has been unusual in the Western world in having a very conservative attitude to natural or alternative therapies, according to Dr Paul Laver, a lecturer in Public Health at the University of Sydney. ‘We’ve had a tradition of doctors being fairly powerful and I guess they are pretty loath to allow any pretenders to their position to come into it.’ In many other industrialized countries, orthodox and alternative medicine have worked ‘hand in glove’ for years. In Europe, only orthodox doctors can prescribe herbal medicine. In Germany, plant remedies account for 10% of the national turnover of

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雅思阅读图表题实例分析 雅思阅读图表题一般难度不大，但是想要轻松拿到满分却也不容易。希望下面的这篇雅思阅读图表题实例分析可以帮助大家更好地备考雅思阅读图表题。 一、图表题简介 图表题主要考察生快速寻读定位，并理解细节信息的阅读能力。一般来说，图表题常见的有三种形式： 统计表(Table)——文章中会有很明显的时间标志，主要以表格的形式出现;原理图(Diagram)——在文章的某段或者某几段之间，会有一个详细地对于该物体的结构的介绍;流程图(Flow Chart)——一个物体的制作过程或者一种动植物的生长周期过程，需要你填写其中的某几个过程。 二、图表题的做题方法 1. 注意题目要求 因为这类填空题中一般都会出现“…NO MORE THAN * WORDS…”, 大家要注意具体不超过几个字。 2. 浏览图表，找到关键词 大家一看到图表题，就会将目光自动聚焦到图表上，希望能尽快找到有用信息帮助定位。举个例子吧：

这是剑8 Test 4 Passage 3的最后一个题型。我们可以看到，除了空格之外，有用的信息就只有one method of collecting ants 和funnel。因为这是最后一道题，通过前面的做题过程我们可以迅速排除前两种采集蚂蚁的办法，然后根据funnel可以定位到第三种采集方法，也就是原文第四段： ……One of the most successful ways to collect them is to gather the leaf litter in which they are foraging and extract the ants from it. This is most commonly done by placing leaf litter on a screen over a large funnel, often under some heat. As the leaf litter dries from above, ants (and other animals) move downward and eventually fall out the bottom and are collected in alcohol placed below the funnel. This method works especially well in rain forests and marshy areas…… 3. 将原文和题目仔细比较，找到答案

雅思阅读模拟试题精选

雅思阅读模拟试题精选

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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