2021年12月大学英语四级阅读理解赏析campione
1.2021年12月大学英语四级阅读理解赏析
The stone age, The Iron Age. Entire epochs have been named for materials. So what to call the decades ahead? The choice will be tough. Welcome to the age of superstuff. Material science -- once the least xy technology – is bursting with new, practical discoveries led by superconducting ceramicsthat may revolutionize electronics. But superconductors are just part of the picture: from hou and cars to cook pots and artificial teeth, the world will someday be made of different stuff. Exotic plastics, glass and ceramics willshape the future just as surely as have genetic engineering and computer science.
The key to the new materials is rearchers’ increasing ability to manipulate substances at the molecular level. Ceramics, for example, have long been limited by their brittleness. But by minimizing the microscopic imperfections that cau it, scientists are making far stronger ceramics that still retain such qualities as hardness and heat resistance. Ford Motor Co. no
w us ceramic tools to cut steel. A firm called Kyocera has created a line of ceramic scissors and knives that stay sharp for years and never rust or corrode.
A similar transformation has overtaken plastics. High-strength polymers now form bridges, ice-skating rinks and helicopter rotors. And one new plastic that generates electricity when vibrated or pushed is ud in electric guitars, touch nsors for robot hands and karate jacketsthat automatically record each punch and chop. Even plastic litter, which once threatened to permanently blot the landscape, has proved amenable to molecular tinkering. Several manufacturers now make biodegradable forms; some plastic six-pack rings for example, gradually decompo when expod to sunlight. Rearchers are developing ways to make plastics as recyclable as metal or glass. Besides, composites – plastic reinforced with fibers of graphite or other compounds – made the round-the-world flight of the voyager possible and have even been proved in combat: a helmet saved an infantryman’s life by deflecting two bullets in the Grenada invasion.lonely
Some advanced materials are old standard with a new twist. The newest fiberoptic cabl
e that carry telephone calls cross-country are made of glass so transparent that a piece of 100 miles thick is clearer than a standard window pane.
高中英语新课程标准 But new materials have no impact until they are made into products. And that transition could prove difficult, for switching requires lengthy rearch and investment. It can be said a firmer handle on how to move to commercialization will determine the success or failure of a country in the near future.
1. How many new materials are mentioned in this passage?
[A] Two
[B] Three
[C] Four
[D] Five
2. Why does the author mention genetic engineering and computer science?
[A] To compare them with the new materials.
[B] To show the significance of the new materials on the future world.
[C] To compare the new materials to them.
[D] To explain his view point.
3. Why is transition difficult?
[A] Becau transition requires money and time.
[B] Becau many manufacturers are unwilling to change their equipment.
[C] Becau rearch on new materials is very difficult.
[D]Becau it takes 10 years.mortal
4. Where lies success of a country in the New Age of superstuff?
[A] It lies in rearch.
[B] It lies in investment.
s suggest>美眉制造机 [C] It lies in innovation.
[D] It lies in application.
2.2021年12月大学英语四级阅读理解赏析
From the health point of view we are living in a marvelous age. We are immunized from birth against many of the most dangerous dias. A large number of once fatal illness can now be cured by modern drugs and surgery. It is almost certain that one day remedies will be found for the most stubborn remaining dias. The expectation of life has incread enormously. But though the possibility of living a long and happy life is greater than ever before, every day we witness the incredible slaughter of men, women and children on the roads. Man versus the motor-car! It is a never-ending battle which man is losing. Thousands of people the world over are killed or horribly killed each year and we are quietly sitting back and letting it happen.
生活大爆炸第十季下载 It has been rightly said that when a man is sitting behind a steering wheel, his car becomes the extension of his personality. There is no doubt that the motor-car often brings out a man's very worst qualities. People who are normally quiet and pleasant may become unrecognizable when they are behind a steering-wheel. They swear, they are ill-mannered and aggressive, willful as two-years-olds and utterly lfish. All their hidden frustrations, disappointments and jealousies em to be brought to the surface by the act of driving.工程造价就业前景>at all
The surprising thing is that society smiles so benignly on the motorist and ems to condonehis behaviour. Everything is done for his convenience. Cities are allowed to become almost uninhabitable becau of heavy tragic; towns are made ugly by huge car parks; the countryside is decrated by road networks; and the mass annual slaughter becomes nothing more than a statistic, to be conveniently forgotten.
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