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1、READING PASSAGE 1You should spend about 20 minutes on Questions 1-14 which are based on Reading Passage 1.10Spider silk cuts weight of bridgesA strong, light bio-material made by genes from spiders could transform construction and industry.A Scientists have succeeded in copying the silk-producing ge
2、ne of the Golden Orb Weaver spider and are using them to create a synthetic material which they believe is the model for a new generation of advanced bio-materials. The new material, biosilk, which has been spun for the first time by researchers at DuPont, has an enormous range of potential uses in
3、construction and manufacturing. B The attraction of the silk spun by the spider is a combination of great strength and enormous elasticity, which man-made fibres have been unable to replicate. On an equal-weight basis, spider silk is far stronger than steel and it is estimated that if a single stran
4、d could be made about 10m in diameter, it would be strong enough to stop a jumbo jet in flight. A third important factor is that it is extremely light. Army scientists are already looking at the possibilities of using it for lightweight, bullet-proof vests and parachutes.C For some time, biochemists
5、 have been trying to synthesise the drag-line silk of the Golden Orb Weaver. The drag-line silk, which forms the radial arms of the web, is stronger than the other parts of the web and some biochemists believe a synthetic version could prove to be as important a material as nylon, which has been aro
6、und for 50 years, since the discoveries of Wallace Carothers and his team ushered in the age of polymers.D To recreate the material, scientists, including Randolph Lewis at the University of Wyoming, first examined the silk-producing gland of the spider. We took out the glands that produce the silk
7、and looked at the coding for the protein material they make, which is spun into a web. We then went looking for clones with the right DNA, he says.E At DuPont, researchers have used both yeast and bacteria as hosts to grow the raw material, which they have spun into fibres. Robert Dorsch, DuPonts di
8、rector of biochemical development, says the globules of protein, comparable with marbles in an egg, are harvested and processed. We break open the bacteria, separate out the globules of protein and use them as the raw starting material. With yeast, the gene system can be designed so that the materia
9、l excretes the protein outside the yeast for better access, he says.F The bacteria and the yeast produce the same protein, equivalent to that which the spider uses in the drag lines of the web. The spider mixes the protein into a water-based solution and then spins it into a solid fibre in one go. S
10、ince we are not as clever as the spider and we are not using such sophisticated organisms, we substituted man-made approaches and dissolved the protein in chemical solvents, which are then spun to push the material through small holes to form the solid fibre.”G Researchers at DuPont say they envisag
11、e many possible uses for a new biosilk material. They say that earthquake-resistant suspension bridges hung from cables of synthetic spider silk fibres may become a reality. Stronger ropes, safer seat belts, shoe soles that do not wear out so quickly and tough new clothing are among the other applic
12、ations. Biochemists such as Lewis see the potential range of uses of biosilk as almost limitless. It is very strong and retains elasticity; there are no man-made materials that can mimic both these properties. It is also a biological material with all the advantages that has over petrochemicals, he
13、says.H At DuPonds laboratories, Dorsch is excited by the prospect of new super-strong materials but he warns they are many years away. We are at an early stage but theoretical predictions are that we will wind up with a very strong, tough material, with an ability to absorb shock, which is stronger
14、and tougher than the man-made materials that are conventionally available to us, he says.IThe spider is not the only creature that has aroused the interest of material scientists. They have also become envious of the natural adhesive secreted by the sea mussel. It produces a protein adhesive to atta
15、ch itself to rocks. It is tedious and expensive to extract the protein from the mussel, so researchers have already produced a synthetic gene for use in surrogate bacteria.Questions 1-5The passage has nine paragraphs A-I.Which paragraph contains the following information?Write the correct letter A-I
16、 in boxes 1-5 on your answer sheet.1a comparison of the ways two materials are used to replace silk-producing glands2 predictions regarding the availability of the synthetic silk3 on-going research into other synthetic materials4the research into the part of the spider that manufactures silk5 the possible application of the silk in civil engineeringQuestions 6- 11Complete
