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1、2013年职称英语考试理工类A级真题及答案第1部分：词汇选项下面每个句子中均有1个词或者短语有括号，请为每处括号部分确定1个意义最为接近的选项。1、 The rules are too (rigid) to allow for human error. A. inflexible B. general C. complex D. direct2、 This species has nearly (died out) because its habitat is being destroyed. A. turned dead B. passed by C. carried away D. bec
2、ome extinct3、 The contract between the two companies will (expire) soon. A. shorten B. end C. start D. resume4、 Three world-class tennis players came to (contend) for this title. A. argue B. claim C. wish D. compete5、 The methods of communication used during the war were (primitive). A. simple B. re
3、liable C. effective D. alternative6、 Respect for life is a (cardinal) principle of the law. A. moral B. regular C. fundamental D. hard7、 The drinking water has became (contaminated) with lead. A. polluted B. treated C. tested D. corrupted8、 Come out, or Ill (bust) the door down. A. shut B. set C. br
4、eak D. beat9、 She (shed) a few tears at her daughters wedding. A. wiped B. injected C. produced D. removed10、 They didnt seem to appreciate the (magnitude) of the problem. A. existence B. importance C. cause D. situation11、 The tower remains (intact) ever after two hundred years. A. unknown B. unusu
5、al C. undamaged D. unstable12、 Many experts remain (skeptical) about his claims. A. doubtful B. untouched C. certain D. silent13、 The proposal was (endorsed) the majority of members. A. rejected B. submitted C. considered D. approved14、 Rumors began to (circulate) about his financial problems. A. se
6、nd B. spread C. hear D. confirm15、 The police will need to keep a (wary) eye on this area of town. A. naked B. cautious C. blind D. private第2部分：阅读判断下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断；如果该句提的是正确信息，请选择A；如果该句提的是错误信息，请选择B；如果该句的信息文中没有提及，请选择C。New Understanding of Natural Silks Mysteries Natural silk, as we al
7、l know, has a strength that manmade materials have long struggled to match. In a discovery that sounds more like an ancient Chinese proverb than a materials science breakthrough, MIT researchers have discovered that silk gets its strength from its weakness. Or, more specifically, its many weaknesses
8、. Silk gets its extraordinary durability and ductility from an unusual arrangement of hydrogen bonds that are inherently very weak but that work together to create a strong, flexible structure. Most materials-especially the ones we engineer for strength-get their toughness from brittleness. As such,
9、 natural silks like those produced by spiders have long fascinated both biologists and engineers because of their light weight, ductility and high strength (pound for pound, silk is stronger than steel and far less brittle). But on its face, it doesnt seem that silks should be as strong as they are;
10、 molecularly, they are held together by hydrogen bonds, which are far weaker than the covalent bonds found in other molecules. To get a better understanding of how silk manages to produce such strength through such weak bonds, the MIT team created a set of computer models that allowed them to observ
11、e the way silk behaves at the atomic level. They found that the arrangement of the tiny silk nanocrystals is such that the hydrogen bonds are able to work cooperatively, reinforcing one another against external, forces and failing slowly when they do fail, so as not so allow a sudden fracture to spr
12、ead across a silk structure. The result is that natural silks can stretch and bend while retaining a high degree of strength. But while thats all well and good for spiders, bees and the like, this understanding of silk geometry could lead to new materials that are stronger and more ductile than thos
13、e we can currently manufacture. Our best and strongest materials are generally expensive and difficult to produce (requiring high temperature treatments or energy-intensive processes). By looking to silk as a model, researchers could potentially devise new manufacturing methods that rely on inexpens
14、ive materials and weak bonds to create less rigid, more forgiving materials that are nonetheless stronger than anything currently on offer. And if you thought you were going to get out of this materials science story without hearing about carbon nanotubes, think again. The MIT team is already in the lab looking into ways of synthesizing silk-like structures out o
