[考研类试卷]考研英语(阅读)模拟试卷125及答案与解析.doc
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1、考研英语(阅读)模拟试卷 125 及答案与解析Part ADirections: Read the following four texts. Answer the questions below each text by choosing A, B, C or D. (40 points)0 Commuter trains are often stuffy and crowded, and they frequently fail to run on time. As if that were not bad enough, Tsuyoshi Hondou, a physicist at T
2、ohoku University in Japan, published a paper in 2002 that gave commuters yet another reason to feel uncomfortable. Dr. Hondou examined mobile-phone usage in enclosed spaces such as railway carriages, buses and lifts, all of which are, in essence, metal boxes. His model predicted that a large number
3、of passengers crowded together, all blathering, sending text messages, or browsing the web on their phones, could produce levels of electromagnetic radiation that exceed international safety standards. That is because the radio waves produced by each phone are reflected off the metal walls of the ca
4、rriage, bus or lift. Enough radiation escapes to allow the phone to communicate with the network, but the rest bathes the inside of the carriage with bouncing microwaves.This sounds worrying. But maybe it isnt after all. In a paper published recently in Applied Physics Letters, Jaime Ferrer and Luca
5、s Fernandez-Seivane from the University of Oviedo in Spainalong with colleagues from the Polytechnic University of Madrid and Telefonica Moviles, a Spanish mobile operatordispute Dr. Hondous findings. They conclude that the level of radiation is safe after all.The key addition to the new research is
6、 the effect of the passengers themselves. While each phone produces radiation that bounces around the car, the passengers absorb some of it, which has the effect of reducing the overall intensity, just as the presence of an audience changes the acoustics of a concert hall, making it less reverberant
7、. Dr. Hondous model, in short, was valid only in the case of a single passenger sitting in an empty carriage with an active mobile phone on every seat.While Dr. Hondou acknowledged this in his original paper, he did not specifically calculate the effect that leaving out the other passengers would ha
8、ve on the radiation level. As a result, say the authors of the new paper, he significantly overestimated the level of electromagnetic radiation. When one is sitting on a train, Dr. Ferrer and his colleagues found, the most important sources of radiation are ones own phone, and those of ones immediat
9、e neighbours. The radiation from these sources far exceeds that from other phones or from waves bouncing around the carriage. And all these sources together produce a level of radiation within the bounds defined by the ICNIRP, the international body that regulates such matters.1 According to paragra
10、ph 1, the essential common characteristic of train carriages, buses, and lifts is that_.(A)they are all metal boxes(B) they are often stuffy and overcrowded(C) they all allow enough radiation to escape for mobile communications to take place(D)people use their mobile phones in them2 How could “level
11、s of electromagnetic radiation that exceed international safety standards“ be produced?(A)Mobile phones give off a lot of electromagnetic radiation.(B) Train carriages, buses, and lifts are not safe places to use mobile phones.(C) A lot of people could use their mobile phones in a confined space at
12、the same time.(D)Blathering produces radio waves which bounce around the interior of these places.3 Why do the Spanish researchers dispute Dr. Hondous theory?(A)Because they are funded by a mobile phone operator.(B) Because people absorb electromagnetic radiation.(C) Because electromagnetic radiatio
13、n isnt dangerous at all.(D)Because Dr. Hondou assumed that every single person was using their mobile phone at exactly the same time.4 Dr. Hondous research was not thorough enough because_.(A)he didnt have enough time to assess everything before his paper was published(B) he didnt admit that the peo
14、ple in train carriages, buses, and lifts could influence the level of electromagnetic radiation(C) he didnt investigate the effect of people on electromagnetic radiation levels(D)Japan is a crowded country where people often use mobile phones, so he only looked at that specific situation5 According
15、to the Spanish researchers, which of the following statements is true?(A)The closer you are to a mobile phone, the greater your exposure to electromagnetic radiation.(B) The closer you are to a mobile phone that is being used to send and receive signals, the greater your exposure to electromagnetic
16、radiation.(C) The amount of electromagnetic radiation reflected by metal is almost too small to be measured.(D)You shouldnt stand close to people who are using their mobile phones in train carriages, buses, and lifts.5 After taking his dog for a walk one day in the early 1940s, George de Mestral, a
17、Swiss inventor, became curious about the seeds of the burdock plant that had attached themselves to his clothes and to the dogs fur. Under a microscope, he looked closely at the hook-and-loop system that the seeds have evolved to hitchhike on passing animals and aid pollination, and he realised that
18、 the same approach could be used to join other things together. The result was Velcro: a product that was arguably more than three billion years in the making, since that is how long the natural mechanism that inspired it took to evolve.Velcro is probably the most famous and certainly the most succe
19、ssful example of biological mimicry, or “biomimetics“. In fields from robotics to materials science, technologists are increasingly borrowing ideas from nature, and with good reason: natures designs have, by definition, stood the test of time, so it would be foolish to ignore them. Yet transplanting
20、 natural designs into man-made technologies is still a hit-or-miss affair.Engineers depend on biologists to discover interesting mechanisms for them to exploit, says Julian Vincent, the director of the Centre for Biomimetic and Natural Technologies at the University of Bath in England. So he and his
21、 colleagues have been working on a scheme to enable engineers to bypass the biologists and tap into natures ingenuity directly, via a database of “biological patents“. The idea is that this database will let anyone search through a wide range of biological mechanisms and properties to find natural s
22、olutions to technological problems.Surely human intellect, and the deliberate application of design knowledge, can devise better mechanisms than the mindless, random process of evolution. Far from it. Over billions of years of trial and error, nature has devised effective solutions to all sorts of c
23、omplicated real-world problems. Take the slippery task of controlling a submersible vehicle, for example. Using propellers, it is incredibly difficult to make refined movements. But Nekton Research, a company based in Durham, North Carolina, has developed a robot fish called Madeleine that manoeuvre
24、s using fins instead.In some cases, engineers can spend decades inventing and perfecting a new technology, only to discover that nature beat them to it. The Venus flower basket, for example, a kind of deep-sea sponge, has spiny skeletal outgrowths that are remarkably similar, both in appearance and
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