《2015考研英语阅读理解精读P25—工学类》由会员分享，可在线阅读，更多相关《2015考研英语阅读理解精读P25—工学类（5页珍藏版）》请在金锄头文库上搜索。
1、凯程考研辅导班，中国最强的考研辅导机构，http:/ 考研就找凯程考研，学生满意，家长放心，社会认可！凯程考研，考研机构，10 年高质量辅导，值得信赖！ 以学员的前途为已任，为学员提供高效、专业的服务，团队合作,为学员服务，为学员引路。2015 考研英语阅读理解精读 P25工学类Passage 25Many people think that information technology and biotechnology will rule the 21st century. Robert Birge, a chemist at the University of Connecticut,
2、is trying to combine them, by making computer memories out of protein.The protein in question is bacteriorhodopsin (bR), a molecule that undergoes a structural change when it absorbs light. By using genetic engineering to tweak wild bR from a bacterium called Halobacterium salinarum, Dr Birge and hi
3、s colleagues have made a variety of the molecule that they claim is well-suited to act as an element of a computers memory. Hit with a green light, it adopts one shape. Hit subsequently with a red light, it twists itself into another. Then, if hit with blue light, it resets itself into its original
4、state.To make a memory from the protein, Dr Birge suspends elements made from it in a transparent plastic cube known as a cuvette. A pair of lasers arranged at right angles to one another write data into the cuvette by shining in turn on slices through the plastic matrix. The first laser, which prod
5、uces green light, sweeps the whole cuvette, causing its protein contents to take on a shape that (in binary code) is designated as zero. The second laser, which produces red light, then stimulates particular sites to take the second shape. This corresponds to one in binary code. Once the lasers are
6、switched off, data recorded this way will, according to Dr Birge, remain stable for more than 12 years.To read the stored data, a low-powered red laser is shone slice by slice through the cuvette. This does not disturb the conformation of the protein molecules; but those in state zero absorb light a
7、t this wavelength. A machine placed behind the cuvette detects this absorption pattern and translates it into the appropriate string of ones and zeroes. Once the contents have been read into a more conventional storage device, the cuvette can be wiped clean and reset by illuminating it with a blue l
8、aser.Dr Birge says that each cuvette can now hold about seven gigabytes of data (a small laptop computer might have about this much space on its hard drive). He hopes to boost that figure to ten gigabytes by finding a better-performing variety of the protein. Only those with deep pockets, however, c
9、ould afford the $25,000 cost of each device.Luckily for Dr Birge, the deep-pocketed American air force thinks that bR cuvettes could be a good way to equip its aircraft and satellites with light, high-density devices to store the mountains of images collected during reconnaissance missions. A protei
10、n-based memory is particularly suitable for this, because the bR molecule is robust enough to withstand the barrage of radiation from space that wreaks havoc on conventional magnetic-memory devices operating at high altitude.注(1)：本文选自 Economist; 12/22/2001, p94, 1/2p, 1c;凯程考研辅导班，中国最强的考研辅导机构，http:/ 考
11、研就找凯程考研，学生满意，家长放心，社会认可！凯程考研，考研机构，10 年高质量辅导，值得信赖！ 以学员的前途为已任，为学员提供高效、专业的服务，团队合作,为学员服务，为学员引路。注(2)：本文习题命题模仿对象 2001 年真题 Text 3(第一题到第三题); 2004 年真题 Text 1(第四题和第五题);1. What is the passage mainly about?AWhat will rule the 21st century.BHow bacterial protein can be used in computers.CWhat we can get from bact
12、erial protein.DHow to make bacterial protein.2. The application of bR turns out to be_.Avery trustworthyBrather superficialCsomewhat contradictoryDquite encouraging3. The basic problem of applying bR to computer lies in _.Alimited space on hard driveBits complexityCits high priceDits limited users4.
13、 Which of the following is not the advantage of bR?AWorking at higher altitude.BLight weight.CHigh density.DSafe from strong radiation.5. Which of the following is true according to the text?AbR has a wide variety of application in life.BThe protein molecules have stable characteristics.CThe data re
14、corded with bR can be kept for a long time.DThe new device will replace conventional storage device.答案：BDCAC篇章剖析本文论述了信息技术和生物工程学如何完美地结合在用蛋白质做电脑存储器这一新技术当中。第一段引出论点;第二段、三段和四段详细介绍这一技术的具体实施; 第五段和六段介绍这一技术的应用情况。词汇注释bacteriorhodopsin n.细菌视紫红质，类似于视紫红质的亲盐杆菌属，出现在细菌细胞膜上的紫色色素，它把阳光直接转变成化学能。tweak vt. 扭，拧，掐;调节;调整hit
15、 vt. 瞬时干扰;瞬时中断deep pocket 财富，资产havoc n. 大破坏; 蹂躏; 毁坏; 浩劫; 大混乱play raise havoc with among 对.造成严重破坏, 使.陷入大混乱wreak vt. 泄(怒); 雪(恨); 惩罚, 古报仇;施加, 造成(祸灾)难句突破A pair of lasers arranged at right angles to one another write data into the cuvette by shining 凯程考研辅导班，中国最强的考研辅导机构，http:/ 考研就找凯程考研，学生满意，家长放心，社会认可！凯程考研
16、，考研机构，10 年高质量辅导，值得信赖！ 以学员的前途为已任，为学员提供高效、专业的服务，团队合作,为学员服务，为学员引路。in turn on slices through the plastic matrix.主体句式：A pair of lasers write data 结构分析：本句是一个简单句。句子的主语是“a pair of lasers”，“arranged at right angles to one another”是后置定语，用来修饰主语 ;谓语是 “write”;“by”做伴随状语，短语“in turn”意思是“轮流”。句子译文：一对事先调整到一个合适角度的激光器通过塑料矩阵轮流在“切片”上闪烁，这
