计算机英语教程课后解析.doc

Answers Unit 1 Part1 Reading and Translating Section A Ⅰ. 1. T 2. F 3. T 4. T 5. T Ⅱ. 1. C 2. C 3. B III. (1) 这一开始带来了计算历史中可谓第一个真正的竞争标志，有助于刺激计算机更快更好的发展。 (2) 虽然昂贵，但是这些机器为计算机在普通家庭中使用开启了趋势。 Section B Ⅰ. 1. T 2. F 3. F 4. F 5. T Ⅱ. 1. B 2. D 3. C III. (1) 一级存储，或称内存，是临时保存等待被处理数据的计算机内部电路。而二级存储，简称存储，是指那些永久性存储数据或信息的设备和介质。 (2) 将由DNA制成并能放置在一个单独的人体细胞中的一台生物学纳米计算机，将利用DNA作为它的软件，酶作为它的硬件，其具有分子大小尺寸的电路将只有通过显微镜才能构够看见。 Section C Ⅰ. 1. T 2. F 3. F 4. T 5. F Ⅱ. 1. C 2. B 3. D III. (1) 一个目前最先进的成本低于1000美元的处理器能够提供与20世纪80年代耗资超过1百万美元的巨型计算机相同的处理能力。 (2) 由于制造处理器所使用的小型化和新材料，计算机制造商可以将更多的硬件组件塞进机器，提供更快的处理速度和更大的数据存储容量。 Part3 Listening and Speaking Listening Comprehension 1. B 2. A 3. D Original Roadrunner On the current TOP 500 list of worldwide supercomputers released in June 2008, Roadrunner, IBMs new super computer, is rated No.1, exceeding IBM Blue Gene, the former No.1 on the list. IBM calls Roadrunner the world’s first “hybrid” supercomputer. It combines 12,960 IBM Cell chips, which power Sonys PlayStation 3 video game machine, with 6,948 dual-core AMD Opteron chips and 80 terabytes of memory. It runs Red Hat Linux. Roadrunner is billed at the fastest in the world, operating at one petaflop or one thousand trillion calculations per second. So, exactly how fast is the supercomputer? IBM said the speed is roughly equivalent to the combined computing power of 100,000 of todays fastest laptop computers - users would need a stack of laptops 1.5 miles high to match Roadrunners performance. It would also take the entire population of the earth - about 6 billion people - each working a handheld calculator at the rate of 1 second per calculation more than 46 years to do what Roadrunner can do in one day. IBM said that in the past 10 years, supercomputer power has increased about 1,000 times. Today, just three of Roadrunners 3,456 tri-blade units have the same power as the 1998 fastest computer. Now, a complex physics calculation that will take Roadrunner one week to complete would hav