计算机英语 第2版 习题答案 作者 司爱侠 张强华 参考答案v3.doc

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1、附录参考答案附录参考答案Unit1〖Ex.1〗根据课文内容回答问题(1)Ageneral-purposecomputerhasfourmainsections.Theyarethearithmeticandlogicunit(ALU),thecontrolunit,thememory,andtheinputandoutputdevices,collectivelytermedI/O.Theyareinterconnectedbybusses,oftenmadeofgroupsofwires.(2)Thecontrolunitisoftencalledacontrolsystemo

2、rcentralcontroller.(3)●Readthecodeforthenextinstructionfromthecellindicatedbytheprogramcounter.●Decodethenumericalcodefortheinstructionintoasetofcommandsorsignalsforeachoftheothersystems.●Incrementtheprogramcountersoitpointstothenextinstruction.●Readwhateverdatatheinstructionrequiresfromcells

3、inmemory,orperhapsfromaninputdevice.Thelocationofthisrequireddataistypicallystoredwithintheinstructioncode.●ProvidethenecessarydatatoanALUorregister.●IftheinstructionrequiresanALUorspecializedhardwaretocomplete,instructthehardwaretoperformtherequestedoperation.●WritetheresultfromtheALUbacktoa

4、memorylocationortoaregisterorperhapsanoutputdevice.●Jumpbacktothefirststep.(4)ThetwoclassesofoperationsALUiscapableofperformingarearithmeticandlogic.(5)LogicoperationsinvolveBooleanlogic:AND,OR,XORandNOT.(6)Acomputer'smemorycanbeviewedasalistofcellsintowhichnumberscanbeplacedorread.Eachcellha

5、sanumbered"address"andcanstoreasinglenumber.(7)ThetwoprincipalvarietiesofcomputermainmemoryarerandomaccessmemoryorRAMandread-onlymemoryorROM.(8)InaPC,thespecializedprogramcalledtheBIOSorchestratesloadingthecomputer'soperatingsystemfromtheharddiskdriveintoRAMwheneverthecomputeristurnedonorrese

6、t.(9)SoftwarethatisstoredinROMisoftencalledfirmwarebecauseitisnotionallymorelikehardwarethansoftware.209附录参考答案(10)I/Oisthemeansbywhichacomputerreceivesinformationfromtheoutsideworldandsendsresultsback.〖Ex.2〗根据下面的英文解释，写出相应的英文词汇(1)input(2)microprocessor(3)program(4)bus(5)hardware(6)memory(7)out

7、put(8)cell(9)register(10)address〖Ex.3〗把下列句子翻译为中文(1)他进城的目的是买一台新计算机。(2)大多数在线服务都有自己的浏览器。(3)软盘可以是双倍密度的或者高密度的。(4)公式包括单元的地址。(5)C语言也许最适宜被称为“中级语言”。(6)每一个浏览器都有内置的功能来理解HTML。(7)C语言是世界上最流行的计算机语言之一。(8)Java技术既是一种编程语言，也是一个平台。(9)实际上，一个视窗管理器可以被看作是命令行操作系统的图形用户