2022年职称英语考试《理工类》C类真题（阅读理解：第三篇）.docx

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1、2022年职称英语考试理工类C类真题（阅读理解：第三篇）CompactDisksIfsomeonesaystoyouyourmusicCDsdon'treallyholdanymusiconthem,andtheyonlyhavenumbersrecordedonthem,youmaynotbelieveit.Infact,heisrightinthatsoundisactuallyrecordedontotheCDsasspecialnumbersadigitalcode.1ThecodeispressedontotheCDasbumpsonalongspiraltrackalmos

2、tfivekilometerslong.Thesebumpsareanaverageof0.5micronswide.AsmalllaserbeamshinesontothebumpsastheCDturns.Thelightisreflectedbacktoareceiverthatrecordshowthelaserlightbouncesback.ThisletstheCDplayer2turnthereflectedlightbackintotheoriginalcode.Thismeansyoucanheartheoriginalcodeasmusic.Digitalcodesare

3、usedwithmanytechnologies.E-mailneedsthesekindsofcodenumbers.Spaceprobescommunicatewiththeirgroundstationonearthusingdigitalcodes.Barcodesarereadasdigitalcodesincomputersystems.Digitalcommunicationswithcellphonesneeddigitalcodes.Weatherradiosalsotuneintospecificsignalsusingthesecodes.Therearemanytype

4、sofcompactdisks.OneformatiscalledCD-RWs.Theycanberecordedonandre-recordedon(rewrittenon)asyouwoulddowithafloppydisk3.AnotherformatistheCD-ROM.ThetechnologyforrecordingonthesedisksisdifferentfromotherCDs.TheseCDshaveadyelayerthattheCDwritercandarkenorleaveclear.Theclearanddarkspotsarethedigitalcode.C

5、D-ROMstandsforCompactDiscReadOnlyMemory4.Thisdiskislikeasuperfloppydiskthatcanholdlotsofinformation.OneCD-ROMcanholdthesameamountofdataas500floppydisks.Informationispermanentlyrecordedontoit.ComputergamesandotherprogramsareconsideredtobeCD-ROMs.CDswerefirstsoldtothepublicin1982TheseCDsstillplaywella

6、ndsoundfine.CurrentCDsareexpectedtolastbetween70to200years.Ofcourse,youcanmakesureyourCDslastalongtimebytakingcareofthem.Sciencekeepsondeveloping.Itmaynotbemanymoreyearsbeforeacompletelynewtechnologyisinvented5andintroducedtothepublicformusicrecording.Inthemeantime,thereisnodoubtyouwillcontinuetoenj

7、oylisteningtoyourfavoritemusiconCDs6andplayingyourfavoritecomputergamesonCD-ROMs.1MusicisrecordedontoCDsasAlaserbeamsBdigitalcodesCmusicalnotesDspecialsounds查看原文2E-mailismentionedinthethirdparagraphtoshowAthevarietyofdigitalcommunicationsBthedevelopmentofnewtechnologiesCtheusefulnessofdigitalcodesDt

8、herelationshipbetweencommunicationandtechnology查看原文3OneofthedifferencesbetweenCD-RWsandCD-ROMsisACD-ROMscanbeusedforlongertimeBCD-ROMscannotberewrittenonCCD-RWsholdmoreinformationDCD-RWsaremerelyusedformusicrecording查看原文4CDscanlastalongtimeifAtheyareseldomusedBtheyplaywellandsoundfineCtheiruserstake

9、goodcareofthemDtheyaredevelopedwithnewtechnology查看原文5ItcanbeinferredfromthepassagethatACD-ROMsaremoreexpensivethanotherCDsBnewtechnologyformusicrecordingisbeingdevelopedCtheauthorlikeslisteningtomusicDflppydisksarenolongerinuse查看原文第4页 共4页第 4 页 共 4 页第 4 页 共 4 页第 4 页 共 4 页第 4 页 共 4 页第 4 页 共 4 页第 4 页 共 4 页第 4 页 共 4 页第 4 页 共 4 页第 4 页 共 4 页第 4 页 共 4 页