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用户线路常见六种障碍

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断线、混线、地气、绞线、绝缘不良、串杂音

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试题分类: 写作
练习次数:0次
TEXTB Whatweknowofprenataldevelopmentmakesallthisattemptmadebyamothertomoldthecharacterofherunbornchildbystudyingpoetry,art,ormathematicsduringpregnancyseemutterlyimpossible.Howcould suchextremelycomplexinfluencespassfromthemothertothechild?Thereisnoconnectionbetweentheirnervoussystems.Eventhebloodvesselsofmotherandchilddonotjoindirectly.Anemotionalshocktothemotherwillaffectherchild,becauseitchangestheactivityofherglandsandsothechemistryherblood.Anychemicalchangeinthemother'sbloodwillaffectthechildforbetterorworse.Butwecannotseehowalooking formathematicsorpoeticgeniuscanbedissolvedinbloodandproduceasimilarlikingorgeniusinthechild. Inourdiscussionofinstinctswesawthattherewasreasontobelievethatwhateverweinheritmustbeof someverysimplesortratherthananycomplicatedorverydefinitekindofbehavior.Itiscertainthatnoone inheritsaknowledgeofmathematics.Itmaybe,however,thatchildreninheritmoreorlessofarathergeneral abilitythatwemaycallintelligence.Ifveryintelligentchildrenbecomedeeplyinterestedinmathematics,they willprobablymakeasuccessofthatstudy. Asformusicalability,itmaybethatwhatisinheritedisanespeciallysensitiveear,apeculiarstructureofthe handsorthevocalorgansconnectionsbetweennervesandmusclesthatmakeitcomparativelyeasytolearnthe movementsamusicianmustexecute,andparticularlyvigorousemotions.Ifthesefactorsareallorganized aroundmusic,thechildmaybecomeamusician.Thesamefactors,inothercircumstancemightbeorganized aboutsomeothercenterofinterest.Therichemotionalequipmentmightfindexpressioninpoetry.Thecapable fingersmightdevelopskillinsurgery.Itisnottheknowledgeofmusicthatisinherited,thennoreventheloveof it,butacertainbodilystructurethatmakesitcomparativelyeasytoacquiremusicalknowledgeandskill. Whetherthatabilityshallbedirectedtowardmusicorsomeotherundertakingmaybedecidedentirelybyforces intheenvironmentinwhichachildgrowsup. 6.Whichofthefollowingstatementsisnottrue? A.Somemotherstrytoinfluencetheirunbornchildrenbystudyingartandothersubjectsduringtheir pregnancy. B.Itisutterlyimpossibleforustolearnanythingaboutprenataldevelopment. C.Thebloodvesselsofmotherandchilddonotjoindirectly. D.Therearenoconnectionbetweenmother'snervoussystemsandherunbornchild's. 7.Amotherwillaffectherunbornbabyontheconditionthat____. A.sheisemotionallyshocked B.shehasagoodknowledgeofinheritance C.shetakespartinallkindofactivities D.shestickstostudying 8.Accordingtothepassage,achildmayinherit____. A.everythingfromhismotherB.aknowledgeofmathematics C.arathergeneralabilitythatwecallintelligence D.hermother'smusicalability 9.Ifachildinheritssomethingfromhismother,suchasanespeciallysensitiveear,apeculiarstructureofthe handsorofthevocalorgans,hewill____. A.surelybecomemusician B.mostlybecomeapoet C.possiblybecomeateacher D.becomeamusicianontheconditionthatallthesefactorsareorganizedaroundmusic 10.Whichofthefollowingisthebesttitleforthepassage? A.RoleofInheritance. B.AnUnbornChild. C.Functionofinstincts. D.InheritedTalents.
试题分类: 专业英语四级
练习次数:2次
SellingDigitalMusicwithoutCopy-protectionMakesSense A. Itwasuncharacteristicallylow-keyfortheindustry’sgreatestshowman.ButtheessaypublishedthisweekbySteveJobs,thebossofApple,onhisfirm’swebsiteundertheunassumingtitle“ThoughtsonMusic”hasnonethelessprovokedavigorousdebateaboutthefutureofdigitalmusic,whichAppledominateswithitsiPodmusic-playerandiTunesmusic-store.Atissueis“digitalrightsmanagement”(DRM)—thetechnologyguardingdownloadedmusicagainsttheft.SincethereisnocommonstandardforDRM,italsohastheside-effectthatsongspurchasedforonetypeofmusic-playermaynotworkonanother.Apple’sDRMsystem,calledFairPlay,isthemostwidespread.SoitcameasasurprisewhenMr.JobscalledforDRMfordigitalmusictobeabolished. B. ThisisachangeoftackforApple.IthascomeunderfirefromEuropeanregulatorswhoclaimthatitsrefusaltolicenseFairPlaytootherfirmshas“lockedin”customers.SincemusicfromtheiTunesstorecannotbeplayedonnon-iPodmusic-players(atleastnotwithoutalotoffiddling),anyiTunesbuyerwillbedeterredfromswitchingtoadevicemadebyarivalfirm,suchasSonyorMicrosoft.WhenFrenchlawmakersdraftedabilllastyearcompellingAppletoopenupFairPlaytorivals,thecompanywarnedof“state-sponsoredpiracy”.OnlyDRM,itimplied,couldkeepthepiratesatbay. C. ThisweekMr.JobsgaveanotherexplanationforhisformerdefenceofDRM:therecordcompaniesmadehimdoit.TheywouldmaketheirmusicavailabletotheiTunesstoreonlyifAppleagreedtoprotectitusingDRM.TheycanstillwithdrawtheircataloguesiftheDRMsystemiscompromised.ApplecannotlicenseFairPlaytoothers,saysMrJobs,becauseitwoulddependonthemtoproducesecurityfixespromptly.AllDRMdoesisrestrictconsumerchoiceandprovideabarriertoentry,saysMrJobs;withoutittherewouldbefarmorestoresandplayers,andfarmoreinnovation.So,hesuggests,whynotdoawaywithDRMandsellmusicunprotected?“Thisisclearlythebestalternativeforconsumers,”hedeclares,“andApplewouldembraceitinaheartbeat.” D. Whythesuddenchangeofheart?MrJobsseemschieflyconcernedwithgettingEurope’sregulatorsoffhisback.RatherthancomplainingtoAppleaboutitsuseofDRM,hesuggests,“thoseunhappywiththecurrentsituationshouldredirecttheirenergiestowardspersuadingthemusiccompaniestoselltheirmusicDRM-free.”Twoandahalfofthefourbigrecordcompanies,hehelpfullypointsout,areEuropean-owned.MrJobsalsohopestopainthimselfasaconsumerchampion.AppleresentsaccusationsthatithasbecometheMicrosoftofdigitalmusic. E. Applecanaffordtoembraceopencompetitioninmusicplayersandonlinestores.Consumerswouldgravitatetothebestplayerandthebeststore,andatthemomentthatstillmeansApple’s.MrJobsisevidentlyunfazedbyrivalstotheiPod.Sinceonly3%ofthemusicinatypicaliTuneslibraryisprotected,mostofitcanalreadybeusedonotherplayerstoday,henotes.(AndeventheprotectedtrackscanbeburnedontoaCDandthenre-ripped.)SoApple’sdominanceevidentlydependsfarmoreonbrandingandeaseofusethanDRM-related“lockin”. F. ThemusicgiantsaretryingDRM-freedownloads.Lotsofsmallerlabelsalreadysellmusicthatway.Havingseenwhichwaythewindisblowing,MrJobsnowwantstobeseennotasDRM’sdefender,butasaconsumerchampionwhohelpedinitsdownfall.Wouldn’titleadtoasurgeinpiracy?No,becausemostmusicisstillsoldunprotectedonCDs,peoplewishingtostealmusicalreadycandoso.Indeed,scrappingDRMwouldprobablyincreaseonline-musicsalesbyreducingconfusionandincompatibility.Withtheleadingonlinestore,Applewouldbenefitmost.MrJobs’sargument,inshort,istransparentlyself-serving.Italsohappenstoberight. NotestoReadingPassage1 1.low-key: 抑制的,受约束的,屈服的 2.showman: 开展览会的人,出风头的人物 3.unassuming: 谦逊的,不夸耀的,不装腔作势的 4.iPod: (苹果公司出产的)音乐播放器 5.iTunesstore: (苹果公司出产的)在线音乐商店 6.getoffperson’sback: 不再找某人的麻烦,摆脱某人的纠缠 7.gravitate: 受吸引,倾向于 8.unfazed: 不再担忧,不被打扰 Questions1-7 DothefollowingstatemetsreflecttheclaimsofthewriterinReadingPassage1? WriteyouranswerinBoxes1-7onyouranswersheet. TRUEifthestatementrefletstheclaimsofthewriter FALSEifthestatementcontradictstheclaimsofthewriter NOTGIVENifitisimpossbiletosaywhatthewriterthinksaboutthis 1.AppleenjoysacontrollingpositionindigitalmusicmarketwithitsiPodmusic-playerandiTunesmusic-store. 2.DRMisagovernmentdecreeissuedwithapurposetoprotectdownloadedmusicfromtheftbyconsumers. 3.LackofstandardizationinDRMmakessongsboughtforonekindofmusicplayermaynotfunctiononanother. 4.ApplehasbeencriticizedbyEuropeanregulatorssinceithasrefusedtograntalicenseFairPlaytootherfirms. 5.Allmusiccanbeeasilyplayedonnon-iPodmusicdevicesfromSonyorMicrosoftwithouttoomuchfiddling. 6.AppledependsfarmoreonDRMratherthanbrandingforitsdominanceofthedigitalmusicdevices. 7.IfDRMwascancelled,Sonywouldcertainlydominatetheinternationaldigitalmusicmarket. Questions8-10 ChoosetheappropriatelettersA-Dandwritetheminboxes8-10onyouranswesheet. 8.WhichofthefollowingstatementsaboutMr.Jobs’ideaofDRMisNOTTRUE? A.DRMplacesrestrictionsonconsumer’choiceofdigitalmusicproductsavailable. B.DRMcomplesiTunesbuyerstoswitchtoadevicemadebySonyorMicrosoft. C.DRMconstitutesabarrierforpotentialconsumerstoenterdigitalmusicmarkets. D.DRMhindersdevelopmentofmorestoresandplayersandtechnicalinnovation. 9.Theword“unfazed”inline3ofparagraphE,means___________. A.refused B.welcomed C.notbothered D.notwellreceived 10.WhichofthefollowingstatementsisTRUEifDRMwasscapped? A.Sonywouldgainthemostprofit. B.Morecustomerswouldbe“lockedin”. C.Asuddenincreaseinpiracywouldoccur. D.Online-musicsaleswouldprobablydecrease. Questions11-14 Completethenotesbelow. ChooseNOMORETHANTHREEWORDSfromReadingPassage1foreachanswer. Writeyouranswersinboxes11-14onyouranswersheet. Mr.SteveJobs,thebossofApple,explainsthereasonwhyheusedtodefendDRM,sayingthatthecompanywasforcedtodoso:therecordcompanieswouldmaketheirmusicaccessibleto…11...onlyiftheyagreedtoprotectitusingDRM;theycanstill…12…iftheDRMsystemiscompromised.HealsoprovidesthereasonwhyAppledidnotlicenseFairPlaytoothers:thecompanyreliesonthemto…13….ButnowhechangeshismindwithapossibleexpectationthatEurope’sregulatorswouldnottroublehimanymoreinthefuture.Heproposesthatthosewhoareunsatisfactorywiththecurrentsituationindigitalmusicmarketshould…14…towardspersuadethemusiccompaniestoselltheirmusicDRM-free.
试题分类: 阅读
练习次数:23次
Passage2 Questions6to10arebasedonthefollowingpassage: Thehumanbraincontains10thousandmillioncellsandeachofthesemayhaveathousandconnections.(77)Suchenormousnumbersusedtodiscourageusandcauseustodismissthepossibilityofmakingamachinewithhuman-likeability,butnowthatwehavegrownusedtomovingforwardatsuchapacewecanbelesssure.Quitesoon,inonly10or20yearsperhaps,wewillbeabletoassembleamachineascomplexasthehumanbrain,andifwecanwewill.Itmaythentakeusalongtimetorenderitintelligentbyloadingintherightsoftware(软件)orbyalteringthearchitecturebutthattoowillhappen. (78)Ithinkitcertainthatindecades,notcenturies,machinesofsilicon(硅)willarisefirsttorivalandthenexceedtheirhumanancestors.Oncetheyexceedustheywillbecapableoftheirowndesign.Inarealsensetheywillbeabletoreproducethemselves.Siliconwillhaveendedcarbon’slongcontrol.Andwewillnolongerbeabletoclaimourselvestobethefinestintelligenceintheknownuniverse. Astheintelligenceofrobotsincreasestomatchthatofhumansandastheircostdeclinesthrougheconomiesofscalewemayusethemtoexpandourfrontiers,firstonearththroughtheirabilitytowithstandenvironments,harmfultoourselves.Thus,desertsmaybloomandtheoceanbedsbemined.Furtherahead,byacombinationofthegreatwealththisnewagewillbringandthetechnologyitwillprovide,theconstructionofavast,man-createdworldinspace,hometothousandsormillionsofpeople,willbewithinourpower. 6.Inwhatwaycanwemakeamachineintelligent? A)Bymakingitworkinsuchenvironmentsasdeserts,oceansorspace. B)Byworkinghardfor10or20years. C)Byeitherproperlyprogrammingitorchangingitsstructure. D)Byreproducingit.(C) 7.Whatdoesthewriterthinkaboutmachineswithhuman-likeability? A)Hebelievestheywillbeusefultohumanbeings. B)Hebelievesthattheywillcontrolusinthefuture. C)Heisnotquitesureinwhatwaytheymayinfluenceus. D)Hedoesn’tconsidertheconstructionofsuchmachinespossible. 8.Theword“carbon”(Line4,Para.2)standsfor________. A)intelligentrobotsB)achemicalelementC)anorganicsubstanceD)humanbeings(D) 9.Arobotcanbeusedtoexpandourfrontierswhen________. A)itsintelligenceandcostarebeyondquestion B)itisabletobeartheroughenvironment C)itismadeascomplexasthehumanbrain D)itsarchitectureisdifferentfromthatofthepresentones(A) 10.Itcanbeinferredfromthepassagethat________. A)aftertheinstallationofagreatnumberofcellsandconnections,robotswillbecapableofself-reproduction B)withtherapiddevelopmentoftechnology,peoplehavecometorealizethepossibilityofmakingamachinewithhuman-likeability C)oncewemakeamachineascomplexasthehumanbrain,itwillpossesintelligence D)robotswillhavecontrolofthevast,man-madeworldinspace
试题分类: 成人英语三级
练习次数:0次
PARTVREADINGCOMPREHENSION Inthissectiontherearefourpassagesfollowedbyquestionsorunfinishedstatements,eachwithfoursuggestedanswersmarkedA,B,CandD.Choosetheonethatyouthinkisthebestanswer. TEXTA Racket,dinclamor,noise,whateveryouwanttocallit,unwantedsoundisAmerica'smostwidespread nuisance.Butnoiseismorethanjustanuisance.Itconstitutesarealandpresentdangertopeople'shealth.Day andnight,athome,atwork,andatplay,noisecanproduceseriousphysicalandpsychologicalstress.Nooneis immunetothisstress.Thoughweseemtoadjusttonoisebyignoringit,theear,infact,neverclosesandthe bodystillresponds—sometimeswithextremetension,astoastrangesoundinthenight. Theannoyancewefeelwhenfacedwithnoiseisthemostcommonoutwardsymptomofthestressbuilding upinsideus.Indeed,becauseirritabilityissoapparent,legislatorshavemadepublicannoyancethebasisof manynoiseabatementprograms.Themoresubtleandmoreserioushealthhazardsassociatedwithstress causedbynoisetraditionallyhavebeengivenmuchlessattention.Nevertheless,whenweareannoyedormade irritablebynoise,weshouldconsiderthesesymptomsfairwarningthatotherthingmaybehappeningtous, someofwhichmaybedamagingtoourhealth. Ofmanyhealthhazardstonoise,hearinglossisthemostclearlyobservableandmeasurablebyhealth professionals.Theotherhazardsarehardertopindown.Formanyofus,theremaybeariskthatexposuretothe stressofnoiseincreasessusceptibilitytodiseaseandinfection.Themoresusceptibleamongusmayexperience noiseasacomplicatingfactorinheartproblemsandotherdiseases.Noisethatcausesannoyanceandirritability inhealthpersonsmayhaveseriousconsequencesforthesealreadyillinmindorbody. Noiseaffectsusthroughoutourlives.Forexample,thereareindicationsofeffectsontheunbornchildwhen mothersareexposedtoindustrialandenvironmentalnoise.Duringinfancyandchildhood,youngstersexposed tohighnoiselevelsmayhavetroublefallingasleepandobtainingnecessaryamountsofrest. Why,then,istherenotgreateralarmaboutthesedangers?Perhapsitisbecausethelinkbetweennoiseand manydisabilitiesordiseaseshasnotyetbeenconclusivelydemonstrated.Perhapsitisbecausewetendto dismissannoyanceasapricetopayforlivinginthemodernworld.Itmayalsobebecausewestillthinkof hearinglossasonlyanoccupationalhazard. 1.InParagraph1,thephrase"immuneto"areusedtomean___. A.unaffectedby B.hurtby C.unlikelytobeseenby D.unknownby 2.Theauthor'sattitudetowardnoisewouldbestbedescribedas___. A.unrealistic B.traditional C.concerned D.hysterical 3.Whichofthefollowingbeststatesthemainideaofthepassage? A.Noiseisamajorproblem;mostpeoplerecognizeitsimportance. B.Althoughnoisecanbeannoying,itisnotamajorproblem. C.Noiseisamajorproblemandhasnotyetbeenrecognizedassuch. D.Noiseisamajorproblemaboutwhichnothingcanbedone. 4.Theauthorcondemnsnoiseessentiallybecauseit___. A.isagainstthelaw B.canmakesomepeopleirritable C.isanuisance D.inagangertopeople'shealth 5.Theauthorwouldprobablyconsiderresearchabouttheeffectsnoisehasonpeopletobe___. A.unimportant B.impossible. C.awasteofmoney D.essential
试题分类: 专业英语四级
练习次数:1次
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