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下列寻址方式中，执行速度最快的是( )。
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下列指令中执行速度最快的指令是
ADDAX，10
ADDAL，[SI+10H]
ADDAX，CX
ADDAX，[BX]
使用用WinRAR压缩文件时执行速度最快的压缩方式是
存储
最快
较快
最好
在指令系统的各种寻址方式中获取操作数最快的方式是若操作数的地址包含在指令中则属于方式 在指令
直接寻址
立即寻址
寄存器寻址
间接寻址
下列80×86指令系统的寻址方式中存取操作数的速度哪一种最快
存储器直接寻址
寄存器寻址
寄存器间接寻址
寄存器相对寻址
下列微指令的编码方式中执行速度最快的是
直接编码
字段直接编码
字段间接编码
无法判断
在8086微机中立即直接间接寻址方式中指令的执行速度最慢的是
立即寻址
直接寻址
间接寻址
直接和间接寻址
直接寻址间接寻址立即寻址3种寻址方式指令的执行速度由快至慢的排序是
直接、立即、间接
直接、间接、立即
立即、直接、间接
立即、间接、直接
寻址方式按操作数的物理位置不同多使用型和型前者比后者执行速度快
下列80x86指令系统的寻址方式中存取操作数的速度最快
存储器直接寻址
寄存器寻址
寄存器间接寻址
寄存器相对寻址
以下取得操作数速度最快的寻址方式是1
基址寻址
寄存器寻址
立即数寻址
存储器间接寻址
在下列寻址方式中取得操作数的速度最快
直接寻址
寄存器寻址
立即寻址
寄存器间接寻址
直接间接立即3种寻址方式指令的执行速度由快至慢的排序为
直接、立即、间接
直接、间接、立即
立即、直接、间接
不一定
下列80x86指令系统的寻址方式中存取操作数的速度哪一种最快
存储器直接寻址
寄存器寻址
寄存器间接寻址
寄存器相对寻址
获取操作数速度最快的寻址方式是
立即寻址
直接寻址
间接寻址
寄存器寻址
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把逻辑地址转换成绝对地址的工作称为______或______
计算机系统的二级存储包括
什么是虚拟存储器在页式存储管理系统中如何实现虚拟存储器
存储管理的功能有__________________和______
在页式存储管理中程序的逻辑地址空间被划分成若干______主存的绝对地址空间被划分成与______大小相同的______
46Theclimaticphenomenonthatisbeingblamedforfloodshurricanesandearlysnowstormsalsodeservescreditforencouragingplantgrowthandhelpingtocontrolthepollutantlinkedtoglobalwarminganewstudyshows.E1Nino—theperiodicwarmingofeasternPacificOceanwaters—causesaburstofplantgrowththroughouttheworldandthisremovescarbondioxidefromtheatmosphereresearchershavefound.47ThenewstudyshowsthatnaturalweathereventssuchasthebriefwarmingcausedbyE1Ninohaveamuchmoredramaticeffectthanpreviouslybelievedonhowmuchcarbondioxideisabsorbedbyplantsandhowmuchofthegasisexpelledbythesoil.AtmosphericcarbondioxideorCO2hasbeenincreasingsteadilyfordecades.Thisisthoughttobecausedbyanexpandeduseoffossilfuelsandbytopplingoftropicalforests.ScientistshavelinkedtheCO2risetoglobalwarmingaphenomenonknownasthegreenhouseeffect.48Alarmednationsoftheworldnowaredrawingupnewconservationpoliciestoreducefossilfuelburninginhopesofreducinggreenhousegasesintheatmosphere.ButDavidSchimeloftheNationalCenterforAtmosphericResearchaco-authorofthenewstudysaysthatbeforedetermininghowmuchtoreducefossilfuelburningweshouldconsidertheeffectsofnaturalclimatevariationsontheabilityofplantstoabsorbCO2.SchimelsaidsatellitemeasurementsofCO2plantgrowthandtemperatureshowthatnaturalwarmingeventssuchasE1NinoatfirstcausemoreCO2tobereleasedintotheatmosphereprobablyastheresultofaccelerateddecayofdeadplantmatterinthesoil.Butlaterwithintwoyearsthereisanexplosionofgrowthinforestsandgrasslandswhichmeansplantssuckmorecarbondioxideoutoftheatmosphere.WethinkthatthereisadelayedresponseinvegetationandsoiltothewarmingeffectsofsuchphenomenaasE1NinoandthisleadstoincreasedplantgrowthsaidSchimel.49HoweverhesaiditisnotclearwhetherthewarmingbyE1NinocausesanetdecreaseinthebuildupofCO2overthelonghaul.Wedon’treallyknowthatyetsaidSchimel.WhatthestudydoesshowhoweveristhattheriseandfallofCO2intheatmosphereisstronglyinfluencedbynaturalchangesinglobaltemperaturesaidB.H.BraswelloftheUniversityofNewHampshireanotherco-authorofthestudy.Braswellsaidthatinyearswhentheglobalweatheriscoolerthannormalthereisadecreaseinboththedecayofdeadplantsandinnewplantgrowth.ThiscausesaneffectthatistheoppositeofE1Ninowarming:CO2atmospherelevelsfirstdeclineandlaterincrease.50IthinkwehavedemonstratedthattheecosystemhasalotmoretodowithclimatechangethanwaspreviouslybelievedsaidBraswellFocusingontheroleofhumanactivityinclimatechangeisimportantbutmanmadefactorsarenottheonlyfactors./
采用静态重定位必须借助硬件的地址转换机构程序执行过程中可以在主存储器中被移动
Aconventionalteacher’slicenseeusuallyrequiresauniversitydegreeineducationplusanunpaidtermofpracticeteaching.Thishasnevermademuchsense.Itexcludesbrightstudentswhotakedegreesinothersubjectsandmightteachthosesubjects;itiscostlyandtime-consumingforcareer-switcherswhomustwaitayearormorebeforetheycanenteraclassroom;itissorigidthatprivate-schoolteachersoruniversityprofessorswithyearsofexperiencehavetojumpthroughhoopsbeforetheycanstartteachinginastateschool.Andthereisvirtuallynoevidencethatitcreatesbetterteachers.Forallthatitisstronglybackedbyschoolsofeducationwhichhaveamonopolyofteacher-trainingandbyteachers’unionswhosemembersmakemoremoneywhenitisartificiallyhardforotherstogetintotheprofession. Nowsome45statesandtheDistrictsofColumbiaofferan"alternativeroute"toateacher’slicenseeupfromonlyahandfulinthe1980s.AlternativecertificationACgenerallyallowsindividualswithauniversitydegreetobeginteachingimmediatelyafterpassinganentranceexamination.Theserecruitswatchedoverbyamentorteachthesubjecttheystudiedatuniversityandtakeeducationcoursesatasponsoringuniversitywhiledrawingtheirsalaries. ThetraditionalsortofAmericanteacherislikelytobeyoungwhiteandfemale.Alternativecertificationattractsmoremenandmorenon-whites.InTexasforinstanceroughly90%ofpublic-schoolteachersarewhitebut40%ofthosewhohavejoinedthroughalternativecertificationarenon-whites.TheACroutealsodrawsteacherswillingtogowheretheyaremostneeded.AsurveyofTroopstoTeachersaprogramthatturnsexsoldiersintopublic-schoolteachers"Proudtoserveagain"foundthat39%ofthosetakingpartarewillingtoteachininner-cityschoolsand68%inruralareas. AretheygoodteachersOfficialdomisreluctanttoreleasethedetailswhichmightanswerthatquestionforcertain.Butanecdotalevidencesuggeststheydowell.InNewJerseywhichhasbeenrunningthissortofprogramsince1984richdistrictswhichcanaffordtobechoosyconsistentlyhiremoreACteachersthanpoordistrictsdo.InHoustonTexaswheretheTeachofAmericaprogramTFAputsrecentuniversitygraduatesintopoorcommunitiesasteachersthemosteffectiveteachersaregenerallytheTFAones."Schoolprincipalsareourbiggestfans"WendyKoppTFA’spresidentsaysproudly. Sowhynotscrapthecumbersometeacher-licensinglawsFrederickHessaprofessorattheUniversityofVirginiahaswrittenapaperfortheProgressivePolicyInstitutearguingthatteacher-licensingoughttobestrippedtothebareessentials.Prospectiveteachersshouldberequiredonlytoholdacollegedegreepassatestofessentialskillsandbecheckedtomakesuretheydonothaveacriminalbackground.OthertrainingisimportantarguesMr.Hessbutthemarketnotstatelegislatorsshoulddecidewhatthattraininglookslike.Thisnotionof"competitivecertification"hasdrawnfavorableattentionfromtheBushadministration. Howdoestheauthorfeelabouttheconventionalteacher’straining
46Theclimaticphenomenonthatisbeingblamedforfloodshurricanesandearlysnowstormsalsodeservescreditforencouragingplantgrowthandhelpingtocontrolthepollutantlinkedtoglobalwarminganewstudyshows.E1Nino—theperiodicwarmingofeasternPacificOceanwaters—causesaburstofplantgrowththroughouttheworldandthisremovescarbondioxidefromtheatmosphereresearchershavefound.47ThenewstudyshowsthatnaturalweathereventssuchasthebriefwarmingcausedbyE1Ninohaveamuchmoredramaticeffectthanpreviouslybelievedonhowmuchcarbondioxideisabsorbedbyplantsandhowmuchofthegasisexpelledbythesoil.AtmosphericcarbondioxideorCO2hasbeenincreasingsteadilyfordecades.Thisisthoughttobecausedbyanexpandeduseoffossilfuelsandbytopplingoftropicalforests.ScientistshavelinkedtheCO2risetoglobalwarmingaphenomenonknownasthegreenhouseeffect.48Alarmednationsoftheworldnowaredrawingupnewconservationpoliciestoreducefossilfuelburninginhopesofreducinggreenhousegasesintheatmosphere.ButDavidSchimeloftheNationalCenterforAtmosphericResearchaco-authorofthenewstudysaysthatbeforedetermininghowmuchtoreducefossilfuelburningweshouldconsidertheeffectsofnaturalclimatevariationsontheabilityofplantstoabsorbCO2.SchimelsaidsatellitemeasurementsofCO2plantgrowthandtemperatureshowthatnaturalwarmingeventssuchasE1NinoatfirstcausemoreCO2tobereleasedintotheatmosphereprobablyastheresultofaccelerateddecayofdeadplantmatterinthesoil.Butlaterwithintwoyearsthereisanexplosionofgrowthinforestsandgrasslandswhichmeansplantssuckmorecarbondioxideoutoftheatmosphere.WethinkthatthereisadelayedresponseinvegetationandsoiltothewarmingeffectsofsuchphenomenaasE1NinoandthisleadstoincreasedplantgrowthsaidSchimel.49HoweverhesaiditisnotclearwhetherthewarmingbyE1NinocausesanetdecreaseinthebuildupofCO2overthelonghaul.Wedon’treallyknowthatyetsaidSchimel.WhatthestudydoesshowhoweveristhattheriseandfallofCO2intheatmosphereisstronglyinfluencedbynaturalchangesinglobaltemperaturesaidB.H.BraswelloftheUniversityofNewHampshireanotherco-authorofthestudy.Braswellsaidthatinyearswhentheglobalweatheriscoolerthannormalthereisadecreaseinboththedecayofdeadplantsandinnewplantgrowth.ThiscausesaneffectthatistheoppositeofE1Ninowarming:CO2atmospherelevelsfirstdeclineandlaterincrease.50IthinkwehavedemonstratedthattheecosystemhasalotmoretodowithclimatechangethanwaspreviouslybelievedsaidBraswellFocusingontheroleofhumanactivityinclimatechangeisimportantbutmanmadefactorsarenottheonlyfactors./
[A]Convenientpackaging[B]Healthandwellness[C]Skepticalcustomers[D]Enormousmarkets[E]Soaringsales[F]TrendydrinkInthelast40yearsthebottledwaterindustryhasgonefromabusinessprospectthatfewtookseriouslytoaglobalindustryworthbillionsofpounds.Thecommodityitselfremainssimple.Thewaywethinkaboutithaschangedfundamentally.Waterisnaturalpureandsourcedatminimalcost.Itsrealvalueliesinitsmarketingandbranding.IthinkbottledwateristhemostrevealingsubstanceforshowingushowtheglobalcapitalistmarketworkstodaysaysRichardWilkprofessorofanthropologyatIndianaUniversity.Inasensewe’rebuyingchoicewe’rebuyingfreedom.That’stheonlythingthatcanexplainwhyyouwouldpaymoneyforabottleofsomethingthatyoucanotherwisegetforfree.41.______Throughaconfectionofadvertisingandmarketingbottledwaterhasbecomeoneofthebiggestsuccessstoriesinthemodernfoodandbeverageindustry.ThedemandforbottlewaterhasgrownexponentiallyinthelastfewdecadessaysDr.PeterGleickauthorofBottledandSold.It’sdoubledit’sdoubledagainandit’sdoubledagain.Andthebottlewatercompaniesseeenormousmarketsnotjustintherichcountriesbutalsointhepoorercountries.NoactualvarietySomepeoplethinkthatbottledwateristhehighpointofglobalcapitalismparticularlythepeopleinthebottledwaterbusiness.Ithinkbottledwateractuallyrepresentsakindofcaricatureoftheglobaleconomy.Itprovidespeopleinthedevelopedworldwith20or30varietiesofsomethingforwhichthereisnoactualvarietysaysCharlesFishmanauthorofTheBigThirst.42.______.Atthebeginningtherereallywasnovarietyandthebottledwaterphenomenonbeganwithonebrand.Perrier佩绿雅矿泉水品牌wasatriumphofadvertisingcreatingabrandthatwastodefineageneration.AttheheartofthecampaigntomakethebrandpopularwasRichardWheatleyoftheLeoBurnettadvertisingagencybetween1979and1994.Perrierpopularisedbottledwaterhesays.Itmadeitacceptablemorethanacceptableitmadeit...desirable.Butitwasnotaninstantsuccess.WhenPerrierUKwaslookingtoincreaseitssalesintheearly1970’sitfacedaskepticalpublic.Manyquestionedwhyanyonewouldbuywaterwhenyoucouldgetitfreefromthetap.43.______.FacedwithobstaclesPerrierturnedtoadvertisingwithacampaignthatwastochangeourconsumerlandscapeforever.Thecampaignwasamarketingcoupandsaleswentthroughtherooffrom12millionbottlesin1980to152millionbytheendofthedecade.Perrierwasnolongerjustabottleofwater.Themarketingandadvertisingteamshadestablishedacrucialemotionallinkbetweentheproductandtheconsumers.PerrierbecameabadgesaysMichaelBellaschairmanoftheBeverageMarketingCorporation.WhenyouheldaPerrierbottleupitsaidsomethingaboutyourselfitsaidyouweresophisticatedyouunderstoodwhatwashappeningintheworld.Itwasaperfectbeveragefortheyoungandcomingbusinessexecutivesthetrend-setters.44.______.Inanageofinstantgratificationstillwaterinportablebottlesprovidedwhatpeopleneededexactlywhentheyneededit.PeopleingeneralaremoreandmoretimepressedsaysMr.Fishman.Wedon’tcookourownmealsanymoreweeatpreparedfoodsofallkinds.Andthere’snothingmoreappealingthanabottleofcoldwateratamomentwhenyou’rereallythirsty.ButIthinkbottledwaterisoneofthoseproductsthatonmanyoccasionswhenpeoplebuyitwhatthey’rebuyingisn’tthewatersomuchasthebottle.Thatisthepackageandtheconvenienceatthatmoment.45.______.WhenpeopleboughtthisconveniencewhattheywerereallybuyingwasPolyethyleneTerephthalateorPETthesinglemostimportantinnovationintheindustry’shistory.StrongshatterproofandahighlyvaluedformofpolyesterPETisaby-productoftheoilindustry.Itisnowutilisedinthepackagingofeverythingfrompharmaceuticalsandsoaptoreadymeals.InyearstocometheenvironmentalimpactofPETwouldhaunttheindustryandraisequestionsaboutitsverysurvivalbutinthe1990sthiswasarevolution.AccordingtoMr.Bellasitwasbehindthesubsequentincrediblegrowthoftheindustry.StartingwiththeintroductionofthesmallpremiumPETwatersthecategorystartedtoexplodesaysMr.Bellas.ThebottledwaterindustrybeforePETonthelistofallbeveragecategorieswasnumberseven.WiththeadventofPETwaterjumpedtothenumbertwospotbehindcarbonatedsoftdrinks.Bybrandingandmarketingwaterbottledwaterhasbeentransformedfromsomethingthatmanyofustookforgrantedintoaproductthatnowmakesbillionsforglobalmultinationalcompanies.
存储管理方案中可采用覆盖技术
Directions: Studythefollowingchartscarefullyandwriteanarticle.Inyourarticleyoushouldcoverthefollowingpoints: 1describethephenomenon; 2analyzethephenomenonandgiveyourcommentonit. Youshouldwriteabout160-200wordsneatlyonANSWERSHEET2.
以下存储管理方案中不采用动态重定位的是
碎片的长度
不是页面调度用算法
在固定分区存储管理中可以采用______的方式把作业装入所分配到的分区中去
46Theclimaticphenomenonthatisbeingblamedforfloodshurricanesandearlysnowstormsalsodeservescreditforencouragingplantgrowthandhelpingtocontrolthepollutantlinkedtoglobalwarminganewstudyshows.E1Nino—theperiodicwarmingofeasternPacificOceanwaters—causesaburstofplantgrowththroughouttheworldandthisremovescarbondioxidefromtheatmosphereresearchershavefound.47ThenewstudyshowsthatnaturalweathereventssuchasthebriefwarmingcausedbyE1Ninohaveamuchmoredramaticeffectthanpreviouslybelievedonhowmuchcarbondioxideisabsorbedbyplantsandhowmuchofthegasisexpelledbythesoil.AtmosphericcarbondioxideorCO2hasbeenincreasingsteadilyfordecades.Thisisthoughttobecausedbyanexpandeduseoffossilfuelsandbytopplingoftropicalforests.ScientistshavelinkedtheCO2risetoglobalwarmingaphenomenonknownasthegreenhouseeffect.48Alarmednationsoftheworldnowaredrawingupnewconservationpoliciestoreducefossilfuelburninginhopesofreducinggreenhousegasesintheatmosphere.ButDavidSchimeloftheNationalCenterforAtmosphericResearchaco-authorofthenewstudysaysthatbeforedetermininghowmuchtoreducefossilfuelburningweshouldconsidertheeffectsofnaturalclimatevariationsontheabilityofplantstoabsorbCO2.SchimelsaidsatellitemeasurementsofCO2plantgrowthandtemperatureshowthatnaturalwarmingeventssuchasE1NinoatfirstcausemoreCO2tobereleasedintotheatmosphereprobablyastheresultofaccelerateddecayofdeadplantmatterinthesoil.Butlaterwithintwoyearsthereisanexplosionofgrowthinforestsandgrasslandswhichmeansplantssuckmorecarbondioxideoutoftheatmosphere.WethinkthatthereisadelayedresponseinvegetationandsoiltothewarmingeffectsofsuchphenomenaasE1NinoandthisleadstoincreasedplantgrowthsaidSchimel.49HoweverhesaiditisnotclearwhetherthewarmingbyE1NinocausesanetdecreaseinthebuildupofCO2overthelonghaul.Wedon’treallyknowthatyetsaidSchimel.WhatthestudydoesshowhoweveristhattheriseandfallofCO2intheatmosphereisstronglyinfluencedbynaturalchangesinglobaltemperaturesaidB.H.BraswelloftheUniversityofNewHampshireanotherco-authorofthestudy.Braswellsaidthatinyearswhentheglobalweatheriscoolerthannormalthereisadecreaseinboththedecayofdeadplantsandinnewplantgrowth.ThiscausesaneffectthatistheoppositeofE1Ninowarming:CO2atmospherelevelsfirstdeclineandlaterincrease.50IthinkwehavedemonstratedthattheecosystemhasalotmoretodowithclimatechangethanwaspreviouslybelievedsaidBraswellFocusingontheroleofhumanactivityinclimatechangeisimportantbutmanmadefactorsarenottheonlyfactors./
分配主存空间时根据由位示图构成的主存分配表
Aconventionalteacher’slicenseeusuallyrequiresauniversitydegreeineducationplusanunpaidtermofpracticeteaching.Thishasnevermademuchsense.Itexcludesbrightstudentswhotakedegreesinothersubjectsandmightteachthosesubjects;itiscostlyandtime-consumingforcareer-switcherswhomustwaitayearormorebeforetheycanenteraclassroom;itissorigidthatprivate-schoolteachersoruniversityprofessorswithyearsofexperiencehavetojumpthroughhoopsbeforetheycanstartteachinginastateschool.Andthereisvirtuallynoevidencethatitcreatesbetterteachers.Forallthatitisstronglybackedbyschoolsofeducationwhichhaveamonopolyofteacher-trainingandbyteachers’unionswhosemembersmakemoremoneywhenitisartificiallyhardforotherstogetintotheprofession. Nowsome45statesandtheDistrictsofColumbiaofferan"alternativeroute"toateacher’slicenseeupfromonlyahandfulinthe1980s.AlternativecertificationACgenerallyallowsindividualswithauniversitydegreetobeginteachingimmediatelyafterpassinganentranceexamination.Theserecruitswatchedoverbyamentorteachthesubjecttheystudiedatuniversityandtakeeducationcoursesatasponsoringuniversitywhiledrawingtheirsalaries. ThetraditionalsortofAmericanteacherislikelytobeyoungwhiteandfemale.Alternativecertificationattractsmoremenandmorenon-whites.InTexasforinstanceroughly90%ofpublic-schoolteachersarewhitebut40%ofthosewhohavejoinedthroughalternativecertificationarenon-whites.TheACroutealsodrawsteacherswillingtogowheretheyaremostneeded.AsurveyofTroopstoTeachersaprogramthatturnsexsoldiersintopublic-schoolteachers"Proudtoserveagain"foundthat39%ofthosetakingpartarewillingtoteachininner-cityschoolsand68%inruralareas. AretheygoodteachersOfficialdomisreluctanttoreleasethedetailswhichmightanswerthatquestionforcertain.Butanecdotalevidencesuggeststheydowell.InNewJerseywhichhasbeenrunningthissortofprogramsince1984richdistrictswhichcanaffordtobechoosyconsistentlyhiremoreACteachersthanpoordistrictsdo.InHoustonTexaswheretheTeachofAmericaprogramTFAputsrecentuniversitygraduatesintopoorcommunitiesasteachersthemosteffectiveteachersaregenerallytheTFAones."Schoolprincipalsareourbiggestfans"WendyKoppTFA’spresidentsaysproudly. Sowhynotscrapthecumbersometeacher-licensinglawsFrederickHessaprofessorattheUniversityofVirginiahaswrittenapaperfortheProgressivePolicyInstitutearguingthatteacher-licensingoughttobestrippedtothebareessentials.Prospectiveteachersshouldberequiredonlytoholdacollegedegreepassatestofessentialskillsandbecheckedtomakesuretheydonothaveacriminalbackground.OthertrainingisimportantarguesMr.Hessbutthemarketnotstatelegislatorsshoulddecidewhatthattraininglookslike.Thisnotionof"competitivecertification"hasdrawnfavorableattentionfromtheBushadministration. WhatdoestheauthorsuggestwhenhecallsforcompetitivecertificationLine7—8Para.5
LRU算法淘汰的是最近最不常用的页
解释页式存储管理中为什么要设置页表和快表
虚拟存储器的容量由计算机的______和______的容量决定与实际______的容量无关
用户程序中出错处理部分不必常驻内存
存储管理方式提供二维地址结构
采用虚拟存储器的前提是程序的两个特点一是程序执行时某些部分是互斥的二是程序的执行往往具有
Aconventionalteacher’slicenseeusuallyrequiresauniversitydegreeineducationplusanunpaidtermofpracticeteaching.Thishasnevermademuchsense.Itexcludesbrightstudentswhotakedegreesinothersubjectsandmightteachthosesubjects;itiscostlyandtime-consumingforcareer-switcherswhomustwaitayearormorebeforetheycanenteraclassroom;itissorigidthatprivate-schoolteachersoruniversityprofessorswithyearsofexperiencehavetojumpthroughhoopsbeforetheycanstartteachinginastateschool.Andthereisvirtuallynoevidencethatitcreatesbetterteachers.Forallthatitisstronglybackedbyschoolsofeducationwhichhaveamonopolyofteacher-trainingandbyteachers’unionswhosemembersmakemoremoneywhenitisartificiallyhardforotherstogetintotheprofession. Nowsome45statesandtheDistrictsofColumbiaofferan"alternativeroute"toateacher’slicenseeupfromonlyahandfulinthe1980s.AlternativecertificationACgenerallyallowsindividualswithauniversitydegreetobeginteachingimmediatelyafterpassinganentranceexamination.Theserecruitswatchedoverbyamentorteachthesubjecttheystudiedatuniversityandtakeeducationcoursesatasponsoringuniversitywhiledrawingtheirsalaries. ThetraditionalsortofAmericanteacherislikelytobeyoungwhiteandfemale.Alternativecertificationattractsmoremenandmorenon-whites.InTexasforinstanceroughly90%ofpublic-schoolteachersarewhitebut40%ofthosewhohavejoinedthroughalternativecertificationarenon-whites.TheACroutealsodrawsteacherswillingtogowheretheyaremostneeded.AsurveyofTroopstoTeachersaprogramthatturnsexsoldiersintopublic-schoolteachers"Proudtoserveagain"foundthat39%ofthosetakingpartarewillingtoteachininner-cityschoolsand68%inruralareas. AretheygoodteachersOfficialdomisreluctanttoreleasethedetailswhichmightanswerthatquestionforcertain.Butanecdotalevidencesuggeststheydowell.InNewJerseywhichhasbeenrunningthissortofprogramsince1984richdistrictswhichcanaffordtobechoosyconsistentlyhiremoreACteachersthanpoordistrictsdo.InHoustonTexaswheretheTeachofAmericaprogramTFAputsrecentuniversitygraduatesintopoorcommunitiesasteachersthemosteffectiveteachersaregenerallytheTFAones."Schoolprincipalsareourbiggestfans"WendyKoppTFA’spresidentsaysproudly. Sowhynotscrapthecumbersometeacher-licensinglawsFrederickHessaprofessorattheUniversityofVirginiahaswrittenapaperfortheProgressivePolicyInstitutearguingthatteacher-licensingoughttobestrippedtothebareessentials.Prospectiveteachersshouldberequiredonlytoholdacollegedegreepassatestofessentialskillsandbecheckedtomakesuretheydonothaveacriminalbackground.OthertrainingisimportantarguesMr.Hessbutthemarketnotstatelegislatorsshoulddecidewhatthattraininglookslike.Thisnotionof"competitivecertification"hasdrawnfavorableattentionfromtheBushadministration. WhathaschangedsincetheintroductionofAC
如果处理器有32位地址则它的虚拟地址空间为字节
可变分区存储管理时所采用的地址转换公式为
在一个请求分页系统中假如一个作业的页面走向为432143543215当分配给该作业的物理块数M分别是3和4时分别采用LRU和FIFO页面替换算法计算访问过程中所发生的缺页次数和缺页率比较所得结果
[A]Convenientpackaging[B]Healthandwellness[C]Skepticalcustomers[D]Enormousmarkets[E]Soaringsales[F]TrendydrinkInthelast40yearsthebottledwaterindustryhasgonefromabusinessprospectthatfewtookseriouslytoaglobalindustryworthbillionsofpounds.Thecommodityitselfremainssimple.Thewaywethinkaboutithaschangedfundamentally.Waterisnaturalpureandsourcedatminimalcost.Itsrealvalueliesinitsmarketingandbranding.IthinkbottledwateristhemostrevealingsubstanceforshowingushowtheglobalcapitalistmarketworkstodaysaysRichardWilkprofessorofanthropologyatIndianaUniversity.Inasensewe’rebuyingchoicewe’rebuyingfreedom.That’stheonlythingthatcanexplainwhyyouwouldpaymoneyforabottleofsomethingthatyoucanotherwisegetforfree.41.______Throughaconfectionofadvertisingandmarketingbottledwaterhasbecomeoneofthebiggestsuccessstoriesinthemodernfoodandbeverageindustry.ThedemandforbottlewaterhasgrownexponentiallyinthelastfewdecadessaysDr.PeterGleickauthorofBottledandSold.It’sdoubledit’sdoubledagainandit’sdoubledagain.Andthebottlewatercompaniesseeenormousmarketsnotjustintherichcountriesbutalsointhepoorercountries.NoactualvarietySomepeoplethinkthatbottledwateristhehighpointofglobalcapitalismparticularlythepeopleinthebottledwaterbusiness.Ithinkbottledwateractuallyrepresentsakindofcaricatureoftheglobaleconomy.Itprovidespeopleinthedevelopedworldwith20or30varietiesofsomethingforwhichthereisnoactualvarietysaysCharlesFishmanauthorofTheBigThirst.42.______.Atthebeginningtherereallywasnovarietyandthebottledwaterphenomenonbeganwithonebrand.Perrier佩绿雅矿泉水品牌wasatriumphofadvertisingcreatingabrandthatwastodefineageneration.AttheheartofthecampaigntomakethebrandpopularwasRichardWheatleyoftheLeoBurnettadvertisingagencybetween1979and1994.Perrierpopularisedbottledwaterhesays.Itmadeitacceptablemorethanacceptableitmadeit...desirable.Butitwasnotaninstantsuccess.WhenPerrierUKwaslookingtoincreaseitssalesintheearly1970’sitfacedaskepticalpublic.Manyquestionedwhyanyonewouldbuywaterwhenyoucouldgetitfreefromthetap.43.______.FacedwithobstaclesPerrierturnedtoadvertisingwithacampaignthatwastochangeourconsumerlandscapeforever.Thecampaignwasamarketingcoupandsaleswentthroughtherooffrom12millionbottlesin1980to152millionbytheendofthedecade.Perrierwasnolongerjustabottleofwater.Themarketingandadvertisingteamshadestablishedacrucialemotionallinkbetweentheproductandtheconsumers.PerrierbecameabadgesaysMichaelBellaschairmanoftheBeverageMarketingCorporation.WhenyouheldaPerrierbottleupitsaidsomethingaboutyourselfitsaidyouweresophisticatedyouunderstoodwhatwashappeningintheworld.Itwasaperfectbeveragefortheyoungandcomingbusinessexecutivesthetrend-setters.44.______.Inanageofinstantgratificationstillwaterinportablebottlesprovidedwhatpeopleneededexactlywhentheyneededit.PeopleingeneralaremoreandmoretimepressedsaysMr.Fishman.Wedon’tcookourownmealsanymoreweeatpreparedfoodsofallkinds.Andthere’snothingmoreappealingthanabottleofcoldwateratamomentwhenyou’rereallythirsty.ButIthinkbottledwaterisoneofthoseproductsthatonmanyoccasionswhenpeoplebuyitwhatthey’rebuyingisn’tthewatersomuchasthebottle.Thatisthepackageandtheconvenienceatthatmoment.45.______.WhenpeopleboughtthisconveniencewhattheywerereallybuyingwasPolyethyleneTerephthalateorPETthesinglemostimportantinnovationintheindustry’shistory.StrongshatterproofandahighlyvaluedformofpolyesterPETisaby-productoftheoilindustry.Itisnowutilisedinthepackagingofeverythingfrompharmaceuticalsandsoaptoreadymeals.InyearstocometheenvironmentalimpactofPETwouldhaunttheindustryandraisequestionsaboutitsverysurvivalbutinthe1990sthiswasarevolution.AccordingtoMr.Bellasitwasbehindthesubsequentincrediblegrowthoftheindustry.StartingwiththeintroductionofthesmallpremiumPETwatersthecategorystartedtoexplodesaysMr.Bellas.ThebottledwaterindustrybeforePETonthelistofallbeveragecategorieswasnumberseven.WiththeadventofPETwaterjumpedtothenumbertwospotbehindcarbonatedsoftdrinks.Bybrandingandmarketingwaterbottledwaterhasbeentransformedfromsomethingthatmanyofustookforgrantedintoaproductthatnowmakesbillionsforglobalmultinationalcompanies.
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