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中国__的成立使中国革命的面貌从此焕然一新，“新”是指( )。
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中国__的诞生是中国历史上开天辟地的大事自从有了中国__中国革命的面貌就焕然一新了今年是中国共产
90周年
92周年
95周年
97周年
自从有了中国__中国革命的面貌从此焕然一新中国__诞生的地点是
北京
长沙
广州
上海
中国__成立的思想基础和阶级基础分别是什么扼要举出1927年7月肖在工共领导和推动下发生的五件大事
自从有了中国__中国革命的面貌从此焕然一新正确理解这个新是
新的领导核心和指导思想
新的革命道路
新的革命前途
新的革命方法
1921年中国__的成立是中国革命历史上划时代的里程碑中国革命从此焕然一新从此中国革命有了
正确的革命道路
科学的指导思想
坚强的领导力量
崭新的奋斗目标
__说自从有了中国__中国革命的面貌就焕然一新了其中新主要是指①中国革命有了全国统一的无产
①②③④
①②③
②③④
①③④
中国__的成立是中国历史上开天辟地的大事变自 从有了中国__中国革命面目就焕然一新了
被称为中国历史上开天辟地的大事变从此中国革命的面貌焕然一新的重要事件是
辛亥革命胜利
五四运动爆发
中国__诞生
中华人民共和国成立
列举旧民主主义革命与新民主主义革命的有关史实比较说明为什么自从有了中国__中国革命的面貌就焕然一新
自从有了中国__中国革命的面貌就焕然一新了
中国__诞生后中国革命面貌就焕然一新了新主要体现在①新的指导思想以马克思主义为指导②新的领导核心—
①②③
②③④
①③④
①②④
中国__成立的伟大意义有
中国无产阶级有了自己的战斗司令部
中国人民的革命事业有了坚强的领导核心
中国革命有了明确的目标和方向
中国革命的面貌从此焕然一新
中国__的成立使中国革命的面貌从此焕然一新新是指
有了新的领导阶级
有了新的指导思想
有了新的革命性质
新的革命前途
中国__成立后中国革命的面貌焕然一新了其中新主要体现在
中国革命开始以马克思主义为指导
中国革命开始了社会主义革命
中国革命在无产阶级政党的领导下进行，
中国革命开始以社会主义、共产主义为远大目标
中国__的成立使中国革命面貌从此焕然一新焕然一新之新在
新的领导阶级
新的指导思想
新的革命性质
新的革命前途
自从有了中国__中国革命的面貌从此焕然一新中国__诞生的地点是
北京
长沙
广州
上海
自从有了中国__中国革命的面貌就焕然一新了主要新在
革命任务
革命手段
革命性质
革命前途
中国__的成立①改变了中国革命的性质②使中国革命的面貌焕然一新③提出了彻底的反帝反封建纲领④使中国
①④
①②
②③④
①②③
中国__的诞生后中国革命面貌焕然一新主要新在①斗争手段②领导力量③指导思想④革命前途
①②③
①②④
①②③④
②③④
.中共一大宣告了中国__的诞生使中国的革命面貌焕然一新从此无产阶级登上政治舞台
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Euthanasiaisclearlyadeliberateandintentionalaspectofakilling.Takingahumanlifeevenwithsubtleritesandconsentofthepartyinvolvedisbarbaric.Noonecanjustlykillanotherhumanbeing.Justasitiswrongforaserialkillertomurderitiswrongforaphysiciantodosoaswellnomatterwhatthemotivefordoingsomaybe.ManythinkersincludingalmostallorthodoxCatholicsbelievethateuthanasiaisimmoral.Theyopposekillingpatientsinanycircumstanceswhatever.Howevertheythinkitisallrightinsomespecialcircumstancestoallowpatientstodiebywithholdingtreatment.TheAmericanMedicalAssociation’spolicystatementonmercykillingsupportsthistraditionalview.InmypaperActiveandPassiveEuthanasiaIargueagainstthetraditionalviewthatthereisinfactnonormaldifferencebetweenkillingandlettingdie--ifoneispermissiblethensoistheother.ProfessorSullivandoesnotdisputemyargument;insteadhedismissesitasirrelevant.Thetraditionaldoctrinehesaysdoesnotappealtoordependonthedistinctionbetweenkillingandlettingdie.Thereforeargumentsagainstthatdistinctionleavethetraditionalpositionuntouched.IsmyargumentreallyirrelevantIdon’tseehowitcanbe.AsSullivanhimselfpointsoutnearlyeveryoneholdsthatitissometimesmeaninglesstoprolongtheprocessofdyingandthatinthosecasesitismorallypermissibletoletapatientdieeventhoughafewmorehoursordayscouldbesavedbyproceduresthatwouldalsoincreasetheagoniesofthedying.Butifitisimpossibletodefendageneraldistinctionbetweenlettingpeopledieandactingtoterminatetheirlivesdirectlythenitwouldseemthatactiveeuthanasiaalsomaybemorallypermissible.ButtraditionalistslikeprofessorSullivanholdthatactiveeuthanasia--thedirectkillingofpatients--isnotmorallypermissible;soifmyargumentissoundtheirviewmustbemistaken.Icannotagreethenthatmyargumentleavethetraditionalpositionuntouched.HoweverIshallnotpressthispoint.InsteadIshallpresentsomefurtherargumentsagainstthetraditionalpositionconcentratingonthoseelementsofthepositionwhichprofessorSullivanhimselfthinksmostimportant.Accordingtohimwhatisimportantisfirstthatweshouldneverintentionallyterminatethelifeofapatienteitherbyactionoromissionandsecondthatwemayceaseoromittreatmentofapatientknowingthatthiswillresultindeathonlyifthemeansoftreatmentinvolvedareextraordinary.Theauthor’spurposeinwritingthispassageis
Asoneworkswithcolorinapracticalorexperimentalwayoneisimpressedbytwoapparentlyunrelatedfacts.Colorasseenisamobilechangeablething1toalargeextentontherelationshipofthecolor2othercolors3simultaneously.Itisnot4initsrelationtothedirectstimuluswhich5it.Ontheotherhandthepropertiesofsurfacesthatgive6tocolordonotseemtochangegreatlyunderawidevarietyofilluminationcolorusuallybutnotalwayslookingmuchthesameinartificiallightasindaylight.Bothoftheseeffectsseemtobe7inlargeparttothemechanismofcolor8. Whentheeyeis9toacoloredareathereisanimmediatereadjustmentofthe10oftheeyetocolorinandaroundthearea11.Thisreadjustmentdoesnotpromptlyaffectthecolorseenbutusuallydoesaffectthenextareatowhichthe12isshifted.Thelongerthetimeofviewingthehigherthe13andthelargertheareathegreatertheeffectwillbe14itspersistenceinthe15viewingsituation.AsindicatedbytheworkofWrightandSchoutenitappearsthatat16forafirstapproximationfulladaptationtakesplaceover17timeiftheadaptingsourceismoderatelybrightandtheeyehasbeenin18darknessjustpreviously.Also19ofthepersistenceoftheeffectiftheeyeisshiftedaroundfromoneobjecttoanotherallofwhichareatsimilarbrightnessorhavesimilarcolorstheadaptationwilltendtobecome20overthewholeeye. SectionⅠUseofEnglishDirections:Readthefollowingtext.ChoosethebestwordsforeachnumberedblankandmarkABCandDonANSWERSHEET1.20
Asoneworkswithcolorinapracticalorexperimentalwayoneisimpressedbytwoapparentlyunrelatedfacts.Colorasseenisamobilechangeablething1toalargeextentontherelationshipofthecolor2othercolors3simultaneously.Itisnot4initsrelationtothedirectstimuluswhich5it.Ontheotherhandthepropertiesofsurfacesthatgive6tocolordonotseemtochangegreatlyunderawidevarietyofilluminationcolorusuallybutnotalwayslookingmuchthesameinartificiallightasindaylight.Bothoftheseeffectsseemtobe7inlargeparttothemechanismofcolor8. Whentheeyeis9toacoloredareathereisanimmediatereadjustmentofthe10oftheeyetocolorinandaroundthearea11.Thisreadjustmentdoesnotpromptlyaffectthecolorseenbutusuallydoesaffectthenextareatowhichthe12isshifted.Thelongerthetimeofviewingthehigherthe13andthelargertheareathegreatertheeffectwillbe14itspersistenceinthe15viewingsituation.AsindicatedbytheworkofWrightandSchoutenitappearsthatat16forafirstapproximationfulladaptationtakesplaceover17timeiftheadaptingsourceismoderatelybrightandtheeyehasbeenin18darknessjustpreviously.Also19ofthepersistenceoftheeffectiftheeyeisshiftedaroundfromoneobjecttoanotherallofwhichareatsimilarbrightnessorhavesimilarcolorstheadaptationwilltendtobecome20overthewholeeye. Readthefollowingtext.ChoosethebestwordsforeachnumberedblankandmarkABCandDonANSWERSHEET1.2
Asoneworkswithcolorinapracticalorexperimentalwayoneisimpressedbytwoapparentlyunrelatedfacts.Colorasseenisamobilechangeablething1toalargeextentontherelationshipofthecolor2othercolors3simultaneously.Itisnot4initsrelationtothedirectstimuluswhich5it.Ontheotherhandthepropertiesofsurfacesthatgive6tocolordonotseemtochangegreatlyunderawidevarietyofilluminationcolorusuallybutnotalwayslookingmuchthesameinartificiallightasindaylight.Bothoftheseeffectsseemtobe7inlargeparttothemechanismofcolor8. Whentheeyeis9toacoloredareathereisanimmediatereadjustmentofthe10oftheeyetocolorinandaroundthearea11.Thisreadjustmentdoesnotpromptlyaffectthecolorseenbutusuallydoesaffectthenextareatowhichthe12isshifted.Thelongerthetimeofviewingthehigherthe13andthelargertheareathegreatertheeffectwillbe14itspersistenceinthe15viewingsituation.AsindicatedbytheworkofWrightandSchoutenitappearsthatat16forafirstapproximationfulladaptationtakesplaceover17timeiftheadaptingsourceismoderatelybrightandtheeyehasbeenin18darknessjustpreviously.Also19ofthepersistenceoftheeffectiftheeyeisshiftedaroundfromoneobjecttoanotherallofwhichareatsimilarbrightnessorhavesimilarcolorstheadaptationwilltendtobecome20overthewholeeye. Readthefollowingtext.ChoosethebestwordsforeachnumberedblankandmarkABCandDonANSWERSHEET1.4
Asoneworkswithcolorinapracticalorexperimentalwayoneisimpressedbytwoapparentlyunrelatedfacts.Colorasseenisamobilechangeablething1toalargeextentontherelationshipofthecolor2othercolors3simultaneously.Itisnot4initsrelationtothedirectstimuluswhich5it.Ontheotherhandthepropertiesofsurfacesthatgive6tocolordonotseemtochangegreatlyunderawidevarietyofilluminationcolorusuallybutnotalwayslookingmuchthesameinartificiallightasindaylight.Bothoftheseeffectsseemtobe7inlargeparttothemechanismofcolor8. Whentheeyeis9toacoloredareathereisanimmediatereadjustmentofthe10oftheeyetocolorinandaroundthearea11.Thisreadjustmentdoesnotpromptlyaffectthecolorseenbutusuallydoesaffectthenextareatowhichthe12isshifted.Thelongerthetimeofviewingthehigherthe13andthelargertheareathegreatertheeffectwillbe14itspersistenceinthe15viewingsituation.AsindicatedbytheworkofWrightandSchoutenitappearsthatat16forafirstapproximationfulladaptationtakesplaceover17timeiftheadaptingsourceismoderatelybrightandtheeyehasbeenin18darknessjustpreviously.Also19ofthepersistenceoftheeffectiftheeyeisshiftedaroundfromoneobjecttoanotherallofwhichareatsimilarbrightnessorhavesimilarcolorstheadaptationwilltendtobecome20overthewholeeye. Readthefollowingtext.ChoosethebestwordsforeachnumberedblankandmarkABCandDonANSWERSHEET1.10
Inthenextcenturywe’llbeabletoalterourDNAradicallyencodingourvisionsandvanitieswhileconcoctingnewlife-forms.WhenDr.FrankensteinmadehismonsterhewrestledwiththemoralissueofwhetherheshouldallowittoreproduceHadItherightformyownbenefittoinflictthecurseuponeverlastinggenerationsWillsuchquestionsrequireustodevelopnewmoralphilosophiesProbablynot.Insteadwe’llreachagainforatime-testedmoralconceptonesometimescalledtheGoldenRuleandwhichKantthemillennium’smostprudentmoralistconjuredupintoacategoricalimperative:Dountoothersasyouwouldhavethemdountoyou;treateachpersonasanindividualratherthanasameanstosomeend.Underthismoralpreceptweshouldrecoilathumancloningbecauseitinevitablyentailsusinghumansasmeanstootherhumans’endsandvaluingthemascopiesofotherswelovedorascollectionsofbodypartsnotasindividualsintheirownright.WeshouldalsodrawalinehoweverfuzzythatwouldpermitusinggeneticengineeringtocurediseasesanddisabilitiesbutnottochangethepersonalattributesthatmakesomeoneanindividualIQphysicalappearancegenderandsexuality.Thebiotechagewillalsogiveusmorereasontoguardourpersonalprivacy.AldousHuxleyinBraveNewWorldgotitwrong:ratherthancentralizingpowerinthehandsofthestateDNAtechnologyhasempoweredindividualsandfamilies.Butthestatewillhaveanimportantrolemakingsurethatnooneincludinginsurancecompaniescanlookatourgeneticdatawithoutourpermissionoruseittodiscriminateagainstus.Thenwecangetreadyforthebreakthroughsthatcouldcomeattheendofthenextcenturyandthetechnologyiscomparabletomappingourgenes:plottingthe10billionormoreneuronsofourbrain.Withthatinformationwemightsomedaybeabletocreateartificialintelligencesthatthinkandexperienceconsciousnessinwaysthatareindistinguishablefromahumanbrain.Eventuallywemightbeabletoreplicateourownmindsinadry-waremachinesothatwecouldliveonwithoutthewet-wareofabiologicalbrainandbody.The20thcentury’srevolutionininfotechnologywilltherebymergewiththe21stcentury’srevolutioninbiotechnology.Butthisissciencefiction.Let’sturnthepagenowandgetbacktorealscience.Judgedfromtheinformationinthelastparagraphwecanpredictthattheauthorislikelytowritewhichofthefollowinginthenextsection
Whatoursocietysuffersfrommosttodayistheabsenceofconsensusaboutwhatitandlifeinitoughttobe;suchconsensuscannotbegainedfromsociety’spresentstageorfromfantasiesaboutwhatitoughttobe.Forthatthepresentistoocloseandtoodiversifiedandthefuturetoouncertaintomakebelievableclaimsaboutit.AconsensusinthepresenthencecanbeachievedonlythroughasharedunderstandingofthepastasHomer’sepicsinformedthosewholivedcenturieslaterwhatitmeanttobeGreekandbywhatimagesandidealstheyweretolivetheirlivesandorganizetheirsocieties.Mostsocietiesderiveconsensusfromalonghistoryalanguagealltheirownacommonreligioncommonancestry.Themythsbywhichtheylivearebasedonallofthese.ButtheUnitedStatesisacountryofimmigrantscomingfromagreatvarietyofnations.LatelyithasbeenemphasizedthatanasocialnarcissisticpersonalityhasbecomecharacteristicofAmericansandthatitisthistypeofpersonalitythatmakesforthelackofwell-beingbecauseitpreventsusfromachievingconsensusthatwouldcounteractatendencytowithdrawintoprivateworlds.InthisstudyofnarcissismChristopherLashsaysthatmodernmantorturedbyself-consciousnessturnstonewtherapiesnottofreehimselfofhispersonalworriesbuttofindmeaningandpurposeinlifetofindsomethingtolivefor.Thereiswidespreaddistressbecausenationalmoralehasdeclinedandwehavelostanearliersenseofnationalvisionandpurpose.Contrarytorigidreligionsorpoliticalbeliefsasarefoundintotalitariansocietiesourcultureisoneofthegreatindividualdifferencesatleastinprincipleandintheory;butthisleadstodisunityevenchaos.Americansbelieveinthevalueofdiversitybutjustbecauseoursisasocietybasedonindividualdiversityitneedsconsensusaboutsomedominatingideasmorethansocietiesbasedonuniformoriginoftheircitizens.Henceifwearetohaveconsensusitmustbebasedonamyth--avisionaboutacommonexperienceaconquestthatmadeusAmericansasthemythabouttheconquestofTroyformedtheGreeks.Onlyacommonmythcanofferrelieffromthefearthatlifeiswithoutmeaningorpurpose.Mythspermitustoexamineourplaceintheworldbycomparingittoasharedidea.Mythsaresharedfantasiesthatformthetie.thatbindstheindividualtoothermembersofhisgroup.Suchmythshelptowardofffeelingsofisolationsguiltanxietyandpurposelessness--inshorttheycombatisolationandthebreakdownofsocialstandardsandvalues.FromthetextwelearnthatChristopherLashismostprobably
Asoneworkswithcolorinapracticalorexperimentalwayoneisimpressedbytwoapparentlyunrelatedfacts.Colorasseenisamobilechangeablething1toalargeextentontherelationshipofthecolor2othercolors3simultaneously.Itisnot4initsrelationtothedirectstimuluswhich5it.Ontheotherhandthepropertiesofsurfacesthatgive6tocolordonotseemtochangegreatlyunderawidevarietyofilluminationcolorusuallybutnotalwayslookingmuchthesameinartificiallightasindaylight.Bothoftheseeffectsseemtobe7inlargeparttothemechanismofcolor8. Whentheeyeis9toacoloredareathereisanimmediatereadjustmentofthe10oftheeyetocolorinandaroundthearea11.Thisreadjustmentdoesnotpromptlyaffectthecolorseenbutusuallydoesaffectthenextareatowhichthe12isshifted.Thelongerthetimeofviewingthehigherthe13andthelargertheareathegreatertheeffectwillbe14itspersistenceinthe15viewingsituation.AsindicatedbytheworkofWrightandSchoutenitappearsthatat16forafirstapproximationfulladaptationtakesplaceover17timeiftheadaptingsourceismoderatelybrightandtheeyehasbeenin18darknessjustpreviously.Also19ofthepersistenceoftheeffectiftheeyeisshiftedaroundfromoneobjecttoanotherallofwhichareatsimilarbrightnessorhavesimilarcolorstheadaptationwilltendtobecome20overthewholeeye. Readthefollowingtext.ChoosethebestwordsforeachnumberedblankandmarkABCandDonANSWERSHEET1.14
Euthanasiaisclearlyadeliberateandintentionalaspectofakilling.Takingahumanlifeevenwithsubtleritesandconsentofthepartyinvolvedisbarbaric.Noonecanjustlykillanotherhumanbeing.Justasitiswrongforaserialkillertomurderitiswrongforaphysiciantodosoaswellnomatterwhatthemotivefordoingsomaybe.ManythinkersincludingalmostallorthodoxCatholicsbelievethateuthanasiaisimmoral.Theyopposekillingpatientsinanycircumstanceswhatever.Howevertheythinkitisallrightinsomespecialcircumstancestoallowpatientstodiebywithholdingtreatment.TheAmericanMedicalAssociation’spolicystatementonmercykillingsupportsthistraditionalview.InmypaperActiveandPassiveEuthanasiaIargueagainstthetraditionalviewthatthereisinfactnonormaldifferencebetweenkillingandlettingdie--ifoneispermissiblethensoistheother.ProfessorSullivandoesnotdisputemyargument;insteadhedismissesitasirrelevant.Thetraditionaldoctrinehesaysdoesnotappealtoordependonthedistinctionbetweenkillingandlettingdie.Thereforeargumentsagainstthatdistinctionleavethetraditionalpositionuntouched.IsmyargumentreallyirrelevantIdon’tseehowitcanbe.AsSullivanhimselfpointsoutnearlyeveryoneholdsthatitissometimesmeaninglesstoprolongtheprocessofdyingandthatinthosecasesitismorallypermissibletoletapatientdieeventhoughafewmorehoursordayscouldbesavedbyproceduresthatwouldalsoincreasetheagoniesofthedying.Butifitisimpossibletodefendageneraldistinctionbetweenlettingpeopledieandactingtoterminatetheirlivesdirectlythenitwouldseemthatactiveeuthanasiaalsomaybemorallypermissible.ButtraditionalistslikeprofessorSullivanholdthatactiveeuthanasia--thedirectkillingofpatients--isnotmorallypermissible;soifmyargumentissoundtheirviewmustbemistaken.Icannotagreethenthatmyargumentleavethetraditionalpositionuntouched.HoweverIshallnotpressthispoint.InsteadIshallpresentsomefurtherargumentsagainstthetraditionalpositionconcentratingonthoseelementsofthepositionwhichprofessorSullivanhimselfthinksmostimportant.Accordingtohimwhatisimportantisfirstthatweshouldneverintentionallyterminatethelifeofapatienteitherbyactionoromissionandsecondthatwemayceaseoromittreatmentofapatientknowingthatthiswillresultindeathonlyifthemeansoftreatmentinvolvedareextraordinary.Itseemsthatthewriterismostconcernedabout
Asoneworkswithcolorinapracticalorexperimentalwayoneisimpressedbytwoapparentlyunrelatedfacts.Colorasseenisamobilechangeablething1toalargeextentontherelationshipofthecolor2othercolors3simultaneously.Itisnot4initsrelationtothedirectstimuluswhich5it.Ontheotherhandthepropertiesofsurfacesthatgive6tocolordonotseemtochangegreatlyunderawidevarietyofilluminationcolorusuallybutnotalwayslookingmuchthesameinartificiallightasindaylight.Bothoftheseeffectsseemtobe7inlargeparttothemechanismofcolor8. Whentheeyeis9toacoloredareathereisanimmediatereadjustmentofthe10oftheeyetocolorinandaroundthearea11.Thisreadjustmentdoesnotpromptlyaffectthecolorseenbutusuallydoesaffectthenextareatowhichthe12isshifted.Thelongerthetimeofviewingthehigherthe13andthelargertheareathegreatertheeffectwillbe14itspersistenceinthe15viewingsituation.AsindicatedbytheworkofWrightandSchoutenitappearsthatat16forafirstapproximationfulladaptationtakesplaceover17timeiftheadaptingsourceismoderatelybrightandtheeyehasbeenin18darknessjustpreviously.Also19ofthepersistenceoftheeffectiftheeyeisshiftedaroundfromoneobjecttoanotherallofwhichareatsimilarbrightnessorhavesimilarcolorstheadaptationwilltendtobecome20overthewholeeye. Readthefollowingtext.ChoosethebestwordsforeachnumberedblankandmarkABCandDonANSWERSHEET1.6
Asoneworkswithcolorinapracticalorexperimentalwayoneisimpressedbytwoapparentlyunrelatedfacts.Colorasseenisamobilechangeablething1toalargeextentontherelationshipofthecolor2othercolors3simultaneously.Itisnot4initsrelationtothedirectstimuluswhich5it.Ontheotherhandthepropertiesofsurfacesthatgive6tocolordonotseemtochangegreatlyunderawidevarietyofilluminationcolorusuallybutnotalwayslookingmuchthesameinartificiallightasindaylight.Bothoftheseeffectsseemtobe7inlargeparttothemechanismofcolor8. Whentheeyeis9toacoloredareathereisanimmediatereadjustmentofthe10oftheeyetocolorinandaroundthearea11.Thisreadjustmentdoesnotpromptlyaffectthecolorseenbutusuallydoesaffectthenextareatowhichthe12isshifted.Thelongerthetimeofviewingthehigherthe13andthelargertheareathegreatertheeffectwillbe14itspersistenceinthe15viewingsituation.AsindicatedbytheworkofWrightandSchoutenitappearsthatat16forafirstapproximationfulladaptationtakesplaceover17timeiftheadaptingsourceismoderatelybrightandtheeyehasbeenin18darknessjustpreviously.Also19ofthepersistenceoftheeffectiftheeyeisshiftedaroundfromoneobjecttoanotherallofwhichareatsimilarbrightnessorhavesimilarcolorstheadaptationwilltendtobecome20overthewholeeye. Readthefollowingtext.ChoosethebestwordsforeachnumberedblankandmarkABCandDonANSWERSHEET1.8
Whenadiseaseofepidemicproportionsripsintothepopulacescientistsimmediatelygettoworktryingtolocatethesourceoftheafflictionandfindwaystocombatit.Oftentimessuccessisachievedasmedicalscienceisabletoisolatetheparasitegermorcellthatcausestheproblemandfindswaystoeffectivelykillorcontainit.Inthemostseriousofcasesinwhichtheentirepopulationofaregionorcountrymaybeatgraveriskitisdeemednecessarytoprotecttheentirepopulationthroughvaccinationsoastosafeguardlivesandensurethatthediseasewillnotspread.Theprocessofvaccinationallowsthepatient’sbodytodevelopimmunitytothevirusordiseasesothatifitisencounteredonecanwarditoffnaturally.Toaccomplishthisasmallweakordeadstrainofthediseaseisactuallyinjectedintothepatientinacontrolledenvironmentsothathisbody’simmunesystemcanlearntofighttheinvaderproperly.Informationonhowtopenetratethedisease’sdefensesistransmittedtoallelementsofthepatient’simmunesysteminaprocessthatoccursnaturallyinwhichgeneticinformationispassedfromcelltocell.Thismakessurethatshouldthepatientlatercomeintocontactwiththerealproblemhisbodyiswellequippedandtrainedtodealwithithavingalreadydonesobefore.Therearedangersinherentintheprocesshowever.Onoccasioneventheweakenedversionofthediseasecontainedinthevaccineprovestoomuchforthebodytohandleresultingintheimmunesystemsuccumbingandthereforethepatient’sdeath.SuchisthecaseofthesmallpoxvaccinedesignedtoeradicatethesmallpoxepidemicthatnearlywipedouttheentireNativeAmericanpopulationandkilledmassivenumbersofsettlers.Approximately1in10000peoplewhoreceivesthevaccinecontractthesmallpoxdiseasefromthevaccineitselfanddiesfromit.ThusiftheentirepopulationoftheUnitedStatesweretoreceivetheSmallpoxVaccinetoday3000Americanswouldbeleftdead.Fortunatelythesmallpoxviruswasconsiderederadicatedintheearly1970’sendingthemandatoryvaccinationofallbabiesinAmerica.Intheeventofareintroductionofthediseasehowevermandatoryvaccinationsmayresumeresultinginmoreunexpecteddeathsfromvaccination.Theprocesswhichistrulyamixedblessingmayindeedhidesomehiddencurses.Whichofthefollowingistrueaccordingtothetext
[A]Extensiveapplicationsofhaptictechnology. [B]Possibilitiesrenderedbyhapticmechanisms. [C]Thefeasibilityofextendingoursensesandexploringabstractuniverses. [D]Anexampleoftheprogressinscienceofhaptics. [E]Bringingthepotentialofoursensesintofullplay. [F]Willhapticsstepintoabrightfuture "OOOF!"Usingyourmouseyouheaveadatafileacrossthescreen--acoupleofgigabytesofdataweighalot.Itsroughsurfacetellsyouthatitisagraphicsfile.Havingtippedthishugepileofdataintoahopperthatsendsittotherightprogramyouexamineascreenimageoftheforesttrailyou’llbehikingonyourvacation.Thenusingaglovedhandyoumasteritsdetailsbyrunningyourfingersoveritsforksandbendsitssharprisesandfalls.LateryousendanE-mailtoyourbelovedbendingtothedeskpadtoattachakiss. 41.__________. ThescienceofhapticsfromtheGreekhaptesthai"totouch"ismakingthesefantasiesreal.Afewprimitivedevicesareextendinghuman-machinecommunicationbeyondvisionandsound.Hapticjoysticksandsteeringwheelsforcomputergamesarealreadygivinghappyplayerssomeofthesensationsofpilotingaspaceshipdrivingaracingcarorfiringweapons.Intimehapticinterfacesmayallowustomanipulatesinglemoleculesfeelcloudsandgalaxiesevenreachintohigherdimensionstograspthesubtlestructuresofmathematics. 42.__________. Mostofoursensestirepassive.Inhearingandvisionforexamplethesoundorlightissimplyreceivedandanalyzed.Buttouchisdifferent:weactivelyexploreandalterrealitywithourhandssothesameactionthatgathersinformationcanalsochangetheworld--tomodelapieceofclayorpressabuttonforexample.Inprovidingdirectcontactbetweenpeopletouchcarriesemotionalimpact.Andinprovidingdirectcontactwiththeworlditisthesuresignofrealityasin"pinchme--amIdreaming" 43.__________. Somesmallstepshaveevenbeentakentowardswhole-bodyhaptics.TouchTechnologyofNovaScotiaCanadahasbuiltahapticchair.Itlookslikeafull-lengthloungechairinafamilydenbutitssurfaceisstuddedwith72"tactors"-pneumaticpistonrodscoveredwithroundedbuttonsthatcanextendaboutaninchandcanbedrivenundercomputercontrolinanydesiredsequenceandpattern.Itcouldbeprogrammedtoimitatearealmassageortofunctionintimetomusic.Accordingtothemanufacturerthatprovidesapowerfulblendingofsen-sations--along-termgoalofvirtualreality. 44.__________. Evenatitspresentcrudelevelhoweverhapticscanmaketangiblewhatoncecouldnotbetouchedorevenpictured.ToinvestigatetheworldoftheverysmallresearchersattheUniversityofNorthCarolinaChapelHillhavedevelopedthenanoManipulator.Thisaddstouchtothetechniqueofscanningprobemicroscopywhichcanimageasingleatombymonitoringeithertheelectricalcurrentflowingbetweenanextremelyfineprobeandasurfaceortheforcebetweenthem.WiththenanoManipulatorresearcherscanseeandmanipulateauniverseamilliontimessmallerthantheirowntostudyvirusesandtinysemiconductingdevices.Iftheforcefeedbackcanbemadesensitiveenoughitmaybepossibletopushmolecularkeysintospecificmolecularlockstocustom-designdrugsorassemblesiliconpartsintointricatenanomachines.Withotherinterfacesthereisnoreasonweshouldn’talsobeabletotouchtheverylarge-cloudsoceancurrentsmantleflowsmountainsgalaxyclusters.Ortheverystrong--withasuitableforcescalingnewceramicsoralloyscouldbesqueezedandtwangedtotesttheirengineeringproperties.Orthephysicallyextremeandinaccessible--suchasultrahotplasmaflowsinfusionmachines. 45.__________. Haptictechnologycouldevenmakeabstractideastangible.Manyscientificconceptsoccupyspacesofmorethanthreedimensionsstringtheoryfor’exampleassertsthatweliveina10or11-dimensionalUniverse.Asitisimpossibletovisualisesuchaspaceweexploretheseideas’throughmathematicalexpressionsortwodimensionalsketchesonpaper.Butprobingtheseunfamiliargeometrieswithtouchmaybemoreeffective.Andforblindpeoplehapticsoffersanewwaytograspinformationeveninthreedimensions.AgroupattheUniversityofDelawarehasdevelopedanenvironmentwhereapersoncanfeelamathematicalfunction.UsingaPHAN-TOMtheuser"walks"alongthesurfaceofthefigure.Likeahikerfollowingmountainousterraintheuserfeelswherethefunctionissteepwhereitislevelandwhereitspeaksandvalleyslie.OtherhapticsystemscouldhelpblindpeopletobrowsetheInternetfeelingimagesaswellaswords. Thefutureofhapticsisbrightbuttheonlysensualrelationshipitwillbesustaininganytimesoonisbetweenyouandyourcomputer. 44
Euthanasiaisclearlyadeliberateandintentionalaspectofakilling.Takingahumanlifeevenwithsubtleritesandconsentofthepartyinvolvedisbarbaric.Noonecanjustlykillanotherhumanbeing.Justasitiswrongforaserialkillertomurderitiswrongforaphysiciantodosoaswellnomatterwhatthemotivefordoingsomaybe.ManythinkersincludingalmostallorthodoxCatholicsbelievethateuthanasiaisimmoral.Theyopposekillingpatientsinanycircumstanceswhatever.Howevertheythinkitisallrightinsomespecialcircumstancestoallowpatientstodiebywithholdingtreatment.TheAmericanMedicalAssociation’spolicystatementonmercykillingsupportsthistraditionalview.InmypaperActiveandPassiveEuthanasiaIargueagainstthetraditionalviewthatthereisinfactnonormaldifferencebetweenkillingandlettingdie--ifoneispermissiblethensoistheother.ProfessorSullivandoesnotdisputemyargument;insteadhedismissesitasirrelevant.Thetraditionaldoctrinehesaysdoesnotappealtoordependonthedistinctionbetweenkillingandlettingdie.Thereforeargumentsagainstthatdistinctionleavethetraditionalpositionuntouched.IsmyargumentreallyirrelevantIdon’tseehowitcanbe.AsSullivanhimselfpointsoutnearlyeveryoneholdsthatitissometimesmeaninglesstoprolongtheprocessofdyingandthatinthosecasesitismorallypermissibletoletapatientdieeventhoughafewmorehoursordayscouldbesavedbyproceduresthatwouldalsoincreasetheagoniesofthedying.Butifitisimpossibletodefendageneraldistinctionbetweenlettingpeopledieandactingtoterminatetheirlivesdirectlythenitwouldseemthatactiveeuthanasiaalsomaybemorallypermissible.ButtraditionalistslikeprofessorSullivanholdthatactiveeuthanasia--thedirectkillingofpatients--isnotmorallypermissible;soifmyargumentissoundtheirviewmustbemistaken.Icannotagreethenthatmyargumentleavethetraditionalpositionuntouched.HoweverIshallnotpressthispoint.InsteadIshallpresentsomefurtherargumentsagainstthetraditionalpositionconcentratingonthoseelementsofthepositionwhichprofessorSullivanhimselfthinksmostimportant.Accordingtohimwhatisimportantisfirstthatweshouldneverintentionallyterminatethelifeofapatienteitherbyactionoromissionandsecondthatwemayceaseoromittreatmentofapatientknowingthatthiswillresultindeathonlyifthemeansoftreatmentinvolvedareextraordinary.WhichofthefollowingbestdefinesthewordomissionParagraph6
Asoneworkswithcolorinapracticalorexperimentalwayoneisimpressedbytwoapparentlyunrelatedfacts.Colorasseenisamobilechangeablething1toalargeextentontherelationshipofthecolor2othercolors3simultaneously.Itisnot4initsrelationtothedirectstimuluswhich5it.Ontheotherhandthepropertiesofsurfacesthatgive6tocolordonotseemtochangegreatlyunderawidevarietyofilluminationcolorusuallybutnotalwayslookingmuchthesameinartificiallightasindaylight.Bothoftheseeffectsseemtobe7inlargeparttothemechanismofcolor8. Whentheeyeis9toacoloredareathereisanimmediatereadjustmentofthe10oftheeyetocolorinandaroundthearea11.Thisreadjustmentdoesnotpromptlyaffectthecolorseenbutusuallydoesaffectthenextareatowhichthe12isshifted.Thelongerthetimeofviewingthehigherthe13andthelargertheareathegreatertheeffectwillbe14itspersistenceinthe15viewingsituation.AsindicatedbytheworkofWrightandSchoutenitappearsthatat16forafirstapproximationfulladaptationtakesplaceover17timeiftheadaptingsourceismoderatelybrightandtheeyehasbeenin18darknessjustpreviously.Also19ofthepersistenceoftheeffectiftheeyeisshiftedaroundfromoneobjecttoanotherallofwhichareatsimilarbrightnessorhavesimilarcolorstheadaptationwilltendtobecome20overthewholeeye. Readthefollowingtext.ChoosethebestwordsforeachnumberedblankandmarkABCandDonANSWERSHEET1.12
Inthesetimeswhenmarketforcesappearincreasinglycomplicatedandmorevolatileitisallthemoreimportanttounderstandtheprofessionaljargonandterminologyinthemarketplaceinordertobeabletobettermakeourinvestmentandbusinessdecisions.Understandingkeyeconomicindicatorswillassistinthedecisionmakingprocessprovidingasnapshotofthecurrentsituationandaninsightintothefuture. 46Eacheconomicindicatortellsussomethingabouttheeconomyorinflation.GrossDomesticProductGDPisprobablythemostimportantreportasitisthewholeframeworkwhereothereconomicindicatorsfallunder. Therearealsoindicatorsthatarebroadertellusabouttheeconomyitselfratherthanthecomponentse.g.employmentfiguresleadingindicatorsmoneysupplyfiguresM3.InflationfiguresProducePriceIndexPPIandtheConsumerPriceIndexCPIwillinshortinformusofthechangesinwholesalepricescostofconsumerretailgoodsandservicesrespectively. Anindicatorthatisusefulmustbeaccuratetimelyandreliable.Itdependsentirelyontheintegrityofthenationalstatisticalsystemresponsible.Itisvitaltoknowtheaccuratecomponentsofanindicator.Wehavetobemindfulofthelimitationofthesestatisticalfigurestoo. Someindicatorscanbehistoricorextremelyvolatileandthereforetheirvaluesarereduced.Itisbettertocomparethemostrecentdatawithearliermonthsortakeamovingaverageforthepast36or12monthstosmooththedata.Itwilltellusiftherehasbeenasignificantchangeintrendandwhetheranewdirectionisunderway. Timelinessofanindicatorisalsosignificant.47Althoughthereportedfiguresareimportantitiscrucialtorecognizethatmarketsreactmoretothevariancetotheconsensusforecastthantotheabsolutechangeintheindicator.48Marketsdonotlikesurprisesandcanbefrustratedwithvolatilityuponsubsequentrevisionstothenumberspublishedeventhoughsignificanceoftheabsolutenumberdiminisheswitheachpassingmonth. TheIndexofLeadingEconomicIndicatorsL.E.IintheUSactsasanearlywarningsystemtellinguswhentheeconomyisabouttochangedirection.49Thiscompositeindexof11leadingindicatorshasagoodrecordofprovidingaccurateforecasts.Thetotalindexperformsbetterasapredictiontoolthananyofitsparts.Thismonthlyfigureisavailableonthelastbusinessdayofthemonthandhaslowvolatility. 50AsageneralruleturningpointsintheeconomyaresignaledbythreeconsecutivemonthsofL.E.Ichangesinthesamedirection.Thisleadingindicatorislikealighthousegivingtherestoftheworldeconomiesaglimpseofthedirectionofthe’world’slargesteconomy. Marketsdonotlikesurprisesandcanbefrustratedwithvolatilityuponsubsequentrevisionstothenumberspublishedeventhoughsignificanceoftheabsolutenumberdiminisheswitheachpassingmonth.
求不定积分．
Inthesetimeswhenmarketforcesappearincreasinglycomplicatedandmorevolatileitisallthemoreimportanttounderstandtheprofessionaljargonandterminologyinthemarketplaceinordertobeabletobettermakeourinvestmentandbusinessdecisions.Understandingkeyeconomicindicatorswillassistinthedecisionmakingprocessprovidingasnapshotofthecurrentsituationandaninsightintothefuture. 46Eacheconomicindicatortellsussomethingabouttheeconomyorinflation.GrossDomesticProductGDPisprobablythemostimportantreportasitisthewholeframeworkwhereothereconomicindicatorsfallunder. Therearealsoindicatorsthatarebroadertellusabouttheeconomyitselfratherthanthecomponentse.g.employmentfiguresleadingindicatorsmoneysupplyfiguresM3.InflationfiguresProducePriceIndexPPIandtheConsumerPriceIndexCPIwillinshortinformusofthechangesinwholesalepricescostofconsumerretailgoodsandservicesrespectively. Anindicatorthatisusefulmustbeaccuratetimelyandreliable.Itdependsentirelyontheintegrityofthenationalstatisticalsystemresponsible.Itisvitaltoknowtheaccuratecomponentsofanindicator.Wehavetobemindfulofthelimitationofthesestatisticalfigurestoo. Someindicatorscanbehistoricorextremelyvolatileandthereforetheirvaluesarereduced.Itisbettertocomparethemostrecentdatawithearliermonthsortakeamovingaverageforthepast36or12monthstosmooththedata.Itwilltellusiftherehasbeenasignificantchangeintrendandwhetheranewdirectionisunderway. Timelinessofanindicatorisalsosignificant.47Althoughthereportedfiguresareimportantitiscrucialtorecognizethatmarketsreactmoretothevariancetotheconsensusforecastthantotheabsolutechangeintheindicator.48Marketsdonotlikesurprisesandcanbefrustratedwithvolatilityuponsubsequentrevisionstothenumberspublishedeventhoughsignificanceoftheabsolutenumberdiminisheswitheachpassingmonth. TheIndexofLeadingEconomicIndicatorsL.E.IintheUSactsasanearlywarningsystemtellinguswhentheeconomyisabouttochangedirection.49Thiscompositeindexof11leadingindicatorshasagoodrecordofprovidingaccurateforecasts.Thetotalindexperformsbetterasapredictiontoolthananyofitsparts.Thismonthlyfigureisavailableonthelastbusinessdayofthemonthandhaslowvolatility. 50AsageneralruleturningpointsintheeconomyaresignaledbythreeconsecutivemonthsofL.E.Ichangesinthesamedirection.Thisleadingindicatorislikealighthousegivingtherestoftheworldeconomiesaglimpseofthedirectionofthe’world’slargesteconomy. AsageneralruleturningpointsintheeconomyaresignaledbythreeconsecutivemonthsofL.E.Ichangesinthesamedirection.Thisleadingindicatorislikealighthousegivingtherestoftheworldeconomiesaglimpseofthedirectionofthe’world’slargesteconomy.
计算其中D=xy|0≤y≤1-xy≤x．
设线性齐次方程组AX=0为*在线性方程组*的基础上增添一个方程2x1+ax2-4x3+bx4=0得线性齐次方程组．BX=0为**问ab满足什么条件时方程组***是同解方程组．
Asoneworkswithcolorinapracticalorexperimentalwayoneisimpressedbytwoapparentlyunrelatedfacts.Colorasseenisamobilechangeablething1toalargeextentontherelationshipofthecolor2othercolors3simultaneously.Itisnot4initsrelationtothedirectstimuluswhich5it.Ontheotherhandthepropertiesofsurfacesthatgive6tocolordonotseemtochangegreatlyunderawidevarietyofilluminationcolorusuallybutnotalwayslookingmuchthesameinartificiallightasindaylight.Bothoftheseeffectsseemtobe7inlargeparttothemechanismofcolor8. Whentheeyeis9toacoloredareathereisanimmediatereadjustmentofthe10oftheeyetocolorinandaroundthearea11.Thisreadjustmentdoesnotpromptlyaffectthecolorseenbutusuallydoesaffectthenextareatowhichthe12isshifted.Thelongerthetimeofviewingthehigherthe13andthelargertheareathegreatertheeffectwillbe14itspersistenceinthe15viewingsituation.AsindicatedbytheworkofWrightandSchoutenitappearsthatat16forafirstapproximationfulladaptationtakesplaceover17timeiftheadaptingsourceismoderatelybrightandtheeyehasbeenin18darknessjustpreviously.Also19ofthepersistenceoftheeffectiftheeyeisshiftedaroundfromoneobjecttoanotherallofwhichareatsimilarbrightnessorhavesimilarcolorstheadaptationwilltendtobecome20overthewholeeye. Readthefollowingtext.ChoosethebestwordsforeachnumberedblankandmarkABCandDonANSWERSHEET1.16
已知u00=1求uxy及uxy的极值并问此极值是极大值还是极小值说明理由．
Whatoursocietysuffersfrommosttodayistheabsenceofconsensusaboutwhatitandlifeinitoughttobe;suchconsensuscannotbegainedfromsociety’spresentstageorfromfantasiesaboutwhatitoughttobe.Forthatthepresentistoocloseandtoodiversifiedandthefuturetoouncertaintomakebelievableclaimsaboutit.AconsensusinthepresenthencecanbeachievedonlythroughasharedunderstandingofthepastasHomer’sepicsinformedthosewholivedcenturieslaterwhatitmeanttobeGreekandbywhatimagesandidealstheyweretolivetheirlivesandorganizetheirsocieties.Mostsocietiesderiveconsensusfromalonghistoryalanguagealltheirownacommonreligioncommonancestry.Themythsbywhichtheylivearebasedonallofthese.ButtheUnitedStatesisacountryofimmigrantscomingfromagreatvarietyofnations.LatelyithasbeenemphasizedthatanasocialnarcissisticpersonalityhasbecomecharacteristicofAmericansandthatitisthistypeofpersonalitythatmakesforthelackofwell-beingbecauseitpreventsusfromachievingconsensusthatwouldcounteractatendencytowithdrawintoprivateworlds.InthisstudyofnarcissismChristopherLashsaysthatmodernmantorturedbyself-consciousnessturnstonewtherapiesnottofreehimselfofhispersonalworriesbuttofindmeaningandpurposeinlifetofindsomethingtolivefor.Thereiswidespreaddistressbecausenationalmoralehasdeclinedandwehavelostanearliersenseofnationalvisionandpurpose.Contrarytorigidreligionsorpoliticalbeliefsasarefoundintotalitariansocietiesourcultureisoneofthegreatindividualdifferencesatleastinprincipleandintheory;butthisleadstodisunityevenchaos.Americansbelieveinthevalueofdiversitybutjustbecauseoursisasocietybasedonindividualdiversityitneedsconsensusaboutsomedominatingideasmorethansocietiesbasedonuniformoriginoftheircitizens.Henceifwearetohaveconsensusitmustbebasedonamyth--avisionaboutacommonexperienceaconquestthatmadeusAmericansasthemythabouttheconquestofTroyformedtheGreeks.Onlyacommonmythcanofferrelieffromthefearthatlifeiswithoutmeaningorpurpose.Mythspermitustoexamineourplaceintheworldbycomparingittoasharedidea.Mythsaresharedfantasiesthatformthetie.thatbindstheindividualtoothermembersofhisgroup.Suchmythshelptowardofffeelingsofisolationsguiltanxietyandpurposelessness--inshorttheycombatisolationandthebreakdownofsocialstandardsandvalues.Homer’sepicsismentionedinParagraph1inorderto
[A]Extensiveapplicationsofhaptictechnology. [B]Possibilitiesrenderedbyhapticmechanisms. [C]Thefeasibilityofextendingoursensesandexploringabstractuniverses. [D]Anexampleoftheprogressinscienceofhaptics. [E]Bringingthepotentialofoursensesintofullplay. [F]Willhapticsstepintoabrightfuture "OOOF!"Usingyourmouseyouheaveadatafileacrossthescreen--acoupleofgigabytesofdataweighalot.Itsroughsurfacetellsyouthatitisagraphicsfile.Havingtippedthishugepileofdataintoahopperthatsendsittotherightprogramyouexamineascreenimageoftheforesttrailyou’llbehikingonyourvacation.Thenusingaglovedhandyoumasteritsdetailsbyrunningyourfingersoveritsforksandbendsitssharprisesandfalls.LateryousendanE-mailtoyourbelovedbendingtothedeskpadtoattachakiss. 41.__________. ThescienceofhapticsfromtheGreekhaptesthai"totouch"ismakingthesefantasiesreal.Afewprimitivedevicesareextendinghuman-machinecommunicationbeyondvisionandsound.Hapticjoysticksandsteeringwheelsforcomputergamesarealreadygivinghappyplayerssomeofthesensationsofpilotingaspaceshipdrivingaracingcarorfiringweapons.Intimehapticinterfacesmayallowustomanipulatesinglemoleculesfeelcloudsandgalaxiesevenreachintohigherdimensionstograspthesubtlestructuresofmathematics. 42.__________. Mostofoursensestirepassive.Inhearingandvisionforexamplethesoundorlightissimplyreceivedandanalyzed.Buttouchisdifferent:weactivelyexploreandalterrealitywithourhandssothesameactionthatgathersinformationcanalsochangetheworld--tomodelapieceofclayorpressabuttonforexample.Inprovidingdirectcontactbetweenpeopletouchcarriesemotionalimpact.Andinprovidingdirectcontactwiththeworlditisthesuresignofrealityasin"pinchme--amIdreaming" 43.__________. Somesmallstepshaveevenbeentakentowardswhole-bodyhaptics.TouchTechnologyofNovaScotiaCanadahasbuiltahapticchair.Itlookslikeafull-lengthloungechairinafamilydenbutitssurfaceisstuddedwith72"tactors"-pneumaticpistonrodscoveredwithroundedbuttonsthatcanextendaboutaninchandcanbedrivenundercomputercontrolinanydesiredsequenceandpattern.Itcouldbeprogrammedtoimitatearealmassageortofunctionintimetomusic.Accordingtothemanufacturerthatprovidesapowerfulblendingofsen-sations--along-termgoalofvirtualreality. 44.__________. Evenatitspresentcrudelevelhoweverhapticscanmaketangiblewhatoncecouldnotbetouchedorevenpictured.ToinvestigatetheworldoftheverysmallresearchersattheUniversityofNorthCarolinaChapelHillhavedevelopedthenanoManipulator.Thisaddstouchtothetechniqueofscanningprobemicroscopywhichcanimageasingleatombymonitoringeithertheelectricalcurrentflowingbetweenanextremelyfineprobeandasurfaceortheforcebetweenthem.WiththenanoManipulatorresearcherscanseeandmanipulateauniverseamilliontimessmallerthantheirowntostudyvirusesandtinysemiconductingdevices.Iftheforcefeedbackcanbemadesensitiveenoughitmaybepossibletopushmolecularkeysintospecificmolecularlockstocustom-designdrugsorassemblesiliconpartsintointricatenanomachines.Withotherinterfacesthereisnoreasonweshouldn’talsobeabletotouchtheverylarge-cloudsoceancurrentsmantleflowsmountainsgalaxyclusters.Ortheverystrong--withasuitableforcescalingnewceramicsoralloyscouldbesqueezedandtwangedtotesttheirengineeringproperties.Orthephysicallyextremeandinaccessible--suchasultrahotplasmaflowsinfusionmachines. 45.__________. Haptictechnologycouldevenmakeabstractideastangible.Manyscientificconceptsoccupyspacesofmorethanthreedimensionsstringtheoryfor’exampleassertsthatweliveina10or11-dimensionalUniverse.Asitisimpossibletovisualisesuchaspaceweexploretheseideas’throughmathematicalexpressionsortwodimensionalsketchesonpaper.Butprobingtheseunfamiliargeometrieswithtouchmaybemoreeffective.Andforblindpeoplehapticsoffersanewwaytograspinformationeveninthreedimensions.AgroupattheUniversityofDelawarehasdevelopedanenvironmentwhereapersoncanfeelamathematicalfunction.UsingaPHAN-TOMtheuser"walks"alongthesurfaceofthefigure.Likeahikerfollowingmountainousterraintheuserfeelswherethefunctionissteepwhereitislevelandwhereitspeaksandvalleyslie.OtherhapticsystemscouldhelpblindpeopletobrowsetheInternetfeelingimagesaswellaswords. Thefutureofhapticsisbrightbuttheonlysensualrelationshipitwillbesustaininganytimesoonisbetweenyouandyourcomputer. 42
Whenadiseaseofepidemicproportionsripsintothepopulacescientistsimmediatelygettoworktryingtolocatethesourceoftheafflictionandfindwaystocombatit.Oftentimessuccessisachievedasmedicalscienceisabletoisolatetheparasitegermorcellthatcausestheproblemandfindswaystoeffectivelykillorcontainit.Inthemostseriousofcasesinwhichtheentirepopulationofaregionorcountrymaybeatgraveriskitisdeemednecessarytoprotecttheentirepopulationthroughvaccinationsoastosafeguardlivesandensurethatthediseasewillnotspread.Theprocessofvaccinationallowsthepatient’sbodytodevelopimmunitytothevirusordiseasesothatifitisencounteredonecanwarditoffnaturally.Toaccomplishthisasmallweakordeadstrainofthediseaseisactuallyinjectedintothepatientinacontrolledenvironmentsothathisbody’simmunesystemcanlearntofighttheinvaderproperly.Informationonhowtopenetratethedisease’sdefensesistransmittedtoallelementsofthepatient’simmunesysteminaprocessthatoccursnaturallyinwhichgeneticinformationispassedfromcelltocell.Thismakessurethatshouldthepatientlatercomeintocontactwiththerealproblemhisbodyiswellequippedandtrainedtodealwithithavingalreadydonesobefore.Therearedangersinherentintheprocesshowever.Onoccasioneventheweakenedversionofthediseasecontainedinthevaccineprovestoomuchforthebodytohandleresultingintheimmunesystemsuccumbingandthereforethepatient’sdeath.SuchisthecaseofthesmallpoxvaccinedesignedtoeradicatethesmallpoxepidemicthatnearlywipedouttheentireNativeAmericanpopulationandkilledmassivenumbersofsettlers.Approximately1in10000peoplewhoreceivesthevaccinecontractthesmallpoxdiseasefromthevaccineitselfanddiesfromit.ThusiftheentirepopulationoftheUnitedStatesweretoreceivetheSmallpoxVaccinetoday3000Americanswouldbeleftdead.Fortunatelythesmallpoxviruswasconsiderederadicatedintheearly1970’sendingthemandatoryvaccinationofallbabiesinAmerica.Intheeventofareintroductionofthediseasehowevermandatoryvaccinationsmayresumeresultinginmoreunexpecteddeathsfromvaccination.Theprocesswhichistrulyamixedblessingmayindeedhidesomehiddencurses.WhatdoestheexampleoftheSmallpoxVaccineillustrate
Asoneworkswithcolorinapracticalorexperimentalwayoneisimpressedbytwoapparentlyunrelatedfacts.Colorasseenisamobilechangeablething1toalargeextentontherelationshipofthecolor2othercolors3simultaneously.Itisnot4initsrelationtothedirectstimuluswhich5it.Ontheotherhandthepropertiesofsurfacesthatgive6tocolordonotseemtochangegreatlyunderawidevarietyofilluminationcolorusuallybutnotalwayslookingmuchthesameinartificiallightasindaylight.Bothoftheseeffectsseemtobe7inlargeparttothemechanismofcolor8. Whentheeyeis9toacoloredareathereisanimmediatereadjustmentofthe10oftheeyetocolorinandaroundthearea11.Thisreadjustmentdoesnotpromptlyaffectthecolorseenbutusuallydoesaffectthenextareatowhichthe12isshifted.Thelongerthetimeofviewingthehigherthe13andthelargertheareathegreatertheeffectwillbe14itspersistenceinthe15viewingsituation.AsindicatedbytheworkofWrightandSchoutenitappearsthatat16forafirstapproximationfulladaptationtakesplaceover17timeiftheadaptingsourceismoderatelybrightandtheeyehasbeenin18darknessjustpreviously.Also19ofthepersistenceoftheeffectiftheeyeisshiftedaroundfromoneobjecttoanotherallofwhichareatsimilarbrightnessorhavesimilarcolorstheadaptationwilltendtobecome20overthewholeeye. Readthefollowingtext.ChoosethebestwordsforeachnumberedblankandmarkABCandDonANSWERSHEET1.18
A是实对称阵证明存在实数k＞0时使得kE+A是正定阵．
Inthesetimeswhenmarketforcesappearincreasinglycomplicatedandmorevolatileitisallthemoreimportanttounderstandtheprofessionaljargonandterminologyinthemarketplaceinordertobeabletobettermakeourinvestmentandbusinessdecisions.Understandingkeyeconomicindicatorswillassistinthedecisionmakingprocessprovidingasnapshotofthecurrentsituationandaninsightintothefuture. 46Eacheconomicindicatortellsussomethingabouttheeconomyorinflation.GrossDomesticProductGDPisprobablythemostimportantreportasitisthewholeframeworkwhereothereconomicindicatorsfallunder. Therearealsoindicatorsthatarebroadertellusabouttheeconomyitselfratherthanthecomponentse.g.employmentfiguresleadingindicatorsmoneysupplyfiguresM3.InflationfiguresProducePriceIndexPPIandtheConsumerPriceIndexCPIwillinshortinformusofthechangesinwholesalepricescostofconsumerretailgoodsandservicesrespectively. Anindicatorthatisusefulmustbeaccuratetimelyandreliable.Itdependsentirelyontheintegrityofthenationalstatisticalsystemresponsible.Itisvitaltoknowtheaccuratecomponentsofanindicator.Wehavetobemindfulofthelimitationofthesestatisticalfigurestoo. Someindicatorscanbehistoricorextremelyvolatileandthereforetheirvaluesarereduced.Itisbettertocomparethemostrecentdatawithearliermonthsortakeamovingaverageforthepast36or12monthstosmooththedata.Itwilltellusiftherehasbeenasignificantchangeintrendandwhetheranewdirectionisunderway. Timelinessofanindicatorisalsosignificant.47Althoughthereportedfiguresareimportantitiscrucialtorecognizethatmarketsreactmoretothevariancetotheconsensusforecastthantotheabsolutechangeintheindicator.48Marketsdonotlikesurprisesandcanbefrustratedwithvolatilityuponsubsequentrevisionstothenumberspublishedeventhoughsignificanceoftheabsolutenumberdiminisheswitheachpassingmonth. TheIndexofLeadingEconomicIndicatorsL.E.IintheUSactsasanearlywarningsystemtellinguswhentheeconomyisabouttochangedirection.49Thiscompositeindexof11leadingindicatorshasagoodrecordofprovidingaccurateforecasts.Thetotalindexperformsbetterasapredictiontoolthananyofitsparts.Thismonthlyfigureisavailableonthelastbusinessdayofthemonthandhaslowvolatility. 50AsageneralruleturningpointsintheeconomyaresignaledbythreeconsecutivemonthsofL.E.Ichangesinthesamedirection.Thisleadingindicatorislikealighthousegivingtherestoftheworldeconomiesaglimpseofthedirectionofthe’world’slargesteconomy. Eacheconomicindicatortellsussomethingabouttheeconomyorinflation.GrossDomesticProductGDPisprobablythemostimportantreportasitisthewholeframeworkwhereothereconomicindicatorsfallunder.
Inthenextcenturywe’llbeabletoalterourDNAradicallyencodingourvisionsandvanitieswhileconcoctingnewlife-forms.WhenDr.FrankensteinmadehismonsterhewrestledwiththemoralissueofwhetherheshouldallowittoreproduceHadItherightformyownbenefittoinflictthecurseuponeverlastinggenerationsWillsuchquestionsrequireustodevelopnewmoralphilosophiesProbablynot.Insteadwe’llreachagainforatime-testedmoralconceptonesometimescalledtheGoldenRuleandwhichKantthemillennium’smostprudentmoralistconjuredupintoacategoricalimperative:Dountoothersasyouwouldhavethemdountoyou;treateachpersonasanindividualratherthanasameanstosomeend.Underthismoralpreceptweshouldrecoilathumancloningbecauseitinevitablyentailsusinghumansasmeanstootherhumans’endsandvaluingthemascopiesofotherswelovedorascollectionsofbodypartsnotasindividualsintheirownright.WeshouldalsodrawalinehoweverfuzzythatwouldpermitusinggeneticengineeringtocurediseasesanddisabilitiesbutnottochangethepersonalattributesthatmakesomeoneanindividualIQphysicalappearancegenderandsexuality.Thebiotechagewillalsogiveusmorereasontoguardourpersonalprivacy.AldousHuxleyinBraveNewWorldgotitwrong:ratherthancentralizingpowerinthehandsofthestateDNAtechnologyhasempoweredindividualsandfamilies.Butthestatewillhaveanimportantrolemakingsurethatnooneincludinginsurancecompaniescanlookatourgeneticdatawithoutourpermissionoruseittodiscriminateagainstus.Thenwecangetreadyforthebreakthroughsthatcouldcomeattheendofthenextcenturyandthetechnologyiscomparabletomappingourgenes:plottingthe10billionormoreneuronsofourbrain.Withthatinformationwemightsomedaybeabletocreateartificialintelligencesthatthinkandexperienceconsciousnessinwaysthatareindistinguishablefromahumanbrain.Eventuallywemightbeabletoreplicateourownmindsinadry-waremachinesothatwecouldliveonwithoutthewet-wareofabiologicalbrainandbody.The20thcentury’srevolutionininfotechnologywilltherebymergewiththe21stcentury’srevolutioninbiotechnology.Butthisissciencefiction.Let’sturnthepagenowandgetbacktorealscience.FromthetextwelearnthatAldousHuxleyisoftheopinionthat
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