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设P(x)=x3+ax2+bx+c,设方程P(x)=0有三个相异的实根x1,x2,x3,且x1<x2<x3,试证:若,则存在点ξ∈(x1,x2),使
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设n阶矩阵A的秩为n-2α1α2α3是非齐次线性方程组Ax=b的三个线性无关的解则Ax=b的通解为_
设A为三阶实对称矩阵为方程组AX=0的解为方程组2E-Ax=0的一个解|E+A|=0则A=_____
设关于x的一元二次方程x2+2ax+b2=0.若a是从区间[03]任取的一个数b是从区间[02]任取
已知下列三个方程x2+4ax-4a+3=0x2+a-1x+a2=0x2+2ax-2a=0至少有一个方
设三个方程x2+4mx+4m2+2m+3=0x2+2m+1x+m2=0m-1x2+2mx+m-1=0
设A为m×n矩阵且[*]其中[*].Ⅰ证明方程组AX=b有且仅有n-r+1个线性无关解Ⅱ[*]有三个
用反证法证明命题设ab为实数则方程x2+ax+b=0至少有一个实根时要做的假设是
方程x
2
+ax+b=0没有实根
方程x
2
+ax+b=0至多有一个实根
方程x
2
+ax+b=0至多有两个实根
方程x
2
+ax+b=0恰好有两个实根
设方程x3-3x+q=0有三个实根求q的取值范围.
若a2-3b<0则方程x3+ax2+bx+c=0
无实根
有唯一实根
有两个实根
有三个实根
设n阶矩阵A的伴随矩阵A*≠0若ξ1ξ2ξ3ξ4是非齐次线性方程组Ax=b的互不相等的解则对应的齐次
不存在
仅含一个非零解向量
含有两个线性无关的解向量
含有三个线性无关的解向量
已知下列三个方程x2+4ax-4a+3=0x2+a-1x+a2=0x2+2ax-2a=0其中至少有一
设线性方程组Ax=b有m个方程n个未知数且m≠n则正确命题是
若Ax=0只有零解,则Ax=b必有唯一解.
若Ax=0有非零解,则Ax=b必有无穷多解.
若Ax=b无解,则Ax=0只有零解.
若Ax=b有无穷多解,则Ax=0必有非零解.
设P是3×3矩阵其秩为2考虑方程组PX=P=0 设ζ1和ζ2为PX=O的两个解c1c2为实
设关于x的一元二次方程+2ax+b=01若a是从0123四个数中任取的一个数b是从012三个数中任取
用反证法证明命题设ab为实数则方程x3+ax+b=0至少有一个实根时要做的假设是
方程x
3
+ax+b=0没有实根
方程x
3
+ax+b=0至多有一个实根
方程x
3
+ax+b=0至多有两个实根
方程x
3
+ax+b=0恰好有两个实根
设fx=ax3+x恰有三个单调区间试确定实数a的取值范围并求出这三个单调区间.
设关于x的一元二次方程x2+2ax+b2=0若a是从0123四个数字中任取的一个数b是从012三个数
设A3×3是实对称矩阵|A|=-12A的三个特征值之和为1且α=10-2T是方程组A*-4Ex=0的
若a2-3b<0则方程x3+ax2+bx+c=0
无实根
有唯一实根
有两个实根
有三个实根
设Px=x3+ax2+bx+c设方程Px=0有三个相异的实根x1x2x3且x1<x2<x3试证P’x
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Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassical.In1worldduringthefifteenthcenturytheterm"reading"2meantreadingaloud.Onlyduringthenineteenthcenturydidsilentreadingbecomecommonplace.Oneshouldbewaryhoweverof3thatsilentreadingcameaboutsimplybecausereadingaloudisan4toothers.Examinationoffactorsrelatedtothe5developmentofsilentreadingrevealsthatitbecametheusualmodeofreadingformostadultreadingtasksmainlybecausethetasksthemselveschangedin6. Thelastcenturysawasteadygradualincreasein7andthusinthenumberofreaders.Asreadersincreasedthenumberofpotentiallisteners8andthustherewassome9intheneedtoreadaloud.Asreadingforthebenefitoflistenersgrewlesscommonsocametheflourishingofreadingasa10activityinsuchpublicplacesaslibrariesrailwaycarriagesandofficeswherereadingaloudwould11distractiontootherreaders. Towardstheendofthecenturytherewasstill12argumentoverwhetherbooksshouldbeusedforinformationortreated13andoverwhetherthereadingofmaterialsuchasnewspaperswasinsomeway14weakening.Indeedthisargumentstillremainswithusineducation.15itsvirtuestheoldsharedliteracyculturehadgoneandwas16bytheprintedmassmediaontheonehandandbybooksandperiodicalsfora17readershipontheother. Bytheendofthecenturystudentswerebeingrecommendedtoadoptattitudestobooksandtouseskillsinreadingthemwhichwereinappropriate18notimpossiblefortheoralreader.Thesocialculturalandtechnologicalchangesinthecenturyhadgreatly19whattheterm"reading"20. Readthefollowingtext.Choosethebestwordsforeachnumberedblankandmark[A][B][C]or[D]onANSWERSHEET1.19
Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassical.In1worldduringthefifteenthcenturytheterm"reading"2meantreadingaloud.Onlyduringthenineteenthcenturydidsilentreadingbecomecommonplace.Oneshouldbewaryhoweverof3thatsilentreadingcameaboutsimplybecausereadingaloudisan4toothers.Examinationoffactorsrelatedtothe5developmentofsilentreadingrevealsthatitbecametheusualmodeofreadingformostadultreadingtasksmainlybecausethetasksthemselveschangedin6. Thelastcenturysawasteadygradualincreasein7andthusinthenumberofreaders.Asreadersincreasedthenumberofpotentiallisteners8andthustherewassome9intheneedtoreadaloud.Asreadingforthebenefitoflistenersgrewlesscommonsocametheflourishingofreadingasa10activityinsuchpublicplacesaslibrariesrailwaycarriagesandofficeswherereadingaloudwould11distractiontootherreaders. Towardstheendofthecenturytherewasstill12argumentoverwhetherbooksshouldbeusedforinformationortreated13andoverwhetherthereadingofmaterialsuchasnewspaperswasinsomeway14weakening.Indeedthisargumentstillremainswithusineducation.15itsvirtuestheoldsharedliteracyculturehadgoneandwas16bytheprintedmassmediaontheonehandandbybooksandperiodicalsfora17readershipontheother. Bytheendofthecenturystudentswerebeingrecommendedtoadoptattitudestobooksandtouseskillsinreadingthemwhichwereinappropriate18notimpossiblefortheoralreader.Thesocialculturalandtechnologicalchangesinthecenturyhadgreatly19whattheterm"reading"20. Readthefollowingtext.Choosethebestwordsforeachnumberedblankandmark[A][B][C]or[D]onANSWERSHEET1.13
Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassical.In1worldduringthefifteenthcenturytheterm"reading"2meantreadingaloud.Onlyduringthenineteenthcenturydidsilentreadingbecomecommonplace.Oneshouldbewaryhoweverof3thatsilentreadingcameaboutsimplybecausereadingaloudisan4toothers.Examinationoffactorsrelatedtothe5developmentofsilentreadingrevealsthatitbecametheusualmodeofreadingformostadultreadingtasksmainlybecausethetasksthemselveschangedin6. Thelastcenturysawasteadygradualincreasein7andthusinthenumberofreaders.Asreadersincreasedthenumberofpotentiallisteners8andthustherewassome9intheneedtoreadaloud.Asreadingforthebenefitoflistenersgrewlesscommonsocametheflourishingofreadingasa10activityinsuchpublicplacesaslibrariesrailwaycarriagesandofficeswherereadingaloudwould11distractiontootherreaders. Towardstheendofthecenturytherewasstill12argumentoverwhetherbooksshouldbeusedforinformationortreated13andoverwhetherthereadingofmaterialsuchasnewspaperswasinsomeway14weakening.Indeedthisargumentstillremainswithusineducation.15itsvirtuestheoldsharedliteracyculturehadgoneandwas16bytheprintedmassmediaontheonehandandbybooksandperiodicalsfora17readershipontheother. Bytheendofthecenturystudentswerebeingrecommendedtoadoptattitudestobooksandtouseskillsinreadingthemwhichwereinappropriate18notimpossiblefortheoralreader.Thesocialculturalandtechnologicalchangesinthecenturyhadgreatly19whattheterm"reading"20. Readthefollowingtext.Choosethebestwordsforeachnumberedblankandmark[A][B][C]or[D]onANSWERSHEET1.5
Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassical.In1worldduringthefifteenthcenturytheterm"reading"2meantreadingaloud.Onlyduringthenineteenthcenturydidsilentreadingbecomecommonplace.Oneshouldbewaryhoweverof3thatsilentreadingcameaboutsimplybecausereadingaloudisan4toothers.Examinationoffactorsrelatedtothe5developmentofsilentreadingrevealsthatitbecametheusualmodeofreadingformostadultreadingtasksmainlybecausethetasksthemselveschangedin6. Thelastcenturysawasteadygradualincreasein7andthusinthenumberofreaders.Asreadersincreasedthenumberofpotentiallisteners8andthustherewassome9intheneedtoreadaloud.Asreadingforthebenefitoflistenersgrewlesscommonsocametheflourishingofreadingasa10activityinsuchpublicplacesaslibrariesrailwaycarriagesandofficeswherereadingaloudwould11distractiontootherreaders. Towardstheendofthecenturytherewasstill12argumentoverwhetherbooksshouldbeusedforinformationortreated13andoverwhetherthereadingofmaterialsuchasnewspaperswasinsomeway14weakening.Indeedthisargumentstillremainswithusineducation.15itsvirtuestheoldsharedliteracyculturehadgoneandwas16bytheprintedmassmediaontheonehandandbybooksandperiodicalsfora17readershipontheother. Bytheendofthecenturystudentswerebeingrecommendedtoadoptattitudestobooksandtouseskillsinreadingthemwhichwereinappropriate18notimpossiblefortheoralreader.Thesocialculturalandtechnologicalchangesinthecenturyhadgreatly19whattheterm"reading"20. Readthefollowingtext.Choosethebestwordsforeachnumberedblankandmark[A][B][C]or[D]onANSWERSHEET1.1
在商业银行经营管理理论演变的过程中把管理的重点主要放在流动性上的是理论
如果一国处于国内均衡但国际收支有盈余的状况这时最适宜采用下列项宏观调节政策
Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassical.In1worldduringthefifteenthcenturytheterm"reading"2meantreadingaloud.Onlyduringthenineteenthcenturydidsilentreadingbecomecommonplace.Oneshouldbewaryhoweverof3thatsilentreadingcameaboutsimplybecausereadingaloudisan4toothers.Examinationoffactorsrelatedtothe5developmentofsilentreadingrevealsthatitbecametheusualmodeofreadingformostadultreadingtasksmainlybecausethetasksthemselveschangedin6. Thelastcenturysawasteadygradualincreasein7andthusinthenumberofreaders.Asreadersincreasedthenumberofpotentiallisteners8andthustherewassome9intheneedtoreadaloud.Asreadingforthebenefitoflistenersgrewlesscommonsocametheflourishingofreadingasa10activityinsuchpublicplacesaslibrariesrailwaycarriagesandofficeswherereadingaloudwould11distractiontootherreaders. Towardstheendofthecenturytherewasstill12argumentoverwhetherbooksshouldbeusedforinformationortreated13andoverwhetherthereadingofmaterialsuchasnewspaperswasinsomeway14weakening.Indeedthisargumentstillremainswithusineducation.15itsvirtuestheoldsharedliteracyculturehadgoneandwas16bytheprintedmassmediaontheonehandandbybooksandperiodicalsfora17readershipontheother. Bytheendofthecenturystudentswerebeingrecommendedtoadoptattitudestobooksandtouseskillsinreadingthemwhichwereinappropriate18notimpossiblefortheoralreader.Thesocialculturalandtechnologicalchangesinthecenturyhadgreatly19whattheterm"reading"20. Readthefollowingtext.Choosethebestwordsforeachnumberedblankandmark[A][B][C]or[D]onANSWERSHEET1.3
试用消费和储蓄的生命周期理论解释当前中国居民的低消费高储蓄行为
下列关于Black-Scholes期权定价模型假设前提说法不正确的是
Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassical.In1worldduringthefifteenthcenturytheterm"reading"2meantreadingaloud.Onlyduringthenineteenthcenturydidsilentreadingbecomecommonplace.Oneshouldbewaryhoweverof3thatsilentreadingcameaboutsimplybecausereadingaloudisan4toothers.Examinationoffactorsrelatedtothe5developmentofsilentreadingrevealsthatitbecametheusualmodeofreadingformostadultreadingtasksmainlybecausethetasksthemselveschangedin6. Thelastcenturysawasteadygradualincreasein7andthusinthenumberofreaders.Asreadersincreasedthenumberofpotentiallisteners8andthustherewassome9intheneedtoreadaloud.Asreadingforthebenefitoflistenersgrewlesscommonsocametheflourishingofreadingasa10activityinsuchpublicplacesaslibrariesrailwaycarriagesandofficeswherereadingaloudwould11distractiontootherreaders. Towardstheendofthecenturytherewasstill12argumentoverwhetherbooksshouldbeusedforinformationortreated13andoverwhetherthereadingofmaterialsuchasnewspaperswasinsomeway14weakening.Indeedthisargumentstillremainswithusineducation.15itsvirtuestheoldsharedliteracyculturehadgoneandwas16bytheprintedmassmediaontheonehandandbybooksandperiodicalsfora17readershipontheother. Bytheendofthecenturystudentswerebeingrecommendedtoadoptattitudestobooksandtouseskillsinreadingthemwhichwereinappropriate18notimpossiblefortheoralreader.Thesocialculturalandtechnologicalchangesinthecenturyhadgreatly19whattheterm"reading"20. Readthefollowingtext.Choosethebestwordsforeachnumberedblankandmark[A][B][C]or[D]onANSWERSHEET1.9
Agrowingnumberofwomenarerisingtothetop--andbeginningtochangethecultureoftheworkplace.Thisshouldbeaseasonofcelebration.Afterallbymanymeasuresthere’sneverbeenabettertimetobeawoman.InplaceslikeScandinaviaandBritainathirdormoreofallcorporatemanagersarenowwomen.ThenumberoffemaleexecutivedirectorsofFISE100companiesnearlydoubledfrom2000to2004.LatinAmericahasseena50percentjumpinthenumberofwomenpoliticiansinthelastdecade.Japanvoted26newfemaleparliamentariansintoofficethisyear.Ofcoursethejewelintheequal-opportunitycrownwasthisfall’selectionofAngelaMerkel--oncenicknamedtheGirlbyHelmutKohl--toGermany’shighestoffice.Butasalwaysstatisticstellamultifacetedstory.Sureit’snolongerananomalytohaveafemaleCEO--buttherearestillonly17femaleexecutivedirectorsinthelargestFTSE100companies.IntheEUParliamentonly23outof162membersarefemale.InBritainstudiesshowthatwomenhaveneverbeenmoredissatisfiedwiththeworkplace.Nowonder:theEUpaygapbetweenmenandwomenshrankonlyonepointinthelastcoupleofyearsto17.5percent.SowheredoesallthisleaveusWithsomebigchallengesthatrequiremorefemaleleadershiptosolve.Atsomemajorcompanies--includingShellandBritishTelecom--womenarecombatingtheold-boys’clubatmospherebystartingtheirownnetworkslinkingtopfemaleleaderswithup-and-comerstheycanmentor.Laborflexibilityisalsoontheagenda;inpartsofEuropetopfemalelegislatorshavefoughttogiveemployeeswithchildrenorelderlyparentstherighttoaskforadjustablehours.Perhapsmostimportantthereisanincreasinglyvibrantdebatearoundwork-lifebalance.Studyafterstudyshowsthatitisaworkingwoman’ssecondfull-timejob--ascaregiver--thatmakesitmostdifficultforhertostayonthecareerladder.Whileextrabenefitsandlongermaternityleavecanhelptheyaren’tacompletesolution.Clearlysomeout-of-the-boxthinkingisrequired.Andthat’swherewomencomein.IncountrieslikeCameroonBoliviaandMalaysiagreaternumbersofwomeninpublicofficehaveresultedinlessspendingonthemilitaryandmoreonhealtheducationandinfrastructure.Norway’swoman-heavyParliamentrecentlypassedalawmandatingthat40percentofdirectorsoncorporateboardsbewomen.AndinGermanythearchetypaloutsider--awomanwhogrewuponthewrongsideoftheIronCurtain--willlikelytakethehelminacountrywithvirtuallynootherwomenintoppositionsofpower.NolongertheGirlbutpoisedtobecomethechancellorMerkelisasymbolofhowfarwomenhavecome--andtheworkthatremainstobedone.Whichstatementistrueaboutthechallengefacedbythefemaleleadership
Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassical.In1worldduringthefifteenthcenturytheterm"reading"2meantreadingaloud.Onlyduringthenineteenthcenturydidsilentreadingbecomecommonplace.Oneshouldbewaryhoweverof3thatsilentreadingcameaboutsimplybecausereadingaloudisan4toothers.Examinationoffactorsrelatedtothe5developmentofsilentreadingrevealsthatitbecametheusualmodeofreadingformostadultreadingtasksmainlybecausethetasksthemselveschangedin6. Thelastcenturysawasteadygradualincreasein7andthusinthenumberofreaders.Asreadersincreasedthenumberofpotentiallisteners8andthustherewassome9intheneedtoreadaloud.Asreadingforthebenefitoflistenersgrewlesscommonsocametheflourishingofreadingasa10activityinsuchpublicplacesaslibrariesrailwaycarriagesandofficeswherereadingaloudwould11distractiontootherreaders. Towardstheendofthecenturytherewasstill12argumentoverwhetherbooksshouldbeusedforinformationortreated13andoverwhetherthereadingofmaterialsuchasnewspaperswasinsomeway14weakening.Indeedthisargumentstillremainswithusineducation.15itsvirtuestheoldsharedliteracyculturehadgoneandwas16bytheprintedmassmediaontheonehandandbybooksandperiodicalsfora17readershipontheother. Bytheendofthecenturystudentswerebeingrecommendedtoadoptattitudestobooksandtouseskillsinreadingthemwhichwereinappropriate18notimpossiblefortheoralreader.Thesocialculturalandtechnologicalchangesinthecenturyhadgreatly19whattheterm"reading"20. Readthefollowingtext.Choosethebestwordsforeachnumberedblankandmark[A][B][C]or[D]onANSWERSHEET1.11
简述什么是货币替代
Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassical.In1worldduringthefifteenthcenturytheterm"reading"2meantreadingaloud.Onlyduringthenineteenthcenturydidsilentreadingbecomecommonplace.Oneshouldbewaryhoweverof3thatsilentreadingcameaboutsimplybecausereadingaloudisan4toothers.Examinationoffactorsrelatedtothe5developmentofsilentreadingrevealsthatitbecametheusualmodeofreadingformostadultreadingtasksmainlybecausethetasksthemselveschangedin6. Thelastcenturysawasteadygradualincreasein7andthusinthenumberofreaders.Asreadersincreasedthenumberofpotentiallisteners8andthustherewassome9intheneedtoreadaloud.Asreadingforthebenefitoflistenersgrewlesscommonsocametheflourishingofreadingasa10activityinsuchpublicplacesaslibrariesrailwaycarriagesandofficeswherereadingaloudwould11distractiontootherreaders. Towardstheendofthecenturytherewasstill12argumentoverwhetherbooksshouldbeusedforinformationortreated13andoverwhetherthereadingofmaterialsuchasnewspaperswasinsomeway14weakening.Indeedthisargumentstillremainswithusineducation.15itsvirtuestheoldsharedliteracyculturehadgoneandwas16bytheprintedmassmediaontheonehandandbybooksandperiodicalsfora17readershipontheother. Bytheendofthecenturystudentswerebeingrecommendedtoadoptattitudestobooksandtouseskillsinreadingthemwhichwereinappropriate18notimpossiblefortheoralreader.Thesocialculturalandtechnologicalchangesinthecenturyhadgreatly19whattheterm"reading"20. Readthefollowingtext.Choosethebestwordsforeachnumberedblankandmark[A][B][C]or[D]onANSWERSHEET1.17
Agrowingnumberofwomenarerisingtothetop--andbeginningtochangethecultureoftheworkplace.Thisshouldbeaseasonofcelebration.Afterallbymanymeasuresthere’sneverbeenabettertimetobeawoman.InplaceslikeScandinaviaandBritainathirdormoreofallcorporatemanagersarenowwomen.ThenumberoffemaleexecutivedirectorsofFISE100companiesnearlydoubledfrom2000to2004.LatinAmericahasseena50percentjumpinthenumberofwomenpoliticiansinthelastdecade.Japanvoted26newfemaleparliamentariansintoofficethisyear.Ofcoursethejewelintheequal-opportunitycrownwasthisfall’selectionofAngelaMerkel--oncenicknamedtheGirlbyHelmutKohl--toGermany’shighestoffice.Butasalwaysstatisticstellamultifacetedstory.Sureit’snolongerananomalytohaveafemaleCEO--buttherearestillonly17femaleexecutivedirectorsinthelargestFTSE100companies.IntheEUParliamentonly23outof162membersarefemale.InBritainstudiesshowthatwomenhaveneverbeenmoredissatisfiedwiththeworkplace.Nowonder:theEUpaygapbetweenmenandwomenshrankonlyonepointinthelastcoupleofyearsto17.5percent.SowheredoesallthisleaveusWithsomebigchallengesthatrequiremorefemaleleadershiptosolve.Atsomemajorcompanies--includingShellandBritishTelecom--womenarecombatingtheold-boys’clubatmospherebystartingtheirownnetworkslinkingtopfemaleleaderswithup-and-comerstheycanmentor.Laborflexibilityisalsoontheagenda;inpartsofEuropetopfemalelegislatorshavefoughttogiveemployeeswithchildrenorelderlyparentstherighttoaskforadjustablehours.Perhapsmostimportantthereisanincreasinglyvibrantdebatearoundwork-lifebalance.Studyafterstudyshowsthatitisaworkingwoman’ssecondfull-timejob--ascaregiver--thatmakesitmostdifficultforhertostayonthecareerladder.Whileextrabenefitsandlongermaternityleavecanhelptheyaren’tacompletesolution.Clearlysomeout-of-the-boxthinkingisrequired.Andthat’swherewomencomein.IncountrieslikeCameroonBoliviaandMalaysiagreaternumbersofwomeninpublicofficehaveresultedinlessspendingonthemilitaryandmoreonhealtheducationandinfrastructure.Norway’swoman-heavyParliamentrecentlypassedalawmandatingthat40percentofdirectorsoncorporateboardsbewomen.AndinGermanythearchetypaloutsider--awomanwhogrewuponthewrongsideoftheIronCurtain--willlikelytakethehelminacountrywithvirtuallynootherwomenintoppositionsofpower.NolongertheGirlbutpoisedtobecomethechancellorMerkelisasymbolofhowfarwomenhavecome--andtheworkthatremainstobedone.Accordingtoparagraphtwowhatisthemostimportantissueofwomen’sachievementinpolitics
CouldHIVthevirusthatcausesAIDSbeweakeningTheresultsofastudyconductedinBelgiumattheInstituteofTropicalMedicineinAntwerpseemtosuggestthatinonecorneroftheworlditmightbe.ThereportpublishedinthelatestissueofAIDSaspecialistjournalconcludesthatHIV’sabilitytoreplicateknowntechnicallyasitsvirulencemayhavedecreasedsincethestartofthepandemic.KevinAdentheleadauthorofthepaperstressesthatthestudyisbasedonasmallsetofsamplesanddoesnotprovethatHIV’svirulenceisattenuatingaroundtheworld.Howeveritdoesoffernewinsightsintotheevolutionofthedisease.Dr.Arienlookedat24bloodsamplescollectedfromuntreatedpatientsattendinganHIV/AIDSclinicinAntwerp.Adozenofthesesamplesweretakenbetween1986and1989;theother12werecollectedbetween2002and2003.Firstheanalyzedthesamplestofindtheirviralloadthenumberofvirusparticlespercubiccentimeterandthesubtypeofvirusinvolved.InEuropeandNorthAmericathepredominantsubtypeisB;insub-SaharanAfricawheretheepidemicisatitsworstthepredominantsubtypeisC.MostofDr.Arien’ssampleswereofsubtypeB.Havingdonethisanalysishepairedthesamplesoffforaseriesofreplicativeduels.Eachsamplefromtheearlierserieswasmatchedwiththemostsimilaronefromthelaterseriesandtheywereplacedinidenticalcellculturestoseewhichwouldmultiplythemost.Theresultwasthat75%ofthevirusesfrom2002-03werelessvirulentthanapparentlysimilarcounterpartsfrom1986-89--astatisticallysignificantobservation.Dr.Arien’scautionissensibleatleastuntilsomeonereplicatestheworkelsewhere.Buthisconclusionisnotnecessarilysurprising.Suchviralattenuationasitisknownisonewaythatvaccinesareproduced.Whatcausesattenuationinwildvirusesthoughisamatterofspeculation.DrArienbelievesthatinthiscasetheattenuationcouldbetheresultofwhathecallsserialgeneticbottlenecksduringtransmissionfromhosttohost.Theseacttoreducethegeneticdiversityandthusthereplicativefitnessofthevirus.GeneticdiversityisknowntobeanimportantcomponentofHIV’svirulence.Butwhatmightcausethebottlenecksisstillunclear.AsecondreasonforcautionbesidesthesmallsizeofthestudyisasGeoffreyGarnettaprofessorofmicroparasiteepidemiologyatImperialCollegeLondonpointsoutthattheabilityofavirustoinfectcellsinatest-tubeisnotthesameasitsabilitytocausediseaseanddeathinahumanhost.NeverthelessDrAden’sresultisintriguingandsurelyworthfollowingupinalargerpieceofresearch.Whichofthefollowingistrueaccordingtothetext
需求规律说明
下列属于存款性金融机构的是
Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassical.In1worldduringthefifteenthcenturytheterm"reading"2meantreadingaloud.Onlyduringthenineteenthcenturydidsilentreadingbecomecommonplace.Oneshouldbewaryhoweverof3thatsilentreadingcameaboutsimplybecausereadingaloudisan4toothers.Examinationoffactorsrelatedtothe5developmentofsilentreadingrevealsthatitbecametheusualmodeofreadingformostadultreadingtasksmainlybecausethetasksthemselveschangedin6. Thelastcenturysawasteadygradualincreasein7andthusinthenumberofreaders.Asreadersincreasedthenumberofpotentiallisteners8andthustherewassome9intheneedtoreadaloud.Asreadingforthebenefitoflistenersgrewlesscommonsocametheflourishingofreadingasa10activityinsuchpublicplacesaslibrariesrailwaycarriagesandofficeswherereadingaloudwould11distractiontootherreaders. Towardstheendofthecenturytherewasstill12argumentoverwhetherbooksshouldbeusedforinformationortreated13andoverwhetherthereadingofmaterialsuchasnewspaperswasinsomeway14weakening.Indeedthisargumentstillremainswithusineducation.15itsvirtuestheoldsharedliteracyculturehadgoneandwas16bytheprintedmassmediaontheonehandandbybooksandperiodicalsfora17readershipontheother. Bytheendofthecenturystudentswerebeingrecommendedtoadoptattitudestobooksandtouseskillsinreadingthemwhichwereinappropriate18notimpossiblefortheoralreader.Thesocialculturalandtechnologicalchangesinthecenturyhadgreatly19whattheterm"reading"20. Readthefollowingtext.Choosethebestwordsforeachnumberedblankandmark[A][B][C]or[D]onANSWERSHEET1.7
CouldHIVthevirusthatcausesAIDSbeweakeningTheresultsofastudyconductedinBelgiumattheInstituteofTropicalMedicineinAntwerpseemtosuggestthatinonecorneroftheworlditmightbe.ThereportpublishedinthelatestissueofAIDSaspecialistjournalconcludesthatHIV’sabilitytoreplicateknowntechnicallyasitsvirulencemayhavedecreasedsincethestartofthepandemic.KevinAdentheleadauthorofthepaperstressesthatthestudyisbasedonasmallsetofsamplesanddoesnotprovethatHIV’svirulenceisattenuatingaroundtheworld.Howeveritdoesoffernewinsightsintotheevolutionofthedisease.Dr.Arienlookedat24bloodsamplescollectedfromuntreatedpatientsattendinganHIV/AIDSclinicinAntwerp.Adozenofthesesamplesweretakenbetween1986and1989;theother12werecollectedbetween2002and2003.Firstheanalyzedthesamplestofindtheirviralloadthenumberofvirusparticlespercubiccentimeterandthesubtypeofvirusinvolved.InEuropeandNorthAmericathepredominantsubtypeisB;insub-SaharanAfricawheretheepidemicisatitsworstthepredominantsubtypeisC.MostofDr.Arien’ssampleswereofsubtypeB.Havingdonethisanalysishepairedthesamplesoffforaseriesofreplicativeduels.Eachsamplefromtheearlierserieswasmatchedwiththemostsimilaronefromthelaterseriesandtheywereplacedinidenticalcellculturestoseewhichwouldmultiplythemost.Theresultwasthat75%ofthevirusesfrom2002-03werelessvirulentthanapparentlysimilarcounterpartsfrom1986-89--astatisticallysignificantobservation.Dr.Arien’scautionissensibleatleastuntilsomeonereplicatestheworkelsewhere.Buthisconclusionisnotnecessarilysurprising.Suchviralattenuationasitisknownisonewaythatvaccinesareproduced.Whatcausesattenuationinwildvirusesthoughisamatterofspeculation.DrArienbelievesthatinthiscasetheattenuationcouldbetheresultofwhathecallsserialgeneticbottlenecksduringtransmissionfromhosttohost.Theseacttoreducethegeneticdiversityandthusthereplicativefitnessofthevirus.GeneticdiversityisknowntobeanimportantcomponentofHIV’svirulence.Butwhatmightcausethebottlenecksisstillunclear.AsecondreasonforcautionbesidesthesmallsizeofthestudyisasGeoffreyGarnettaprofessorofmicroparasiteepidemiologyatImperialCollegeLondonpointsoutthattheabilityofavirustoinfectcellsinatest-tubeisnotthesameasitsabilitytocausediseaseanddeathinahumanhost.NeverthelessDrAden’sresultisintriguingandsurelyworthfollowingupinalargerpieceofresearch.ThewordattenuatingLine6Paragraph1mostprobablymeans
DespitethedoubtsanddespitecomplaintsfromshopownersLondon’scongestioncharge--introducedinFebruary2003--hasmanagedtoeasethegridlockinthecitycentre.Trafficisdownby18%jamsby30%.Thescheme’sbiggestweaknessisthatitiscrude:driverspay£8$14toenterthezonebetween7amand6:30pmregardlessofhowcongestedtheroadsareorhowlongtheystay.Soroad-pricingfansarewatchingtrialsbyTransportforLondonTfLofanewdetectionsystemcalledtag-and-beaconwithinterest.UndersuchaschemeusedinSingaporeandonsomeEuropeanroadscarsarefittedwithelectronictagsthatarereadbyroadsidemasts.IfthetrialissuccessfulTfLsaysthatthecitycouldswitchtothesystemoncethecontracttorunthecongestionchargeisre-letin2009.Currentlycamerasareusedtoreadlicenseplatesandtrackmotorists.Theyarenotalwaysreliable:anindividualcameraidentifiesonlyaround70%ofcars.Mostdrivengetphotographedmorethanoncewhichbooststhesystem’seffectivenesstoover95%butthatstillleavesseveralthousandvehiclesperdaywhosedetailsmustbelaboriouslycheckedbyhand.Tag-and-beacontechnologyismuchmoreaccuratewithanidentificationrateofover99%.TfLsaysthetrialispartlydesignedtoseewhetherthenewsystemcouldallowdriverstopaychargesbydirectdebit.Thatwouldbepopularwithmotoristswhocomplainthatthecurrentpaymentsystemisunfriendly:thetollforaday’stravelmustbepaidmanually--onlinebyphoneorinashop--bymidnightwithsteepfinesleviedonforgetfuldrivers.Moreprecisedetectionalsoallowsformoreprecisioninpolicyandroad-pricingenthusiastsseeradicalpossibilitiesahead.TfLsaysitisconsideringusingthenewtechnologytochargedriverseachtimetheycrossthezoneboundaryuptoadailymaximuminsteadofpayingonceforanentireday’stravel.Thatwouldbecheaperfordriverswhomakefewtripsintothezonealthoughdriverswhospendalongtimetrundlingaroundwithoutleavingtherebycausingthemostcongestionwouldgetofflightlytoo.Furtherrefinementsmaybepossible.Thecurrentsystemhascuttrafficmostdrasticallyinthemiddleofthedaywhencongestionisatitslowest.Demandforroadspacewouldbettermatchsupplyifchargeswerevariable--highatthebusiesttimesofdayandlowinquietperiods.Suchatime-sensitivevariable-chargingschemeusingatag-and-beaconsystemwasendorsedlastyearbyBobKileytheTfL’sbosswhoalsosaidthathewantedtoextendthecongestionchargetootherpartsofLondon.ThatwouldbecontroversialandMr.Kiley’sunderlingswerequicktoinsistthathismusingswerenotofficialpolicy.ButtheoriginalschemewascontroversialtooyetKenLivingstoneLondon’smayoranditsbiggestbackerwasre-electedafterintroducingit.Itwouldbeashameiftimiditytookholdnow.WhichofthefollowingstatementsistrueaboutTfL
当总供给曲线为正斜率单位原材料的实际成本增加时总供给曲线会移向
CouldHIVthevirusthatcausesAIDSbeweakeningTheresultsofastudyconductedinBelgiumattheInstituteofTropicalMedicineinAntwerpseemtosuggestthatinonecorneroftheworlditmightbe.ThereportpublishedinthelatestissueofAIDSaspecialistjournalconcludesthatHIV’sabilitytoreplicateknowntechnicallyasitsvirulencemayhavedecreasedsincethestartofthepandemic.KevinAdentheleadauthorofthepaperstressesthatthestudyisbasedonasmallsetofsamplesanddoesnotprovethatHIV’svirulenceisattenuatingaroundtheworld.Howeveritdoesoffernewinsightsintotheevolutionofthedisease.Dr.Arienlookedat24bloodsamplescollectedfromuntreatedpatientsattendinganHIV/AIDSclinicinAntwerp.Adozenofthesesamplesweretakenbetween1986and1989;theother12werecollectedbetween2002and2003.Firstheanalyzedthesamplestofindtheirviralloadthenumberofvirusparticlespercubiccentimeterandthesubtypeofvirusinvolved.InEuropeandNorthAmericathepredominantsubtypeisB;insub-SaharanAfricawheretheepidemicisatitsworstthepredominantsubtypeisC.MostofDr.Arien’ssampleswereofsubtypeB.Havingdonethisanalysishepairedthesamplesoffforaseriesofreplicativeduels.Eachsamplefromtheearlierserieswasmatchedwiththemostsimilaronefromthelaterseriesandtheywereplacedinidenticalcellculturestoseewhichwouldmultiplythemost.Theresultwasthat75%ofthevirusesfrom2002-03werelessvirulentthanapparentlysimilarcounterpartsfrom1986-89--astatisticallysignificantobservation.Dr.Arien’scautionissensibleatleastuntilsomeonereplicatestheworkelsewhere.Buthisconclusionisnotnecessarilysurprising.Suchviralattenuationasitisknownisonewaythatvaccinesareproduced.Whatcausesattenuationinwildvirusesthoughisamatterofspeculation.DrArienbelievesthatinthiscasetheattenuationcouldbetheresultofwhathecallsserialgeneticbottlenecksduringtransmissionfromhosttohost.Theseacttoreducethegeneticdiversityandthusthereplicativefitnessofthevirus.GeneticdiversityisknowntobeanimportantcomponentofHIV’svirulence.Butwhatmightcausethebottlenecksisstillunclear.AsecondreasonforcautionbesidesthesmallsizeofthestudyisasGeoffreyGarnettaprofessorofmicroparasiteepidemiologyatImperialCollegeLondonpointsoutthattheabilityofavirustoinfectcellsinatest-tubeisnotthesameasitsabilitytocausediseaseanddeathinahumanhost.NeverthelessDrAden’sresultisintriguingandsurelyworthfollowingupinalargerpieceofresearch.Whichisthebesttitleforthetext
以下关于远期外汇交易外汇期货交易和外汇期权交易的说法正确的是
股票当前的价格是100元以该价格作为执行价格的看涨期权和看跌期权的价格分别是7元和3元如果买入看涨期权卖出看跌期权再购入到期日价值为100元的无风险债券则我们就复制了该股票的价值特征可以叫做合成股票试问无风险债券的投资成本是多少如果偏离了这个价格市场会发生怎样的套利行为
平价债券.XYZ的修正久期为6下面哪句关于这种债券的论述是正确的
对比其他市场结构说明不能建立一般的寡头模型的原因
DespitethedoubtsanddespitecomplaintsfromshopownersLondon’scongestioncharge--introducedinFebruary2003--hasmanagedtoeasethegridlockinthecitycentre.Trafficisdownby18%jamsby30%.Thescheme’sbiggestweaknessisthatitiscrude:driverspay£8$14toenterthezonebetween7amand6:30pmregardlessofhowcongestedtheroadsareorhowlongtheystay.Soroad-pricingfansarewatchingtrialsbyTransportforLondonTfLofanewdetectionsystemcalledtag-and-beaconwithinterest.UndersuchaschemeusedinSingaporeandonsomeEuropeanroadscarsarefittedwithelectronictagsthatarereadbyroadsidemasts.IfthetrialissuccessfulTfLsaysthatthecitycouldswitchtothesystemoncethecontracttorunthecongestionchargeisre-letin2009.Currentlycamerasareusedtoreadlicenseplatesandtrackmotorists.Theyarenotalwaysreliable:anindividualcameraidentifiesonlyaround70%ofcars.Mostdrivengetphotographedmorethanoncewhichbooststhesystem’seffectivenesstoover95%butthatstillleavesseveralthousandvehiclesperdaywhosedetailsmustbelaboriouslycheckedbyhand.Tag-and-beacontechnologyismuchmoreaccuratewithanidentificationrateofover99%.TfLsaysthetrialispartlydesignedtoseewhetherthenewsystemcouldallowdriverstopaychargesbydirectdebit.Thatwouldbepopularwithmotoristswhocomplainthatthecurrentpaymentsystemisunfriendly:thetollforaday’stravelmustbepaidmanually--onlinebyphoneorinashop--bymidnightwithsteepfinesleviedonforgetfuldrivers.Moreprecisedetectionalsoallowsformoreprecisioninpolicyandroad-pricingenthusiastsseeradicalpossibilitiesahead.TfLsaysitisconsideringusingthenewtechnologytochargedriverseachtimetheycrossthezoneboundaryuptoadailymaximuminsteadofpayingonceforanentireday’stravel.Thatwouldbecheaperfordriverswhomakefewtripsintothezonealthoughdriverswhospendalongtimetrundlingaroundwithoutleavingtherebycausingthemostcongestionwouldgetofflightlytoo.Furtherrefinementsmaybepossible.Thecurrentsystemhascuttrafficmostdrasticallyinthemiddleofthedaywhencongestionisatitslowest.Demandforroadspacewouldbettermatchsupplyifchargeswerevariable--highatthebusiesttimesofdayandlowinquietperiods.Suchatime-sensitivevariable-chargingschemeusingatag-and-beaconsystemwasendorsedlastyearbyBobKileytheTfL’sbosswhoalsosaidthathewantedtoextendthecongestionchargetootherpartsofLondon.ThatwouldbecontroversialandMr.Kiley’sunderlingswerequicktoinsistthathismusingswerenotofficialpolicy.ButtheoriginalschemewascontroversialtooyetKenLivingstoneLondon’smayoranditsbiggestbackerwasre-electedafterintroducingit.Itwouldbeashameiftimiditytookholdnow.Thetag-and-beaconsystem
Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassical.In1worldduringthefifteenthcenturytheterm"reading"2meantreadingaloud.Onlyduringthenineteenthcenturydidsilentreadingbecomecommonplace.Oneshouldbewaryhoweverof3thatsilentreadingcameaboutsimplybecausereadingaloudisan4toothers.Examinationoffactorsrelatedtothe5developmentofsilentreadingrevealsthatitbecametheusualmodeofreadingformostadultreadingtasksmainlybecausethetasksthemselveschangedin6. Thelastcenturysawasteadygradualincreasein7andthusinthenumberofreaders.Asreadersincreasedthenumberofpotentiallisteners8andthustherewassome9intheneedtoreadaloud.Asreadingforthebenefitoflistenersgrewlesscommonsocametheflourishingofreadingasa10activityinsuchpublicplacesaslibrariesrailwaycarriagesandofficeswherereadingaloudwould11distractiontootherreaders. Towardstheendofthecenturytherewasstill12argumentoverwhetherbooksshouldbeusedforinformationortreated13andoverwhetherthereadingofmaterialsuchasnewspaperswasinsomeway14weakening.Indeedthisargumentstillremainswithusineducation.15itsvirtuestheoldsharedliteracyculturehadgoneandwas16bytheprintedmassmediaontheonehandandbybooksandperiodicalsfora17readershipontheother. Bytheendofthecenturystudentswerebeingrecommendedtoadoptattitudestobooksandtouseskillsinreadingthemwhichwereinappropriate18notimpossiblefortheoralreader.Thesocialculturalandtechnologicalchangesinthecenturyhadgreatly19whattheterm"reading"20. Readthefollowingtext.Choosethebestwordsforeachnumberedblankandmark[A][B][C]or[D]onANSWERSHEET1.15
Agrowingnumberofwomenarerisingtothetop--andbeginningtochangethecultureoftheworkplace.Thisshouldbeaseasonofcelebration.Afterallbymanymeasuresthere’sneverbeenabettertimetobeawoman.InplaceslikeScandinaviaandBritainathirdormoreofallcorporatemanagersarenowwomen.ThenumberoffemaleexecutivedirectorsofFISE100companiesnearlydoubledfrom2000to2004.LatinAmericahasseena50percentjumpinthenumberofwomenpoliticiansinthelastdecade.Japanvoted26newfemaleparliamentariansintoofficethisyear.Ofcoursethejewelintheequal-opportunitycrownwasthisfall’selectionofAngelaMerkel--oncenicknamedtheGirlbyHelmutKohl--toGermany’shighestoffice.Butasalwaysstatisticstellamultifacetedstory.Sureit’snolongerananomalytohaveafemaleCEO--buttherearestillonly17femaleexecutivedirectorsinthelargestFTSE100companies.IntheEUParliamentonly23outof162membersarefemale.InBritainstudiesshowthatwomenhaveneverbeenmoredissatisfiedwiththeworkplace.Nowonder:theEUpaygapbetweenmenandwomenshrankonlyonepointinthelastcoupleofyearsto17.5percent.SowheredoesallthisleaveusWithsomebigchallengesthatrequiremorefemaleleadershiptosolve.Atsomemajorcompanies--includingShellandBritishTelecom--womenarecombatingtheold-boys’clubatmospherebystartingtheirownnetworkslinkingtopfemaleleaderswithup-and-comerstheycanmentor.Laborflexibilityisalsoontheagenda;inpartsofEuropetopfemalelegislatorshavefoughttogiveemployeeswithchildrenorelderlyparentstherighttoaskforadjustablehours.Perhapsmostimportantthereisanincreasinglyvibrantdebatearoundwork-lifebalance.Studyafterstudyshowsthatitisaworkingwoman’ssecondfull-timejob--ascaregiver--thatmakesitmostdifficultforhertostayonthecareerladder.Whileextrabenefitsandlongermaternityleavecanhelptheyaren’tacompletesolution.Clearlysomeout-of-the-boxthinkingisrequired.Andthat’swherewomencomein.IncountrieslikeCameroonBoliviaandMalaysiagreaternumbersofwomeninpublicofficehaveresultedinlessspendingonthemilitaryandmoreonhealtheducationandinfrastructure.Norway’swoman-heavyParliamentrecentlypassedalawmandatingthat40percentofdirectorsoncorporateboardsbewomen.AndinGermanythearchetypaloutsider--awomanwhogrewuponthewrongsideoftheIronCurtain--willlikelytakethehelminacountrywithvirtuallynootherwomenintoppositionsofpower.NolongertheGirlbutpoisedtobecomethechancellorMerkelisasymbolofhowfarwomenhavecome--andtheworkthatremainstobedone.Itcanbeinferredfromthelastparagraphthat
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