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设函数f(x)在[0，1]上连续，并设，试求．
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设函数fx=ln1+x﹣ln1﹣x则fx是
奇函数，且在（0，1）上是增函数
奇函数，且在（0，1）上是减函数
偶函数，且在（0，1）上是增函数
偶函数，且在（0，1）上是减函数
设函数fx在[01]上连续在01内可导且f1=0求证至少存在一点ξ∈01使得2ξ+1fξ+ξf’ξ=
设函数fx在[01]上连续在01内可导且f0f1＜0．求证存在ξ∈01使得ξf’ξ+4-ξ2fξ=0
设函数fx＝ln1＋x－ln1－x则fx是
奇函数，且在(0，1)上是增函数
奇函数，且在(0，1)上是减函数
偶函数，且在(0，1)上是增函数
偶函数，且在(0，1)上是减函数
设fx在[01]上连续且0≤fx≤1试证在[01]内至少存在一个ξ使fξ=ξ
设fx在[01]上连续在01内可导且f0=0f1=1试证Ⅰ存在ξ∈01使fξ=1-ξⅡ存在两个不同的
设随机变量X在区间01上随机地取值当X取到x0＜x＜1时Y在x1上随机地取值．试求ⅠXY的联合密度函
设函数fx在[01]上连续在01内可导且满足[*]证明至少存在一点ξ∈01使得f’ξ=1-ξ-1fξ
设函数fx在区间[01]上连续在01内可导且f0=f1证明对任何0＜C＜1存在ξη满足0＜ξ＜η＜1
设fx在[01]上连续在01内可导且f0=1f1=0．求证存在ξ∈01使[*]
设函数fx在闭区间[01]上连续在开区间01内可导且f0=f1=1[*]．求证对任何满足0＜k＜1的
设fx在区间[01]上连续在01内可导且f0=f1=0试证 存在[*]使fη=η
设函数则fx是
奇函数，且在(0,1)上是增函数
奇函数，且在(0,1)上是减函数
偶函数，且在(0,1)上是增函数
偶函数，且在(0,1)上是减函数
设函数fx在[01]上连续在01内可导且f0f1＜0．求证存在ζ∈01使得ζf’ζ+4-ζ2fζ=0
设fx在[01]上连续且[*]证明存在一个ξ∈01使得[*]．
设函数fx在[01]上连续在01内可导且f1=0．求证至少存在一点ξ∈01使得2ξ+1fξ+ξf’ξ
设fx与gx在区间01上都是正值的连续函数．且有相同的单调性．试讨论的大小关系．
设函数fx在[01]上连续01内可导且证明在01内存在一点使f’C=0
设fx在[01]上连续．证明至少存在一个ξ∈01使得[*]
设函数fx在[01]上连续在01内可导且f0=00＜f’x＜10＜x＜1．求证[*]
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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
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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]onANSWERSHEET1.3
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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]onANSWERSHEET1.9
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
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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]onANSWERSHEET1.17
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
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下列哪一项不是经济的重要特征
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
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