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脑的耗氧量占全身耗氧量的
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大脑耗氧量占全身耗氧量的_______
10%—15%。
15%—20%。
20%—25%。
25%—30%。
脑重量和氧耗量分别占体重和全身氧耗量的百分比下列哪项正确
2和10
1和10
2和20
1和20
3和30
脑的耗氧量与耗能量占全身的
30%
27%
24%
20%
脑重量和氧耗量分别占体重和全身氧耗量的百分比下列哪项正确
2和20
3和20
1和10
1和20
3和30
安静时脑耗氧量占全身耗氧量的多少
5%
10%
15%
20%
30%
安静时脑耗氧量占全身耗氧量的百分比是
10%
20%
30%
40%
50%
成人脑的耗氧量约占全身耗氧量的l/4婴幼儿脑耗氧量占全身耗氧量的
1/2
1/3
1/4
1/5
静息状态下脑平均耗氧量相当于全身的15%
有关脑循环特点的叙述错误的是
耗氧量大,耗氧量占全身氧耗的20%
血流量大,成人约为50ml/(100g·min)
神经细胞对缺氧极敏感但对低血糖不敏感
存在血-脑屏障,对物质有选择性通透性
脑内血液主要来自颈内动脉与椎动脉
脑耗氧量占总耗氧量的
11%
13%
15%
20%
23%
脑的耗氧量约占全身耗氧量的
20%
50%
30%
40%
70%
安静时脑耗氧量占全身耗氧量的
5%
10%
15%
20%
30%
有关脑循环特点的叙述错误的是
耗氧量大,耗氧量占全身氧耗的20%
血流量大,成人约为50ml/(100g·min)
神经细胞对缺氧极敏感但对低血糖不敏感
存在血-脑屏障,对物质有选择性通透性
脑内血液主要来自颈内动脉与椎动脉
正常成人的脑重约为占体重的流经脑组织的血液占每分心搏出量的脑组织耗氧量占全身耗氧量的
脑组织的耗氧占全身氧量的25%
小儿脑耗氧量在基础状态下占全身耗氧量的______而成人则占______缺氧对小儿的影响较成人更明显
脑的重量占全身体重的2%但其耗氧量与耗能量却占全身的.
20%
25%
30%
40%
脑组织的耗氧占全身氧量的5%
慢波睡眠时下列哪项是不正确的
机体耗氧量不变
机体耗氧量增加
脑耗氧量下降
脑耗氧量增加
脑是机体耗氧量最多的脏器所消耗的氧占全身氧需量的
10%
15%
20%
25%
30%
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Thedifferencesinrelativegrowthofvariousareasofscientificresearchhaveseveralcauses.71.Someofthesecausesarecompletelyreasonableresultsofsocialneeds.Othersarereasonableconsequencesofparticularadvancesinsciencebeingtosomeextentself-accelerating.Somehoweverarelessreasonableprocessesofdifferentgrowthinwhichpreconceptionsoftheformscientifictheoryoughttotakebypersonsinauthorityacttoalterthegrowthpatternofdifferentareas.Thisisanewproblemprobablynotyetunavoidable;butitisafrighteningtrend.72.ThistrendbeganduringtheSecondWorldWarwhenseveralgovernmentscametotheconclusionthatthespecificdemandsthatagovernmentwantstomakeofitsscientificestablishmentcannotgenerallybeforeseenindetail.Itcanbepredictedhoweverthatfromtimetotimequestionswillarisewhichwillrequirespecificscientificanswers.Itisthereforegenerallyvaluabletotreatthescientificestablishmentasaresourceormachinetobekeptinfunctionalorder.73.Thisseemsmostlyeffectivelydonebysupportingacertainamountofresearchnotrelatedtoimmediategoalsbutofpossibleconsequenceinthefuture. Thiskindofsupportlikeallgovernmentsupportrequiresdecisionsabouttheappropriaterecipientsoffunds.Decisionsbasedonutilityasopposedtolackofutilityarestraightforward.Butadecisionamongprojectsnoneofwhichhasimmediateutilityismoredifficult.Thegoalofthesupportingagenciesisthepraisableoneofsupportinggoodasopposedtobadsciencebutavaliddeterminationisdifficulttomake.Generallytheideaofgoodsciencetendstobecomeconfusedwiththecapacityofthefieldinquestiontogenerateaneleganttheory.74.Howevertheworldissomadethatelegantsystemsareinprincipleunabletodealwithsomeoftheworld’’smorefascinatinganddelightfulaspects.75.Newformsofthoughtaswellasnewsubjectsforthoughtmustariseinthefutureastheyhaveinthepastgivingrisetonewstandardsofelegance.
Comparisonsweredrawnbetweenthedevelopmentoftelevisioninthe20thcenturyandthediffusionofprintinginthe15thand16thcenturies.Yetmuchhadhappened________Aswasdiscussedbeforeitwasnot______the19thcenturythatthenewspaperbecamethedominantpre-electronic______followinginthewakeofthepamphletandthebookandinthe________oftheperiodical.Itwasduringthesametimethatthecommunicationsrevolution________upbeginningwithtransporttherailwayandleading________throughthetelegraphthetelephoneradioandmotionpictures________the20th-centuryworldofthemotorcarandtheairplane.Noteveryoneseesthatprocessin________Itisimportanttodoso. Itisgenerallyrecognized________thattheintroductionofthecomputerintheearly20thcentury________bytheinventionoftheintegratedcircuitduringthe1960sradicallychangedtheprocess________itsimpactonthemediawasnotimmediately________Astimewentbycomputersbecamesmallerandmorepowerfulandtheybecamepersonaltooaswellas________withdisplaybecomingsharperandstorage________increasing.Theywerethoughtoflikepeople________generationswiththedistancebetweengenerationsmuch________. Itwaswithinthecomputeragethattheterminformationsocietybegantobewidelyusedtodescribethe________withinwhichwenowlive.Thecommunicationsrevolutionhas________bothworkandleisureandhowwethinkandfeelbothaboutplaceandtimebuttherehavebeen________viewsaboutitseconomicpoliticalsocialandculturalimplications.Benefitshavebeenweighed________harmfuloutcomes.Andgeneralizationshaveproveddifficult.
Thedifferencesinrelativegrowthofvariousareasofscientificresearchhaveseveralcauses.71.Someofthesecausesarecompletelyreasonableresultsofsocialneeds.Othersarereasonableconsequencesofparticularadvancesinsciencebeingtosomeextentself-accelerating.Somehoweverarelessreasonableprocessesofdifferentgrowthinwhichpreconceptionsoftheformscientifictheoryoughttotakebypersonsinauthorityacttoalterthegrowthpatternofdifferentareas.Thisisanewproblemprobablynotyetunavoidable;butitisafrighteningtrend.72.ThistrendbeganduringtheSecondWorldWarwhenseveralgovernmentscametotheconclusionthatthespecificdemandsthatagovernmentwantstomakeofitsscientificestablishmentcannotgenerallybeforeseenindetail.Itcanbepredictedhoweverthatfromtimetotimequestionswillarisewhichwillrequirespecificscientificanswers.Itisthereforegenerallyvaluabletotreatthescientificestablishmentasaresourceormachinetobekeptinfunctionalorder.73.Thisseemsmostlyeffectivelydonebysupportingacertainamountofresearchnotrelatedtoimmediategoalsbutofpossibleconsequenceinthefuture. Thiskindofsupportlikeallgovernmentsupportrequiresdecisionsabouttheappropriaterecipientsoffunds.Decisionsbasedonutilityasopposedtolackofutilityarestraightforward.Butadecisionamongprojectsnoneofwhichhasimmediateutilityismoredifficult.Thegoalofthesupportingagenciesisthepraisableoneofsupportinggoodasopposedtobadsciencebutavaliddeterminationisdifficulttomake.Generallytheideaofgoodsciencetendstobecomeconfusedwiththecapacityofthefieldinquestiontogenerateaneleganttheory.74.Howevertheworldissomadethatelegantsystemsareinprincipleunabletodealwithsomeoftheworld’’smorefascinatinganddelightfulaspects.75.Newformsofthoughtaswellasnewsubjectsforthoughtmustariseinthefutureastheyhaveinthepastgivingrisetonewstandardsofelegance.
Comparisonsweredrawnbetweenthedevelopmentoftelevisioninthe20thcenturyandthediffusionofprintinginthe15thand16thcenturies.Yetmuchhadhappened________Aswasdiscussedbeforeitwasnot______the19thcenturythatthenewspaperbecamethedominantpre-electronic______followinginthewakeofthepamphletandthebookandinthe________oftheperiodical.Itwasduringthesametimethatthecommunicationsrevolution________upbeginningwithtransporttherailwayandleading________throughthetelegraphthetelephoneradioandmotionpictures________the20th-centuryworldofthemotorcarandtheairplane.Noteveryoneseesthatprocessin________Itisimportanttodoso. Itisgenerallyrecognized________thattheintroductionofthecomputerintheearly20thcentury________bytheinventionoftheintegratedcircuitduringthe1960sradicallychangedtheprocess________itsimpactonthemediawasnotimmediately________Astimewentbycomputersbecamesmallerandmorepowerfulandtheybecamepersonaltooaswellas________withdisplaybecomingsharperandstorage________increasing.Theywerethoughtoflikepeople________generationswiththedistancebetweengenerationsmuch________. Itwaswithinthecomputeragethattheterminformationsocietybegantobewidelyusedtodescribethe________withinwhichwenowlive.Thecommunicationsrevolutionhas________bothworkandleisureandhowwethinkandfeelbothaboutplaceandtimebuttherehavebeen________viewsaboutitseconomicpoliticalsocialandculturalimplications.Benefitshavebeenweighed________harmfuloutcomes.Andgeneralizationshaveproveddifficult.
InspiteofrisingconcernintheNortheastandCanadaAdministrationspokesmenhaverepeatedlyinsistedthatnothingcouldreallybedoneaboutacidrainandtheindustry-producedsulfuremissionsuntilallthescientificfactswerein.Suddenlylastweekhoweverfactscamerainingdownineffectmakingfurtherscientificdebateonwhatmainlycausestheproblemallbutirrelevant. WhatbroughtaboutthedownpourwasastudycommissionedbyPresidentialScienceAdviser.Thespokesmenplainlycalledforremedialactionevenifsometechnicalquestionsaboutacidrainwerestillunanswered.Ifwetaketheconservativepointofviewthatwemustwaituntilthescientificknowledgeisdefinitivesaidthespokesmantheaccumulateddepositionanddamagedenvironmentmayreachthepointof’’irreversibility’’. Whenitrainsitpours.NextcameastudyfromtheNationalResearchCouncil.Itsdefinitiveconclusion:reducingemissionsofsulfurdioxidefromcoal-burningpowerplantsandfactoriessuchastheseintheMidwestwouldinfactsignificantlyreducetheacidityinrainsnowandotherprecipitation降水thatiswidelybelievedtobeworseningthelifefromfresh-waterlakesandforestsintheNortheastandCanada.Thespokesmandidnotrecommendanyspecificaction. ApairofremedialmeasuresarealreadytakenbeforeCongress.ASenatecommitteerecentlyapprovedabillthatwouldrequirereductionoverthenextdecadeofsulfur-dioxideemissionsby10milliontonsintheStatesborderingontheeastoftheMississippi.AtoughermeasurewasintroducedintheHouseorderingthe50largestsulfurpollutersintheU.S.tocutemissionssubstantially.ToeasetheEasterncoalminingindustrywhichfearsaswitchtolow-sulfurWesterncoalthebillrequirestheinstallationofexpensivescrubbersdevicesforremovingsulfurfromthesmokeratherthananorderthatforbidshigh-sulfurfuel.StillthelegislationisbeingvigorouslyopposedbythecoalindustryandutilitiesespeciallyintheMid-westwhereheavyindustriesarebattlingtosurvive.InasurveyalsoreleasedlastweektheEdisonElectricInstituteanindustrygroupgravelypredictedthatelectricityratescouldriseasmuchas50%iftheemission-controllegislationpassed. GovernmentstudiesdisputethesefiguresbutCongresshasbeensuspendedonacid-rainmeasures.Nowasaresultoftheacademystudysupportersofthebillsaremoreoptimistic.Neverthelessamajorpoliticalbattleisshapingup. Thetwostudiesmentionedinthetextclearlystatedthat
LateVictorianandmodernideasofculturearealwaysinsomesenseattributedtoMatthewArnoldwholargelythroughhisCultureandAnarchy1869placedthewordatthecenterofdebatesaboutthegoalsofintellectuallifeandhumanisticsociety.Arnolddefinedcultureasthepursuitoftotalperfectionbymeansofgettingtoknowonallmatterswhichmostconcernusthebestwhichhasbeenthoughtandsaidintheworld.ItwasArnold’’shopethatthroughthisknowledgewecanturnafreshandfreethoughtuponourstocknotionsandhabits.AlthoughArnold’’sthinkingaboutculturehelpedtodefinethepurposesoftheliberalartscurriculuminthecenturyfollowingthepublicationofCulturethreeconcreteformsofdisagreementwithArnold’’sviewshavehadconsiderableimpactoftheirown. ThefirstcanbeseenasprotestingArnold’’sfearfuldestinationofanarchyasculture’’senemy.Thisdivisionseemstosetupsimplyonemoreversionoftheoldstrugglebetweenaprivilegedpowerstructureandradicalchallengestoitsauthority.Arnoldcertainlytriedtodefinethearch-thelawfulorderofvalue-againstwhathesawasthean-archexistentialistdemocracyyethehimselfwasannoyedinhissoulbytheblindprideofthereactionarypowersinhisworld. AnotherformofoppositionsawArnold’’scultureasanabsurdperpetuationofclassicalandliterarylearningoutlookandprivilegesinaworldwheresciencehadbecomethenewarchandfromwhichanyreallyneworderofthinkingmustdevelop.AtthecenterofthetwoculturesdebatewerethegoalsoftheformalcurriculumintheeducationalsystemwhichisalwaystakentobetheprincipalvehiclethroughwhichArnoldiancultureoperates.HoweverArnoldhimselfhadviewedcultureasenactingitslifeinamuchmorebroadlyconceivedsetofinstitutions. TodayhoweverArnoldiancultureissustainedifindirectlybymulticulturalismamovementaimedlargelyatgainingrecognitionforvoicesandvisionsthatArnoldianculturehasimplicitlysuppressed.Atthelevelofeducationalpracticethemulticulturalistsareinterestedinlesseningthearbitraryauthoritythathighcultureexercisesoverthecurriculumwhilebringingintoplaytheprinciplethatwemustlearnwhatisrepresentativeforwehaveoveremphasizedwhatisexceptional.Themulticulturalists’’conflictwithArnoldianculturehasclearsimilaritiestotheradicalcritique;yetmulticulturalismaffirmsArnoldbyreturningusmorespecificallytoatensioninherentintheideaofcultureratherthantotheculture-anarchydivision. ThesocialcriticsdefendersofscienceandmulticulturalistsinsistthatArnold’’scultureissimplyadevicefororderingusabout.Insteaditisdesignedtoregisterthegatheringofideologicalcloudsonthehorizon.ThereisnoutopianmotiveinArnold’’scelebrationofperfection.TheideaofperfectionmatteredtoArnoldastheonlybackgroundagainstwhichwecouldformajustimageofouractualcircumstancesjustaswecanconceivefinersunsetsandunheardmelodies.ThiscapacitywhichallhumanspossessArnoldmadethefoundationandauthorityofculture. Arnoldwouldmostlikelydisagreewiththestatementthat
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
Whilediseaseispresentpriortosocialorganizationcommunallifecreatesspecialhazards.Whiletheorganizationofsocietycanreducethedangersofdiseasetradeandurbanizationwiththeirconsequentproblemsofsanitationandpollutioncanalsoaggravatesuchdangers.Eveninthemid-twentiethcenturyduringthebriefcalmbetweenthepolioandAIDSepidemicsepidemichealthrisksassociatedwithcarcinogenscancer-producingsubstancesfrompollutedairthreatenedtheindustrializedworld. Totheeconomisteffortstocombattheserisksareatleastpartiallypublicgoods.Thebenefitsfrompublicgoodsareindivisibleamongbeneficiaries.Asoleprivatepurchaserofhealthcarewouldgiveothersinsocietyafreeridewithrespecttothebenefitsobtained.Tomarkettheoristssuchgoodsarelawfulobjectsofgovernmentalinterventioninthemarket.Whilethetheoryofpublicgoodshelpsexplainaspectsofpublichealthlawandassistsinfittingitintomoderneconomictheoryitomitsacriticalpoint.Illhealthisnotamerebyproductofeconomicactivitybutaninevitableoccurrenceofhumanexistence.Asaresultwhereverthereishumansocietytherewillbepublichealth.Everysocietyhastofacetherisksofdisease.Andbecauseitmusteverysocietysearchestomakediseasecomprehensiblewithinthecontextofthesociety’’sownparticularculturereligionorscience.Inthissensehealthcareispublicnotonlybecauseitsbenefitsareindivisibleandthreatstoitarisefromfactorsoutsideoftheindividualbutalsobecausecommunallifegivesindividualstheculturalcontextinwhichtounderstandit. Governmentstypicallyhaveassumedanactiverolewithrespecttohealthcareactingasiftheirrolewereobligatory.Howgovernmentshavefulfilledthatdutyhasvariedthroughouttimeandacrosssocietiesaccordingnotonlytothewealthandscientificsophisticationoftheculturebutalsotoitsfundamentalvalues--becausehealthisdefinedinpartbyacommunity’’sbeliefsystempublichealthmeasureswillnecessarilyreflectculturalnormsandvalues. ThosewhocriticizetheUnitedStatesgovernmenttodayfornotprovidinghealthcaretoallcitizensequatetheprovisionofhealthcarewithinsurancecoverageforthecostsofmedicalexpenses.Bythisstandardseventeenthandeighteenth-centuryAmericalackedanysignificantconceptionofpublichealthlaw.Howeverdespitethegeneralpaucityscarcityofbureaucraticorganizationinpre-industrialAmericathevastextentofhealthregulationandprovisionstandsoutasremarkable.Ofcoursethepublicroleintheprotectionandregulationofeighteenth-centuryhealthwascarriedoutinwaysquitedifferentfromthosetoday.Organizationsresponsibleforhealthregulationwerelessstablethanmodernbureaucraciestendingtoappearincrisesandfadeawayinperiodsofcalm.Thefocuswasonepidemicswhichwereseenasunnaturalandwarrantingaresponsenottothemanyprevalentandchronicconditionswhichwereacceptedaspartandparcelofdailylife.Additionallyandnotsurprisinglyreligiousinfluencewassignificantespeciallyintheseventeenthcentury.Finallyinanerawhichlackedsharpdivisionsbetweenprivateandgovernmentalbodiesmanypublicresponsibilitieswerecarriedoutbywhatwewouldnowconsiderprivateassociations.Neverthelesstheextentofpublichealthregulationlongbeforethedawnofthewelfarestateisremarkableandsuggeststhatthefoundinggeneration’’sassumptionsabouttherelationshipbetweengovernmentandhealthweremorecomplexthancommonlyassumed. WhichofthefollowingfindstheLEASTsupportinthetext
Rumorhasitthatmorethan20booksoncreationism/evolutionareinthepublisher’’spipelines.Afewhavealreadyappeared.Thegoalofallwillbetotrytoexplaintoaconfusedandoftenunenlightenedcitizenrythattherearenottwoequallyvalidscientifictheoriesfortheoriginandevolutionofuniverseandlife.Cosmologygeologyandbiologyhaveprovidedaconsistentunifiedandconstantlyimprovingaccountofwhathappened.Scientificcreationismwhichisbeingpushedbysomeforequaltimeintheclassroomswheneverthescientificaccountsofevolutionaregivenisbasedonreligionnotscience.Virtuallyallscientistsandthemajorityofnonfundamentalistreligiousleadershavecometoregardscientificcreationismasbadscienceandbadreligion. ThefirstfourchaptersofKitcher’’sbookgiveaverybriefintroductiontoevolution.Atappropriateplacesheintroducesthecriticismsofthecreationistsandprovidesanswers.Inthelastthreechaptershetakesoffhisglovesandgivesthecreationistsagoodbeating.Hedescribestheirprogrammesandtacticsandforthoseunfamiliarwiththewaysofcreationiststheextentoftheirdeceptionanddistortionmaycomeasanunpleasantsurprise.WhentheirbasicmotivationisreligiousonemighthaveexpectedmoreChristianbehavior. Kitcherisaphilosopherandthismayaccountinpartforthecharityandeffectivenessofhisarguments.Thenonspecialistwillbeabletoobtainatleastanotionofthesortsofdataandargumentthatsupportevolutionarytheory.Thefinalchaptersonthecreationistswillbeextremelycleartoall.OnthedustjacketofthisfinebookStephenJayGouldsays:Thisbookstandsforreasonitself.Andsoitdoes―andallwouldbewellwerereasontheonlyjudgeinthecreationism/evolutiondebate. Thispassageappearstobeadigestof_________________.
Youboughtadressonthewebandfounditfaulty.Writealettertothesellerinwhichyoushould 1statethetimeandwayofyourpurchase 2listitsfaultsand 3askforrefund. Youshouldwriteabout100wordsonANSWERSHEET2.Donotsignyourownnameattheendoftheletter.UseLiMinginstead.Youdonotneedtowritetheaddress.10points
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