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SeenfromthisperspectivetheswingingsinglescomplexesthatattractedsomuchgossipafewyearslaterareanelaborationontheSunCityconcept—theclusteringtogetherofpeopleofsimilaragesoroutlooks.
TextC Theconceptofobtainingfreshwaterfromicebergsthataretowedtopopulatedareasandaridregionsoftheworldwasoncetreatedasajokemoreappropriatetocartoonsthanreallife.Butnowitisbeingconsideredquiteseriouslybymanynationsespeciallysincescientistshavewarnedthatthehumanracewilloutgrowitsfreshwatersupplyfasterthanitrunsoutoffood. Glaciersareapossiblesourceoffreshwaterthathavebeenoverlookeduntilrecently.Three-quartersoftheEarth’sfreshwatersupplyisstilltiedupinglacialiceareservoirofuntappedfreshwatersoimmensethatitcouldsustainalltheriversoftheworldfor1000years.Floatingontheoceanseveryyearare7659trillionmetrictonsoficeencasedin10000icebergsthatbreakawayfromthepolaricecapsmorethanninetypercentofthemfromAntarctica. Hugeglaciersthatstretchovertheshallowcontinentalshelfgivebirthtoicebergsthroughouttheyear.Icebergsarenotlikeseaicewhichisformedwhentheseaitselffreezes;rathertheyareformedentirelyonlandbreakingoffwhenglaciersspreadoverthesea.Astheydriftawayfromthepolarregionicebergssometimesmovemysteriouslyinadirectionoppositetothewindpulledbysubsurfacecurrents.Becausetheymeltmoreslowlythansmallerpiecesoficeicebergshavebeenknowntodriftasfarnorthas35degreessouthoftheequatorintheAtlanticOcean.Tocorralthemandsteerthemtopartsoftheworldwheretheyareneededwouldnotbetoodifficult. Thedifficultyarisesinothertechnicalmatterssuchasthepreventionofrapidmeltinginwarmerclimatesandthefunnelingoffreshwatertoshoreingreatvolume.Buteveniftheicebergslosthalfoftheirvolumeintowingthewatertheycouldprovidewouldbefarcheaperthanthatproducedbydesalinationorremovingsaltfromwater. Whatisthemaintopicofthepassage
写出平衡态T12钢在室温时的组织组成物并计算各组织组成物的质量百分数
TextB InrecentyearsAmericansocietyhasbecomeincreasinglydependentonitsuniversitiestofindsolutionstoitsmajorproblems.Itistheuniversitiesthathavebeenchargedwiththeprincipalresponsibilityfordevelopingtheexpertisetoplacemenonthemoon;fordealingwithoururbanproblemsandwithourdeterioratingenvironment;fordevelopingthemeanstofeedtheworld’srapidlyincreasingpopulation.Theeffortinvolvedinmeetingthesedemandspresentsitsownproblems.Inadditionthisconcentrationonthecreationofnewknowledgesignificantlyimpingesontheuniversities’effortstoperformtheirotherprincipalfunctionsthetransmissionandinterpretationofknowledge----theimpartingoftheheritageofthepastandthepreparingofthenextgenerationtocarryitforward. Withregardtothisperhapstheirmosttraditionallysanctionedtaskcollegesanduniversitiestodayfindthemselvesinaseriousbindgenerally.OntheonehandthereistheAmericancommitmententeredintoespeciallysinceWorldWarIItoprovidehighereducationforallyoungpeoplewhocanprofitfromit.Theresultofthecommitmenthasbeenadramaticriseinenrollmentsinouruniversitiescoupledwitharadicalshiftfromtheprivatetothepublicsectorofhighereducation.Ontheotherhandthereareseriousandcontinuinglimitationsontheresourcesavailableforhighereducation. Whilehighereducationhasbecomeagreatgrowthindustryitisalsosimultaneouslyatremendousdrainontheresourcesofthenation.Withthevastincreaseinenrollmentandtheshiftinprioritiesawayfromeducationinstateandfederalbudgetsthereisinmostofourpublicinstitutionsasignificantdecreaseinpercapitaoutlayfortheirstudents.Onecrucialaspectofthisdrainonresourcesliesinthepersistentshortageoftrainedfacultywhichhasledinturntoadecliningstandardofcompetenceininstruction. Intensifyingthesedifficultiesisasindicatedabovetheconcernwithresearchwithitscompetingclaimsonresourcesandtheattentionofthefaculty.Inadditionthereisastrongtendencyfortheinstitutions’organizationandfunctioningtoconformtothedemandsofresearchratherthanthoseofteaching. AccordingtothepassageoneofthecausesforthedifficultiesofAmericanhighereducationisthat_________.
立方形晶体中的位错环ABCDA如图25-2所示AB段和CD段平行于Z轴AD段和BC段平行于X轴位错环的柏氏矢量b平行于Y轴AD=d刃位错的应力场σe和螺位错的应力场σs公式如下 在外应力τxy作用下单位长度各段位错所受的力各是多大在什么方向
TEXTA Intoday’ssocietywearenowseeingmorechildrenundertheageoftwelvedevelopingeatingdisorders.Itisestimatedthat40%ofnineyearoldshavealreadydietedandwearebeginningtoseefourandfiveyearoldsexpressingtheneedtodiet.It’sashamethatchildrensoyoungarebeingrobbedoftheirchildhoods.WhyisitthatsomanyyoungchildrenarebecomingobsessedwithdietingandtheirweightIfeelthefamilyenvironmenthasalottodowithitalongwiththefactthatchildrenareconstantlybeingexposedtothemessagesocietygivesabouttheimportanceofbeingthin. Childrenraisedinadysfunctionalfamilyareatahigherriskfordevelopinganeatingdisorder.Inahomewherephysicalorsexualabuseistakingplacethechildmayturntoaneatingdisordertogainasenseofcontrol.Iftheycan’tcontrolwhatishappeningtotheirbodiesduringtheabusetheycancontroltheirfoodintakeortheirweight.Selfimposedstarvationmayalsobetheirwayoftryingtodisappearsotheynolongerhavetosufferthroughtheabuse. Childrenmayalsodevelopeatingdisordersasawayofdealingwiththemanyemotionsthattheyfeelespeciallyiftheyareraisedinahomethatdoesnotallowfeelingstobeexpressed.Childrenwhoarecompulsiveeatersareusuallyusingfoodtohelpthemdealwithfeelingsofangersadnesshurtlonelinessabandonmentfearandpain.Ifchildrenarenotallowedtoexpresstheiremotionstheymaybecomeemotionaleaters.Alsoifparentsaretooinvolvedintheirownproblemsthechildmayturntofoodforcomfort. Childrenareatariskfordevelopinganeatingdisorderiftheparentsthemselvesaretoopreoccupiedwithappearanceandweight.Iftheparentsareconstantlydietingandexpressingdisliketowardstheirownbodiesthechildwillreceivethemessagethatappearanceisveryimportant.Insomefamiliestheparentsmistakebabyfatforactualfatandmaytrytoimposeadietonthechild.Notonlyisthatnotrightit’scruel. Asparentsyouneedtosetagoodexampleforyourchildrenwhichmeansthatyouyourselfshouldbeinvolvedinhealthyeatingpatterns.Anotherthingtorememberaboutchildrenisthattheyeatwhentheyarehungryandtheystopwhentheyarefull.Neverforceachildtoeatiftheydon’twantto.Toomanyfamiliesstillforcechildrentoremainatthetableuntiltheyhaveeateneverythingontheirplate.Doingthatcouldcausethechildtohatemealtimesanddevelopanunhealthyattitudetowardsfood. Exerciseisalsoanimportantpartofeveryone’slifeandweneedtohelpourchildrenbecomeinvolvedinphysicalactivitywhichmeanstheparentsthemselvesshouldparticipateinhealthyexercise.Helpthechildtofindactivitiestheyenjoyandactivitiesthewholefamilycanenjoy.Theyshouldbetaughtthatphysicalactivityisimportantinmaintainingastrongandhealthybodybuttheyshouldnotbegiventhemessagethatexerciseisimportantinmaintainingaslimfigure. Whatkindofmessagedoesthesocietygivetothechildrenwhoarebecomingobsessedwithdietingandtheirweight
IsMoreGrowthReallyBetter Anumberofwritershaveraisedquestionsaboutthedesirabilityoffastereconomicgrowthasanendinitselfatleastinthewealthierindustrializedcountries.Yetfastergrowthdoesmeanmorewealthandtomostpeoplethedesirabilityofwealthisbeyondquestion.I’vebeenrichandI’vebeenpoor—andIcantellyourichisbetteranotedstagepersonalityissaidtohavetoldaninterviewerandmostpeopleseemtohavethesameattitudeabouttheeconomyasawhole.TothosewhoholdthisbeliefahealthyeconomyisonethatiscapableofturningoutvastquantitiesofshoesfoodcarsandTVsets.Aneconomywhosecapacitytoprovideallthesethingsisnotexpandingissaidtohavesuccumbedtothediseaseofstagnation.
TextC Theconceptofobtainingfreshwaterfromicebergsthataretowedtopopulatedareasandaridregionsoftheworldwasoncetreatedasajokemoreappropriatetocartoonsthanreallife.Butnowitisbeingconsideredquiteseriouslybymanynationsespeciallysincescientistshavewarnedthatthehumanracewilloutgrowitsfreshwatersupplyfasterthanitrunsoutoffood. Glaciersareapossiblesourceoffreshwaterthathavebeenoverlookeduntilrecently.Three-quartersoftheEarth’sfreshwatersupplyisstilltiedupinglacialiceareservoirofuntappedfreshwatersoimmensethatitcouldsustainalltheriversoftheworldfor1000years.Floatingontheoceanseveryyearare7659trillionmetrictonsoficeencasedin10000icebergsthatbreakawayfromthepolaricecapsmorethanninetypercentofthemfromAntarctica. Hugeglaciersthatstretchovertheshallowcontinentalshelfgivebirthtoicebergsthroughouttheyear.Icebergsarenotlikeseaicewhichisformedwhentheseaitselffreezes;rathertheyareformedentirelyonlandbreakingoffwhenglaciersspreadoverthesea.Astheydriftawayfromthepolarregionicebergssometimesmovemysteriouslyinadirectionoppositetothewindpulledbysubsurfacecurrents.Becausetheymeltmoreslowlythansmallerpiecesoficeicebergshavebeenknowntodriftasfarnorthas35degreessouthoftheequatorintheAtlanticOcean.Tocorralthemandsteerthemtopartsoftheworldwheretheyareneededwouldnotbetoodifficult. Thedifficultyarisesinothertechnicalmatterssuchasthepreventionofrapidmeltinginwarmerclimatesandthefunnelingoffreshwatertoshoreingreatvolume.Buteveniftheicebergslosthalfoftheirvolumeintowingthewatertheycouldprovidewouldbefarcheaperthanthatproducedbydesalinationorremovingsaltfromwater. Withwhichofthefollowingideaswouldtheauthorbelikelytoagree
TextD TheecosystemsoftheEarthprovideanarrayoffreepublicservicesthatareessentialthesupportofcivilizations.Theymaintainthequalityoftheatmosphereprovidefoodfromtheseamanufactureandreplenishsoilsrecyclewastesandnutrientscontroltheoverwhelmingmajorityofcroppestsanddiseasevectorsandsoon.Peoplehavenoideahowtotakeovertheseactivitiessatisfactorily.Theydoknowhoweverthatthetheoryonceadvancedinthenineteenthcentury---thattheproductivityofthelandcanbeindefinitelyincreasedbytheapplicationofcapitallaborandscience---iswrong.Historyhasshownthatoncethenaturallife-supportsystemsofacivilizationhavebeensufficientlydamagedtheycannotusuallyberepaired.TheancientdeforestationandovergrazingoftheMediterraneanregionisafamousexample.Andtodayaglobalcivilizationisruiningtheglobalenvironment. Thewordarrayinthefirstsentenceisclosesetinmeaningto
A-B二元合金相图如图25-4所示在固相不扩散液相完全混合条件下水平放置的质量分数wC=20%的A-B二元合金熔液从左至右定向凝固成长为L的横截面均匀的合金棒 画出合金棒中组织沿棒长分布及合金棒中B组元浓度沿棒长分布曲线示意图
TEXTA Intoday’ssocietywearenowseeingmorechildrenundertheageoftwelvedevelopingeatingdisorders.Itisestimatedthat40%ofnineyearoldshavealreadydietedandwearebeginningtoseefourandfiveyearoldsexpressingtheneedtodiet.It’sashamethatchildrensoyoungarebeingrobbedoftheirchildhoods.WhyisitthatsomanyyoungchildrenarebecomingobsessedwithdietingandtheirweightIfeelthefamilyenvironmenthasalottodowithitalongwiththefactthatchildrenareconstantlybeingexposedtothemessagesocietygivesabouttheimportanceofbeingthin. Childrenraisedinadysfunctionalfamilyareatahigherriskfordevelopinganeatingdisorder.Inahomewherephysicalorsexualabuseistakingplacethechildmayturntoaneatingdisordertogainasenseofcontrol.Iftheycan’tcontrolwhatishappeningtotheirbodiesduringtheabusetheycancontroltheirfoodintakeortheirweight.Selfimposedstarvationmayalsobetheirwayoftryingtodisappearsotheynolongerhavetosufferthroughtheabuse. Childrenmayalsodevelopeatingdisordersasawayofdealingwiththemanyemotionsthattheyfeelespeciallyiftheyareraisedinahomethatdoesnotallowfeelingstobeexpressed.Childrenwhoarecompulsiveeatersareusuallyusingfoodtohelpthemdealwithfeelingsofangersadnesshurtlonelinessabandonmentfearandpain.Ifchildrenarenotallowedtoexpresstheiremotionstheymaybecomeemotionaleaters.Alsoifparentsaretooinvolvedintheirownproblemsthechildmayturntofoodforcomfort. Childrenareatariskfordevelopinganeatingdisorderiftheparentsthemselvesaretoopreoccupiedwithappearanceandweight.Iftheparentsareconstantlydietingandexpressingdisliketowardstheirownbodiesthechildwillreceivethemessagethatappearanceisveryimportant.Insomefamiliestheparentsmistakebabyfatforactualfatandmaytrytoimposeadietonthechild.Notonlyisthatnotrightit’scruel. Asparentsyouneedtosetagoodexampleforyourchildrenwhichmeansthatyouyourselfshouldbeinvolvedinhealthyeatingpatterns.Anotherthingtorememberaboutchildrenisthattheyeatwhentheyarehungryandtheystopwhentheyarefull.Neverforceachildtoeatiftheydon’twantto.Toomanyfamiliesstillforcechildrentoremainatthetableuntiltheyhaveeateneverythingontheirplate.Doingthatcouldcausethechildtohatemealtimesanddevelopanunhealthyattitudetowardsfood. Exerciseisalsoanimportantpartofeveryone’slifeandweneedtohelpourchildrenbecomeinvolvedinphysicalactivitywhichmeanstheparentsthemselvesshouldparticipateinhealthyexercise.Helpthechildtofindactivitiestheyenjoyandactivitiesthewholefamilycanenjoy.Theyshouldbetaughtthatphysicalactivityisimportantinmaintainingastrongandhealthybodybuttheyshouldnotbegiventhemessagethatexerciseisimportantinmaintainingaslimfigure. Whichofthefollowingisthesuggestionthattheauthorgivestotheparents
如图25-1a所示边长为a的立方晶胞中ABCD晶面及AC晶向是晶体的一个滑移系 当分别在晶体的[123]方向拉伸时其中哪一个方向的拉应力能使ABCD晶面及AC晶向组成的滑移系首先开动
图25-3所示为四种不同碳含量的碳钢的室温平衡组织试估计它们各自的碳质量百分数wC
如图25-1a所示边长为a的立方晶胞中ABCD晶面及AC晶向是晶体的一个滑移系 该晶体为何种立方结构
DoyouagreeordisagreewiththefollowingstatementThereisnothingthatyoungpeoplecanteacholderpeople.Usespecificreasonsandexamplestosupportyourposition. Inthefirstpartofyourarticleyoushouldstateclearlyyourmainargumentandinthesecondpartyoushouldsupportyourargumentwithappropriatedetails.Inthelastpartyoushouldbringwhatyouhavewrittentoanaturalconclusionorasummary. Youshouldsupplyatitleforyourarticle. Markswillbeawardedforcontentorganizationgrammarandappropriateness.Failuretofollowingtheaboveinstructionsmayresultinalossofmarks.
Howtoreformthecountry’seducationalsystemhasbasicallybecomeasocialandpoliticalproblem.inessence
Thepowertoproducegreatartisveryoftenthoughbynomeansalwaysassociatedwithatemperamentalunhappinesssogreatthatbutforthejoywhichtheartistderivesfromhisworkhewouldbedriventosuicide.
TextC Theconceptofobtainingfreshwaterfromicebergsthataretowedtopopulatedareasandaridregionsoftheworldwasoncetreatedasajokemoreappropriatetocartoonsthanreallife.Butnowitisbeingconsideredquiteseriouslybymanynationsespeciallysincescientistshavewarnedthatthehumanracewilloutgrowitsfreshwatersupplyfasterthanitrunsoutoffood. Glaciersareapossiblesourceoffreshwaterthathavebeenoverlookeduntilrecently.Three-quartersoftheEarth’sfreshwatersupplyisstilltiedupinglacialiceareservoirofuntappedfreshwatersoimmensethatitcouldsustainalltheriversoftheworldfor1000years.Floatingontheoceanseveryyearare7659trillionmetrictonsoficeencasedin10000icebergsthatbreakawayfromthepolaricecapsmorethanninetypercentofthemfromAntarctica. Hugeglaciersthatstretchovertheshallowcontinentalshelfgivebirthtoicebergsthroughouttheyear.Icebergsarenotlikeseaicewhichisformedwhentheseaitselffreezes;rathertheyareformedentirelyonlandbreakingoffwhenglaciersspreadoverthesea.Astheydriftawayfromthepolarregionicebergssometimesmovemysteriouslyinadirectionoppositetothewindpulledbysubsurfacecurrents.Becausetheymeltmoreslowlythansmallerpiecesoficeicebergshavebeenknowntodriftasfarnorthas35degreessouthoftheequatorintheAtlanticOcean.Tocorralthemandsteerthemtopartsoftheworldwheretheyareneededwouldnotbetoodifficult. Thedifficultyarisesinothertechnicalmatterssuchasthepreventionofrapidmeltinginwarmerclimatesandthefunnelingoffreshwatertoshoreingreatvolume.Buteveniftheicebergslosthalfoftheirvolumeintowingthewatertheycouldprovidewouldbefarcheaperthanthatproducedbydesalinationorremovingsaltfromwater. Accordingtotheauthormostoftheworld’sfreshwateristobefoundin
A-B二元合金相图如图25-4所示在固相不扩散液相完全混合条件下水平放置的质量分数wC=20%的A-B二元合金熔液从左至右定向凝固成长为L的横截面均匀的合金棒 该棒单相α固溶体段是否会生长成树枝晶为什么
TextB InrecentyearsAmericansocietyhasbecomeincreasinglydependentonitsuniversitiestofindsolutionstoitsmajorproblems.Itistheuniversitiesthathavebeenchargedwiththeprincipalresponsibilityfordevelopingtheexpertisetoplacemenonthemoon;fordealingwithoururbanproblemsandwithourdeterioratingenvironment;fordevelopingthemeanstofeedtheworld’srapidlyincreasingpopulation.Theeffortinvolvedinmeetingthesedemandspresentsitsownproblems.Inadditionthisconcentrationonthecreationofnewknowledgesignificantlyimpingesontheuniversities’effortstoperformtheirotherprincipalfunctionsthetransmissionandinterpretationofknowledge----theimpartingoftheheritageofthepastandthepreparingofthenextgenerationtocarryitforward. Withregardtothisperhapstheirmosttraditionallysanctionedtaskcollegesanduniversitiestodayfindthemselvesinaseriousbindgenerally.OntheonehandthereistheAmericancommitmententeredintoespeciallysinceWorldWarIItoprovidehighereducationforallyoungpeoplewhocanprofitfromit.Theresultofthecommitmenthasbeenadramaticriseinenrollmentsinouruniversitiescoupledwitharadicalshiftfromtheprivatetothepublicsectorofhighereducation.Ontheotherhandthereareseriousandcontinuinglimitationsontheresourcesavailableforhighereducation. Whilehighereducationhasbecomeagreatgrowthindustryitisalsosimultaneouslyatremendousdrainontheresourcesofthenation.Withthevastincreaseinenrollmentandtheshiftinprioritiesawayfromeducationinstateandfederalbudgetsthereisinmostofourpublicinstitutionsasignificantdecreaseinpercapitaoutlayfortheirstudents.Onecrucialaspectofthisdrainonresourcesliesinthepersistentshortageoftrainedfacultywhichhasledinturntoadecliningstandardofcompetenceininstruction. Intensifyingthesedifficultiesisasindicatedabovetheconcernwithresearchwithitscompetingclaimsonresourcesandtheattentionofthefaculty.Inadditionthereisastrongtendencyfortheinstitutions’organizationandfunctioningtoconformtothedemandsofresearchratherthanthoseofteaching. Aseriousoutcomebroughtoutbytheshortageofresourcesisthat_________.
如图25-1a所示边长为a的立方晶胞中ABCD晶面及AC晶向是晶体的一个滑移系 当ABCD晶面及AC晶向组成的滑移系首先开动后若晶体发生交滑移写出可能的交滑移系
W-Cr-Ni三元合金800℃等温截面图如图25-5所示 确定图中B合金的成分写出它在该温度时的相组成物在图中标出各组成相的成分点并计算各相的质量百分数用字母列式表示即可
立方形晶体中的位错环ABCDA如图25-2所示AB段和CD段平行于Z轴AD段和BC段平行于X轴位错环的柏氏矢量b平行于Y轴AD=d刃位错的应力场σe和螺位错的应力场σs公式如下 指出各段位错线是什么性质的位错如为螺位错指出其是左旋或右旋如为刃位错指出其半原子面
TEXTA Intoday’ssocietywearenowseeingmorechildrenundertheageoftwelvedevelopingeatingdisorders.Itisestimatedthat40%ofnineyearoldshavealreadydietedandwearebeginningtoseefourandfiveyearoldsexpressingtheneedtodiet.It’sashamethatchildrensoyoungarebeingrobbedoftheirchildhoods.WhyisitthatsomanyyoungchildrenarebecomingobsessedwithdietingandtheirweightIfeelthefamilyenvironmenthasalottodowithitalongwiththefactthatchildrenareconstantlybeingexposedtothemessagesocietygivesabouttheimportanceofbeingthin. Childrenraisedinadysfunctionalfamilyareatahigherriskfordevelopinganeatingdisorder.Inahomewherephysicalorsexualabuseistakingplacethechildmayturntoaneatingdisordertogainasenseofcontrol.Iftheycan’tcontrolwhatishappeningtotheirbodiesduringtheabusetheycancontroltheirfoodintakeortheirweight.Selfimposedstarvationmayalsobetheirwayoftryingtodisappearsotheynolongerhavetosufferthroughtheabuse. Childrenmayalsodevelopeatingdisordersasawayofdealingwiththemanyemotionsthattheyfeelespeciallyiftheyareraisedinahomethatdoesnotallowfeelingstobeexpressed.Childrenwhoarecompulsiveeatersareusuallyusingfoodtohelpthemdealwithfeelingsofangersadnesshurtlonelinessabandonmentfearandpain.Ifchildrenarenotallowedtoexpresstheiremotionstheymaybecomeemotionaleaters.Alsoifparentsaretooinvolvedintheirownproblemsthechildmayturntofoodforcomfort. Childrenareatariskfordevelopinganeatingdisorderiftheparentsthemselvesaretoopreoccupiedwithappearanceandweight.Iftheparentsareconstantlydietingandexpressingdisliketowardstheirownbodiesthechildwillreceivethemessagethatappearanceisveryimportant.Insomefamiliestheparentsmistakebabyfatforactualfatandmaytrytoimposeadietonthechild.Notonlyisthatnotrightit’scruel. Asparentsyouneedtosetagoodexampleforyourchildrenwhichmeansthatyouyourselfshouldbeinvolvedinhealthyeatingpatterns.Anotherthingtorememberaboutchildrenisthattheyeatwhentheyarehungryandtheystopwhentheyarefull.Neverforceachildtoeatiftheydon’twantto.Toomanyfamiliesstillforcechildrentoremainatthetableuntiltheyhaveeateneverythingontheirplate.Doingthatcouldcausethechildtohatemealtimesanddevelopanunhealthyattitudetowardsfood. Exerciseisalsoanimportantpartofeveryone’slifeandweneedtohelpourchildrenbecomeinvolvedinphysicalactivitywhichmeanstheparentsthemselvesshouldparticipateinhealthyexercise.Helpthechildtofindactivitiestheyenjoyandactivitiesthewholefamilycanenjoy.Theyshouldbetaughtthatphysicalactivityisimportantinmaintainingastrongandhealthybodybuttheyshouldnotbegiventhemessagethatexerciseisimportantinmaintainingaslimfigure. Thepassagemainlytalksabout__________.
TextD TheecosystemsoftheEarthprovideanarrayoffreepublicservicesthatareessentialthesupportofcivilizations.Theymaintainthequalityoftheatmosphereprovidefoodfromtheseamanufactureandreplenishsoilsrecyclewastesandnutrientscontroltheoverwhelmingmajorityofcroppestsanddiseasevectorsandsoon.Peoplehavenoideahowtotakeovertheseactivitiessatisfactorily.Theydoknowhoweverthatthetheoryonceadvancedinthenineteenthcentury---thattheproductivityofthelandcanbeindefinitelyincreasedbytheapplicationofcapitallaborandscience---iswrong.Historyhasshownthatoncethenaturallife-supportsystemsofacivilizationhavebeensufficientlydamagedtheycannotusuallyberepaired.TheancientdeforestationandovergrazingoftheMediterraneanregionisafamousexample.Andtodayaglobalcivilizationisruiningtheglobalenvironment. WhichofthefollowingcouldNOTbeincludedunderthefreepublicserviceslistedinthesecondsentence:
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