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需求价格点弹性适用于______。
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通常情况下需求价格点弹性适用于
价格与需求量变动较小
价格与供给量变动较小
价格与需求量变动较大
价格与供给量变动较大
撇脂定价策略适用于需求价格弹性较大的商品
需求价格弹性系数分为弧弹性和点弹性弧弹性适用于
价格和需求量变动较大的场合（正确选项）
价格和需求量变动较小的场合
价格和供给量变动较大的场合
价格和供给量变动较小的场合
由于弧弹性能表现需求曲线两点之间的弹性所以它适用于价格和 需求量变动较大的场合
需求价格弹性系数分为弧弹性和点弹性弧弹性适用于
价格和需求量变动较大的场合
价格和需求量变动较小的场合
价格和供给量变动较大的场合
价格和供给量变动较小的场合
需求价格点弹性适用于
价格和需求量变动较大的场合
价格和需求量变动较小的场合
价格和供给量变动较大的场合
价格和供给量变动较大的场合
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Mostspeakersaresurprisingtolearnthatpeoplewho1._____speakonlyonelanguageformaminorityoftheworld’spopulationthatmostpeoplefunctionintwoormorelanguages.2._____Whilefewpeoplearetrulybalancedbilingualsorpolyglotswhofeelequalcomfortablewithalllanguages3._____thefactisthatmostoftheworld’spopulationfunctionsinmorethanlanguage.Giventhisit’ssomewhatsurprising4._____thatsomuchattentionispaidtotheEnglish-speakingworldtothematteroflearningaadditionallanguage.Ifsomany5._____peopleseemtodoitsoeasilythenjustwhatistheproblemThesimplestansweristhattherereallyisn’tone.Givingampleopportunityandtimemostpeoplecanlearnas6._____manylanguagesastheywantorneedto.ButasteacherschargedwiththeresponsibilityofaddingEnglishtothelinguisticinventoryofnon-English-speakingchildrenwemustbeconcernedpreciselythesematters—providingample7._____andeffectiveopportunityandusingtimeaseffectivelyaspossible.Thischapterwilllookbrieflyhowchildrenbecomebilingual.8._____Firstwe’llexaminetheconditionsleadtobilingualism9._____inpreschoolersthenwe’llturnourattentiontolanguagelearningintheclassroom.Infocusingonthedifferencesbetweenlanguageacquisitionathomeandatschoolwe’llseethatthere’sthepotentialforconflictfromchildren’sinformallanguage10._____learninginthehomeandthemoreformalexperienceoftheschool.
BythetimeyougraduateweinAustraliaforoneyear
AlthoughwealreadyknowagreatdealaboutinfluenzaandalthoughtheWorldHealthOrganizationisconstantlycollectingdetailedinformationfromitschainofinfluenzareferencelaboratoriesthroughouttheworlditisextremelydifficultforepidemiologists流行病专家whostudyinfectiousdiseasetopredictwhenandwherethenextfluepidemicwilloccurandhowsevereitwillbe. TherearethreekindsofinfluenzavirusknownasABandC.InfluenzaCvirusisrelativelystableandcausesmildinfectionsthatdonotspreadfarthroughthepopulation.TheAandBtypesareunstableandareresponsiblefortheepidemicsthatcausefrequentconcern.Followinganyvirusattackthehumanbodybuildsupantibodieswhichconferimmunitytothatstrainofvirusbutaviruswiththecapacitytochangeitscharacterisabletoby-passthisprotection.VariabilityislessdevelopedintheinfluenzaBviruswhichaffectsonlyhumanbeings.AninfluenzaBvirusmaycauseawidespreadepidemicbutwillhavelittleeffectifintroducedintothesamecommunitysoonafterwardssincenearlyeveryonewillhavebuiltupantibodiesandwillbeimmune.TheinfluenzaAviruswhichaffectsanimalsalsoisextremelyunstableandisresponsibleforsomeoftheworstoutbreaksofthediseasesuchastheunparalleledpandemicorworldepidemicof1918-1919whenabouthalftheworld’spopulationwereinfectedandabouttwentymillionpeoplediedsomefrompneumoniacausedbythevirusitselfandsomefromsecondarycomplications并发症causedbybacteria. Accuratepredictionisdifficultbecauseofthecomplicationofthefactors.Aparticularvirusmayberelatedtoonetowhichsomeofthepopulationhavepartialinvolvedimmunity.Theextenttowhichitwillspreadwilldependonfactorssuchasitsownstrengthorvirulencetheeasewithwhichitcanbetransmittedandthestrengthoftheoppositionitencounters.Scientistshoweverhaveareliablegeneralpictureoftheworldsituation.InfluenzaAattacksusinwaveseverytwoorthreeyearswhileinfluenzaBwhichtravelsmoreslowlylaunchesitsmainassaultseverythreetosixyears.Theoutbreaksvaryfromisolatedcasestoepidemicsinvolvingatenthormoreofthepopulation.Wemayconfidentlyprophesythatsoonerorlaterlargenumbersofpeoplewillbefeelingtheunpleasanteffectsofsomekindofinfluenzavirus. Whichofthefollowingisthemostappropriatetitleforthepassage
FewarticlesinthenewspapersmoreattentionthanthatreportingthemurdercasewithO.J.Simpsoninvolved
Followinganyvirusattackthehumanbodybuildsupantibodieswhichconferimmunitytothatstrainofvirusbutaviruswiththecapacitytochangeitscharacterisabletoby-passthisprotection.______
AlthoughwealreadyknowagreatdealaboutinfluenzaandalthoughtheWorldHealthOrganizationisconstantlycollectingdetailedinformationfromitschainofinfluenzareferencelaboratoriesthroughouttheworlditisextremelydifficultforepidemiologists流行病专家whostudyinfectiousdiseasetopredictwhenandwherethenextfluepidemicwilloccurandhowsevereitwillbe. TherearethreekindsofinfluenzavirusknownasABandC.InfluenzaCvirusisrelativelystableandcausesmildinfectionsthatdonotspreadfarthroughthepopulation.TheAandBtypesareunstableandareresponsiblefortheepidemicsthatcausefrequentconcern.Followinganyvirusattackthehumanbodybuildsupantibodieswhichconferimmunitytothatstrainofvirusbutaviruswiththecapacitytochangeitscharacterisabletoby-passthisprotection.VariabilityislessdevelopedintheinfluenzaBviruswhichaffectsonlyhumanbeings.AninfluenzaBvirusmaycauseawidespreadepidemicbutwillhavelittleeffectifintroducedintothesamecommunitysoonafterwardssincenearlyeveryonewillhavebuiltupantibodiesandwillbeimmune.TheinfluenzaAviruswhichaffectsanimalsalsoisextremelyunstableandisresponsibleforsomeoftheworstoutbreaksofthediseasesuchastheunparalleledpandemicorworldepidemicof1918-1919whenabouthalftheworld’spopulationwereinfectedandabouttwentymillionpeoplediedsomefrompneumoniacausedbythevirusitselfandsomefromsecondarycomplications并发症causedbybacteria. Accuratepredictionisdifficultbecauseofthecomplicationofthefactors.Aparticularvirusmayberelatedtoonetowhichsomeofthepopulationhavepartialinvolvedimmunity.Theextenttowhichitwillspreadwilldependonfactorssuchasitsownstrengthorvirulencetheeasewithwhichitcanbetransmittedandthestrengthoftheoppositionitencounters.Scientistshoweverhaveareliablegeneralpictureoftheworldsituation.InfluenzaAattacksusinwaveseverytwoorthreeyearswhileinfluenzaBwhichtravelsmoreslowlylaunchesitsmainassaultseverythreetosixyears.Theoutbreaksvaryfromisolatedcasestoepidemicsinvolvingatenthormoreofthepopulation.Wemayconfidentlyprophesythatsoonerorlaterlargenumbersofpeoplewillbefeelingtheunpleasanteffectsofsomekindofinfluenzavirus. Whatdoesthewordassaultintheeighthlineofthelastparagraphmean
It'snotsafetocarryvaluablesaroundhere.You'dbettertheminthehotelsafealongwithyourpassport
Mostspeakersaresurprisingtolearnthatpeoplewho1._____speakonlyonelanguageformaminorityoftheworld’spopulationthatmostpeoplefunctionintwoormorelanguages.2._____Whilefewpeoplearetrulybalancedbilingualsorpolyglotswhofeelequalcomfortablewithalllanguages3._____thefactisthatmostoftheworld’spopulationfunctionsinmorethanlanguage.Giventhisit’ssomewhatsurprising4._____thatsomuchattentionispaidtotheEnglish-speakingworldtothematteroflearningaadditionallanguage.Ifsomany5._____peopleseemtodoitsoeasilythenjustwhatistheproblemThesimplestansweristhattherereallyisn’tone.Givingampleopportunityandtimemostpeoplecanlearnas6._____manylanguagesastheywantorneedto.ButasteacherschargedwiththeresponsibilityofaddingEnglishtothelinguisticinventoryofnon-English-speakingchildrenwemustbeconcernedpreciselythesematters—providingample7._____andeffectiveopportunityandusingtimeaseffectivelyaspossible.Thischapterwilllookbrieflyhowchildrenbecomebilingual.8._____Firstwe’llexaminetheconditionsleadtobilingualism9._____inpreschoolersthenwe’llturnourattentiontolanguagelearningintheclassroom.Infocusingonthedifferencesbetweenlanguageacquisitionathomeandatschoolwe’llseethatthere’sthepotentialforconflictfromchildren’sinformallanguage10._____learninginthehomeandthemoreformalexperienceoftheschool.
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Mostspeakersaresurprisingtolearnthatpeoplewho1._____speakonlyonelanguageformaminorityoftheworld’spopulationthatmostpeoplefunctionintwoormorelanguages.2._____Whilefewpeoplearetrulybalancedbilingualsorpolyglotswhofeelequalcomfortablewithalllanguages3._____thefactisthatmostoftheworld’spopulationfunctionsinmorethanlanguage.Giventhisit’ssomewhatsurprising4._____thatsomuchattentionispaidtotheEnglish-speakingworldtothematteroflearningaadditionallanguage.Ifsomany5._____peopleseemtodoitsoeasilythenjustwhatistheproblemThesimplestansweristhattherereallyisn’tone.Givingampleopportunityandtimemostpeoplecanlearnas6._____manylanguagesastheywantorneedto.ButasteacherschargedwiththeresponsibilityofaddingEnglishtothelinguisticinventoryofnon-English-speakingchildrenwemustbeconcernedpreciselythesematters—providingample7._____andeffectiveopportunityandusingtimeaseffectivelyaspossible.Thischapterwilllookbrieflyhowchildrenbecomebilingual.8._____Firstwe’llexaminetheconditionsleadtobilingualism9._____inpreschoolersthenwe’llturnourattentiontolanguagelearningintheclassroom.Infocusingonthedifferencesbetweenlanguageacquisitionathomeandatschoolwe’llseethatthere’sthepotentialforconflictfromchildren’sinformallanguage10._____learninginthehomeandthemoreformalexperienceoftheschool.
Thefinalexamsapproachedthestudentsbecamemoreandmorenervous
Morethanacenturyagotherelationshipbetweenglacialiceandtheamountofwaterintheoceanbasinswasfirstseen.Whenthegreaticesheetcoveredvastlandareasthesealevelwasloweredbecausethenormalreturnofwaterfromlandtotheoceanwasreduced.AsaresultthesealevelroseasIceAgeglaciersmeltedallowingthemeltedwaterstoflowintotheocean.Ifalltheglacialiceonthesurfaceoftheearthtodayshouldmeltthesealevelmightrisebymorethan150feet.Shorelinevariationsarealsoproducedthroughelevationordepressionoftheland.Duringtimesofglacierformationsthegreatweightoftheiceslowlydepressedtheearth’scrust.Removaloftheweightthroughglaciermeltingallowedtheslowreturnofthecrusttoitsformerposition.ChangesintheGreatIceclimatesfromcoolandwettowarmanddryproducedclimatechangesfarfromtheglaciatedarea.Forexampleattimesofcool-wetglacialclimateslevelsofinlandlakesroseincontrasttothedepressionofsealevel.Duringthewarm-dryinterglacialclimateslakelevelswerelowered.TheancientlakeBonnevillelargestoftheglaciallakesinWesternUnitedStatesoncecoveredmorethan20000squaremiles.Ithadamaximumdepthofmorethan1000feet.GreatSaltLakeinUtahistheshrunkenremnantofthisoncelargelake. AlthoughthefirsttimethatearlymanwalkedontheearthisuncertainheislargelyaproductoftheGreatIceAge.Presentinformationshowsthatduringthistimeheevolvedrapidlybothphysicallyandculturally.HismostprimitivetoolsandskeletalremainshavebeenfoundinsomeoftheoldestdepositscontemporarywiththeGreatIceAgeinAfricaAsiaandEurope.Theseareoftenassociatedwithremainsofextinctanimals.WiththedisappearanceofthegreaticesheetstheBronzeandIronAgeculturesevolved.Aboutthistimemanyanimalssuitedtocoolerclimatesdied. AlthoughmuchremainstobelearnedthestoryoftheGreatIceAgeisbeingunfoldedthroughtheeffortsofspecialistsinmanyfields.RecordingfieldobservationnewtheoriesandmethodsandworldwidestudiesofexistingglaciersarebringingaclearerunderstandingoftheGreatIceAge. Accordingtothearticlewhichofthefollowingwillinducethedepressionofsealevel
Normallyintropicalregionswherethesunisverystrongtheoceansalinityissomewhathigherthanitisinotherpartsoftheworldwherethereisnotasmuchevaporation.______
Morethanacenturyagotherelationshipbetweenglacialiceandtheamountofwaterintheoceanbasinswasfirstseen.Whenthegreaticesheetcoveredvastlandareasthesealevelwasloweredbecausethenormalreturnofwaterfromlandtotheoceanwasreduced.AsaresultthesealevelroseasIceAgeglaciersmeltedallowingthemeltedwaterstoflowintotheocean.Ifalltheglacialiceonthesurfaceoftheearthtodayshouldmeltthesealevelmightrisebymorethan150feet.Shorelinevariationsarealsoproducedthroughelevationordepressionoftheland.Duringtimesofglacierformationsthegreatweightoftheiceslowlydepressedtheearth’scrust.Removaloftheweightthroughglaciermeltingallowedtheslowreturnofthecrusttoitsformerposition.ChangesintheGreatIceclimatesfromcoolandwettowarmanddryproducedclimatechangesfarfromtheglaciatedarea.Forexampleattimesofcool-wetglacialclimateslevelsofinlandlakesroseincontrasttothedepressionofsealevel.Duringthewarm-dryinterglacialclimateslakelevelswerelowered.TheancientlakeBonnevillelargestoftheglaciallakesinWesternUnitedStatesoncecoveredmorethan20000squaremiles.Ithadamaximumdepthofmorethan1000feet.GreatSaltLakeinUtahistheshrunkenremnantofthisoncelargelake. AlthoughthefirsttimethatearlymanwalkedontheearthisuncertainheislargelyaproductoftheGreatIceAge.Presentinformationshowsthatduringthistimeheevolvedrapidlybothphysicallyandculturally.HismostprimitivetoolsandskeletalremainshavebeenfoundinsomeoftheoldestdepositscontemporarywiththeGreatIceAgeinAfricaAsiaandEurope.Theseareoftenassociatedwithremainsofextinctanimals.WiththedisappearanceofthegreaticesheetstheBronzeandIronAgeculturesevolved.Aboutthistimemanyanimalssuitedtocoolerclimatesdied. AlthoughmuchremainstobelearnedthestoryoftheGreatIceAgeisbeingunfoldedthroughtheeffortsofspecialistsinmanyfields.RecordingfieldobservationnewtheoriesandmethodsandworldwidestudiesofexistingglaciersarebringingaclearerunderstandingoftheGreatIceAge. Whichofthefollowingcanbelearnedaboutearlymanbasedontheinformationprovidedinthepassage
Thesalesdepartmenthassubmittedaoftheirannualsalesreporttotheboardofdirectors
Accordingtotheweathertomorrowwillbeovercastanddull
Mostspeakersaresurprisingtolearnthatpeoplewho1._____speakonlyonelanguageformaminorityoftheworld’spopulationthatmostpeoplefunctionintwoormorelanguages.2._____Whilefewpeoplearetrulybalancedbilingualsorpolyglotswhofeelequalcomfortablewithalllanguages3._____thefactisthatmostoftheworld’spopulationfunctionsinmorethanlanguage.Giventhisit’ssomewhatsurprising4._____thatsomuchattentionispaidtotheEnglish-speakingworldtothematteroflearningaadditionallanguage.Ifsomany5._____peopleseemtodoitsoeasilythenjustwhatistheproblemThesimplestansweristhattherereallyisn’tone.Givingampleopportunityandtimemostpeoplecanlearnas6._____manylanguagesastheywantorneedto.ButasteacherschargedwiththeresponsibilityofaddingEnglishtothelinguisticinventoryofnon-English-speakingchildrenwemustbeconcernedpreciselythesematters—providingample7._____andeffectiveopportunityandusingtimeaseffectivelyaspossible.Thischapterwilllookbrieflyhowchildrenbecomebilingual.8._____Firstwe’llexaminetheconditionsleadtobilingualism9._____inpreschoolersthenwe’llturnourattentiontolanguagelearningintheclassroom.Infocusingonthedifferencesbetweenlanguageacquisitionathomeandatschoolwe’llseethatthere’sthepotentialforconflictfromchildren’sinformallanguage10._____learninginthehomeandthemoreformalexperienceoftheschool.
Prolonginghumanlifehasincreasedthesizeofthehumanpopulation.Manypeoplealivetodaywouldhavediedofchildhooddiseasesiftheyhadbeenbornahundredyearsago.Becausemorepeoplelivelongertherearemorepeoplearoundatanygiventime.Infactitisadecreaseindeathratesnotanincreaseinbirthratesthathasledtothepopulationexplosion. Prolonginghumanlifehasalsoincreasedthedependencyload.Inallsocietiespeoplewhoaredisabledortooyoungortoooldtoworkaredependentontherestofsocietytoprovideforthem.Inhuntingandgatheringculturesoldpeoplewhocouldnotkeepupmightbeleftbehindtodie.Intimesoffamineinfantsmightbeallowedtodiebecausetheycouldnotsurviveiftheirparentsstarvedwhereasiftheparentssurvivedtheycouldhaveanotherchild.Inmostcontemporary当代的societiespeoplefeelamoralobligationtokeeppeoplealivewhethertheycanworkornot.Wehaveagreatmanypeopletodaywholivepasttheageatwhichtheywanttoworkorareabletowork;wealsohaveruleswhichrequirepeopletoretireatacertainage.Unlessthesepeoplewereabletosavemoneyfortheirretirementsomebodyelsemustsupportthem.IntheUnitedStatesmanyretiredpeopleliveonsocialsecuritycheckswhicharesolittlethattheymustliveinnearpoverty.Olderpeoplehavemoreillnessthanyoungormiddle-agedpeople;unlesstheyhavewealthorprivateorgovernmentinsurancetheymustoftengoonwelfareiftheyhaveaseriousillness. Whenolderpeoplebecomesenileortooweaktocareforthemselvestheycreategraveproblemsfortheirfamilies.Inthepastandinsometraditionalculturestheywouldbecaredforathomeuntiltheydied.Todaywithmostmembersofahouseholdworkingorinschoolthereisoftennooneathomewhocancareforasickorweakperson.Tomeetthisneedagreatmanynursinghomesandconvalescent康复的hospitalshavebeenbuilt.Theseareoftenprofit-makingorganizationsalthoughsomearesponsored赞助byreligiousandothernonprofitgroups.Whileafewoftheseinstitutionsaregoodmostofthemaresimplydumpinggroundsforthedyinginwhichcareisgivenbypoorlypaidoverworkedandunder-skilledpersonnel. Whatwasthecausetothepopulationgrowthaccordingtothepassage
Mostspeakersaresurprisingtolearnthatpeoplewho1._____speakonlyonelanguageformaminorityoftheworld’spopulationthatmostpeoplefunctionintwoormorelanguages.2._____Whilefewpeoplearetrulybalancedbilingualsorpolyglotswhofeelequalcomfortablewithalllanguages3._____thefactisthatmostoftheworld’spopulationfunctionsinmorethanlanguage.Giventhisit’ssomewhatsurprising4._____thatsomuchattentionispaidtotheEnglish-speakingworldtothematteroflearningaadditionallanguage.Ifsomany5._____peopleseemtodoitsoeasilythenjustwhatistheproblemThesimplestansweristhattherereallyisn’tone.Givingampleopportunityandtimemostpeoplecanlearnas6._____manylanguagesastheywantorneedto.ButasteacherschargedwiththeresponsibilityofaddingEnglishtothelinguisticinventoryofnon-English-speakingchildrenwemustbeconcernedpreciselythesematters—providingample7._____andeffectiveopportunityandusingtimeaseffectivelyaspossible.Thischapterwilllookbrieflyhowchildrenbecomebilingual.8._____Firstwe’llexaminetheconditionsleadtobilingualism9._____inpreschoolersthenwe’llturnourattentiontolanguagelearningintheclassroom.Infocusingonthedifferencesbetweenlanguageacquisitionathomeandatschoolwe’llseethatthere’sthepotentialforconflictfromchildren’sinformallanguage10._____learninginthehomeandthemoreformalexperienceoftheschool.
Theyleftfortheairportveryearlyinthemorningtrafficjam
Thisinformationdoesn'tshedanylighttheproblem
Thefactshesuppliedwerenotrelevantthecaseinquestion
AlthoughwealreadyknowagreatdealaboutinfluenzaandalthoughtheWorldHealthOrganizationisconstantlycollectingdetailedinformationfromitschainofinfluenzareferencelaboratoriesthroughouttheworlditisextremelydifficultforepidemiologists流行病专家whostudyinfectiousdiseasetopredictwhenandwherethenextfluepidemicwilloccurandhowsevereitwillbe. TherearethreekindsofinfluenzavirusknownasABandC.InfluenzaCvirusisrelativelystableandcausesmildinfectionsthatdonotspreadfarthroughthepopulation.TheAandBtypesareunstableandareresponsiblefortheepidemicsthatcausefrequentconcern.Followinganyvirusattackthehumanbodybuildsupantibodieswhichconferimmunitytothatstrainofvirusbutaviruswiththecapacitytochangeitscharacterisabletoby-passthisprotection.VariabilityislessdevelopedintheinfluenzaBviruswhichaffectsonlyhumanbeings.AninfluenzaBvirusmaycauseawidespreadepidemicbutwillhavelittleeffectifintroducedintothesamecommunitysoonafterwardssincenearlyeveryonewillhavebuiltupantibodiesandwillbeimmune.TheinfluenzaAviruswhichaffectsanimalsalsoisextremelyunstableandisresponsibleforsomeoftheworstoutbreaksofthediseasesuchastheunparalleledpandemicorworldepidemicof1918-1919whenabouthalftheworld’spopulationwereinfectedandabouttwentymillionpeoplediedsomefrompneumoniacausedbythevirusitselfandsomefromsecondarycomplications并发症causedbybacteria. Accuratepredictionisdifficultbecauseofthecomplicationofthefactors.Aparticularvirusmayberelatedtoonetowhichsomeofthepopulationhavepartialinvolvedimmunity.Theextenttowhichitwillspreadwilldependonfactorssuchasitsownstrengthorvirulencetheeasewithwhichitcanbetransmittedandthestrengthoftheoppositionitencounters.Scientistshoweverhaveareliablegeneralpictureoftheworldsituation.InfluenzaAattacksusinwaveseverytwoorthreeyearswhileinfluenzaBwhichtravelsmoreslowlylaunchesitsmainassaultseverythreetosixyears.Theoutbreaksvaryfromisolatedcasestoepidemicsinvolvingatenthormoreofthepopulation.Wemayconfidentlyprophesythatsoonerorlaterlargenumbersofpeoplewillbefeelingtheunpleasanteffectsofsomekindofinfluenzavirus. WhatdoestheauthorsayabouttheinfluenzaBvirus
Justasrelaxationisanimportantpartofourlivesstress
Ifthedoorwasnotforcedopenthattheburglarmusthavehadakey
Prolonginghumanlifehasincreasedthesizeofthehumanpopulation.Manypeoplealivetodaywouldhavediedofchildhooddiseasesiftheyhadbeenbornahundredyearsago.Becausemorepeoplelivelongertherearemorepeoplearoundatanygiventime.Infactitisadecreaseindeathratesnotanincreaseinbirthratesthathasledtothepopulationexplosion. Prolonginghumanlifehasalsoincreasedthedependencyload.Inallsocietiespeoplewhoaredisabledortooyoungortoooldtoworkaredependentontherestofsocietytoprovideforthem.Inhuntingandgatheringculturesoldpeoplewhocouldnotkeepupmightbeleftbehindtodie.Intimesoffamineinfantsmightbeallowedtodiebecausetheycouldnotsurviveiftheirparentsstarvedwhereasiftheparentssurvivedtheycouldhaveanotherchild.Inmostcontemporary当代的societiespeoplefeelamoralobligationtokeeppeoplealivewhethertheycanworkornot.Wehaveagreatmanypeopletodaywholivepasttheageatwhichtheywanttoworkorareabletowork;wealsohaveruleswhichrequirepeopletoretireatacertainage.Unlessthesepeoplewereabletosavemoneyfortheirretirementsomebodyelsemustsupportthem.IntheUnitedStatesmanyretiredpeopleliveonsocialsecuritycheckswhicharesolittlethattheymustliveinnearpoverty.Olderpeoplehavemoreillnessthanyoungormiddle-agedpeople;unlesstheyhavewealthorprivateorgovernmentinsurancetheymustoftengoonwelfareiftheyhaveaseriousillness. Whenolderpeoplebecomesenileortooweaktocareforthemselvestheycreategraveproblemsfortheirfamilies.Inthepastandinsometraditionalculturestheywouldbecaredforathomeuntiltheydied.Todaywithmostmembersofahouseholdworkingorinschoolthereisoftennooneathomewhocancareforasickorweakperson.Tomeetthisneedagreatmanynursinghomesandconvalescent康复的hospitalshavebeenbuilt.Theseareoftenprofit-makingorganizationsalthoughsomearesponsored赞助byreligiousandothernonprofitgroups.Whileafewoftheseinstitutionsaregoodmostofthemaresimplydumpinggroundsforthedyinginwhichcareisgivenbypoorlypaidoverworkedandunder-skilledpersonnel. Whatdoesthewordsenile’inthefirstlineofthelastparagraphmean
Olderpeoplehavemoreillnessthanyoungormiddle-agedpeople;unlesstheyhavewealthorprivateorgovernmentinsurancetheymustoftengoonwelfareiftheyhaveaseriousillness.______
Wecanmakeanexception
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