TheUnitedStatesestimatesthataboutoneoutofevery10peopleontheplanettodayisatleast60yearsold.By2050it’sprojectedtobeoneoutof5.Thismeansthatnotonlywilltherebemoreoldpeoplebuttherewillberelative

　　TheUnitedStatesestimatesthataboutoneoutofevery10peopleontheplanettodayisatleast60yearsold.By2050it’sprojectedtobeoneoutof5.Thismeansthatnotonlywilltherebemoreoldpeoplebuttherewillberelativelyfeweryoungpeopletosupportthem.

　　ProfessorRichardLeeoftheUniversityofCaliforniaatBerkeleysaysthisagingoftheworldhasagreateffectoneconomics.“Populationagingincreasestheconcentrationofpopulationintheolderagesandthereforeitiscostly”hesaid.

　　Agingpopulationsconsume(消耗)moreandproduceless.Withmorepeoplelivinglongeritcouldgetexpensive.ButMr.Leesayswithcontinuingincreasesinworkerproductivityandsmartplanningitcanbemanageable.

　　Societieshavedifferentmethodsforcaringfortheelderlybuteachcarriesacost.Generallytherearethreetypesofsupport.Seniorscanliveoffthewealththeygainedwhentheywereyounger.Theycanrelyontheirfamilytotakecareofthemortheycanrelyonthegovernment.

　　Inindustrializednationsgovernmentscreatedpublicly-funded(公共资助的)supportsystems.TheseworkedrelativelywelluntilrecentyearswhenagingpopulationgrowthinplacesliketheUnitedStatesandWesternEuropebegantograduallyweakenthesystemsfinances.Thesenationsnowfacesometoughchoices.Mr.Leesaystheelderlyinsomeofthesecountriesmusteitherreceivelessmoneyretirelaterorincreasetaxestomakethesystemcontinuable.

　　Mostdevelopingnationshaven’tbuiltthistypeofgovernment-fundedsupportbuthaveinsteadreliedonfamiliestocarefortheirelderly.Thesenationsalsogenerallyhaveamuchyoungerpopulationwhichmeanstheirsituationisnotasurgentasmoredevelopednations.ButMr.Leesaysthatdoesn’tmeantheycanignoretheissue.“ThirdWorldcountriesshouldgiveverycarefulthoughttothisprocesstopopulationagingandhowitmayaffecttheireconomies—nowbeforepopulationagingevenbecomesanissue”heexplained.

　　32.“Aging”inthistextmeans .

　　A.therearemoreyoungpeoplethanoldpeople

　　B.anincreasingnumberofoldpeoplearedying

　　C.moreandmoreyoungpeoplearegrowingold

　　D.thepercentageofoldpeopleintheworldisincreasing

　　33.WhatisProfessorRi