号内单词的正确形式。Somethingsignificantishappeningtotheworldpopulation—itisaging.Themedian(中位数的)ageofanAmericanin195056(be)30—todayitis41andisexpected57(increase)to42by2050.ForJapan,the58(number)aremorestriking—22in1950,46todayand53in2050.In2015,onein12peoplearoundtheworldwereover65;by2050,itwillbeoneinsix.Thisagingofthepopulationisdriven59twofactors.Thefirstisdecliningbirthrates,pare)toyoungergenerations,andso,onaverage,es61(old)thanbefore.Thisis62(particular)trueintheUS.Thesecondreasonisthatpeoplearelivinglonger.ordingly.Peopletendtofocusonthefirstfactor.However,greaterattentionshould64(place)onlongevity(长寿).Itisn’tjustthatpeopleare,onaverage,livinglonger.It’salsothattheyareonaveragehealthier65moreproductiveforlonger.Therefore,theycanworkforlonger,consumemoreandingeneralbeaboosttotheeconomy.考点分布:
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