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   TheUnitedStatesestimatesthataboutoneoutofevery10peop...

  •    TheUnitedStatesestimatesthataboutoneoutofevery10peop...

  • 问题详情：   TheUnitedStatesestimatesthataboutoneoutofevery10peopleontheplanettodayisatleast60yearsold.By2050,it’sprojectedtobeoneoutof5.Thismeansthatnotonlywilltherebemoreoldpeople,buttherewillberelativelyfeweryoungpeopletosupportthem.ProfessorRic...
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