- 问题详情:AccordingtoanewUSstudy,coupleswhoexpecttheirchildrentohelpcarefortheminoldageshouldhopetheyhavedaughtersbecausetheyarelikelytobetwiceasattentiveoverall. TheresearchbyAngelinaGrigoryeva,asociologistatPrincetonUniversity,foundthat,whilewom...
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