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• 问题详情：Aprofessortoldhisstudentstogointothecityslum(贫民窟)tostudythelifeof200boys．Heaskedthemtowritereportsabouteachboy’slifeandfuture．Everyoneofthestudentswrote，“Hedoesn’thaveanyhope．”   Twenty-fiveyearslater．anotherprofessorreadabouttheearliers...
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