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Areyoucarryingtoomuchonyourbackatschool?Lotsofkidsat...
问题详情： Areyoucarryingtoomuchonyourbackatschool?Lotsofkidsatthesameageareasyouare.NotonlyarestudentsinChina 21 fromthisproblem,butkidsintheUnitedStatesare 22 fedupwithheavyschoolba...
