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     Asurveybasingon1,000studentsfoundthathalfofthepupi...
问题详情:     Asurveybasingon1,000studentsfoundthathalfofthepupilsand80%ofthemiddleschoolstudentssleepslessthanninehourseverynight.Toomanyhomeworkgivenbyschoolteachersandparentsisthemainreasons.Ot...
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