- 问题详情:Maryisahighschoolstudent,whodevotedherselftoherlessonseveryday.LastSaturday,asusual,shewenttoseveralclass.Intheevening,shecontinuedtostudyuntildeeplyintonight.Shewastoosleepyandtiredthatshecouldn’tworkeffectively.OntheSundaymorning,shewasabo...
- 14846