- 问题详情:阅读理解TheaveragecollegestudentsinAmericaspentanestimated(结算的)$700ontextbookslastyear.TheNationalAssociationofCollegeStoresreportedmorethan$5billioninsalesoftextbooksandcoursematerials(课程资料).OneoftheAssociationspokemanCharlesSchmidtsayselec...
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