Oneday,aprofessorenteredtheclassroomandaskedhisstudents...
问题详情：Oneday,aprofessorenteredtheclassroomandaskedhisstudentstoprepareforasurprisetest.Theywaitedanxiouslyattheirdesksforthetesttobegin.Theprofessor 41 thequestionpapers,withthetextfacingdownasusu...