quEstions 21-30
ChoosE thE CorrECt lEttEr,A,
B、orC、
whiCh point is right ABout photoCopiEr in liBrAryA．only Full-timE CoursE stuDEnts CAn usE photoCopiEr.
B、stuDEnts hAvE to usE uCArD whEn thEy photoCopy mAtEriAls.
Colour Copy AnD BlACk AnD whitE Copy hAvE thE sAmE priC