1)schooluniformsshouldbemandatoryforallstudentsforanumberofreasons.2)Firstofall,uniformsmakeeveryoneequal.3)Inthisway,the"rich"kidsareonthesamelevelasthepoorones.4)Inaddition,gettingreadyforschoolcanbemuchfasterandeasier.5)Manykidswastetimechoosingwhattoweartoschool,andtheyandtheirparentsareoftenunhappywiththeirfinalchoices.6)Mostimportant,somestudiesshowthatschooluniformsmakestudentsperformbetterinschool.7)Manypeoplemightsaythatuniformstakeawayformpersonalfreedom,butIbelievethebenefitsarestrongerthanthedrawbacks.Q1:whichisthetopicsentence? A: sentence1) B: sentence7) C: sentence3) D: sentence4)