PartⅢReadingComprehension(40points,2pointseach)Directions:Therearefourpassagesinthissectionandeachpassageisfollowedbysomequestionsorunfinishedstatements.ForeachofthemtherearefourchoicesmarkedA,B,CandD.YoushoulddecideonthebestchoiceandthenmarkthecorrespondingletterontheAnswerSheetwithasinglelinethroughthecenter.PassageOneQuestions31to35arebasedonthefollowingpassage:Wishingtoencourageheryoungson’sprogressonthepiano,amothertookherboytoaPaderewski(帕德雷夫斯基)concert.Aftertheywereseated,themotherspottedafriendintheaudienceandwalkeddowntheaisle(过道)togreether.Seizingtheopportunitytoexplorethewondersoftheconcerthall,thelittleboyroseandeventuallyexploredhiswaythroughadoormarked“NOADMITTANCE”.Whenthehouselightsdimmed(变暗淡)andtheconcertwasabouttobegin,themotherreturnedtoherseatanddiscoveredthechildwasmissing.Suddenly,thecurtainspartedandspotlightsfocusedontheimpressiveSteinway(施坦威钢琴)onthestage.Inhorror,themothersawherlittleboysittingatthekeyboard,innocentlypickingout“Twinkle,twinkle,littlestar.”Atthatmoment,thegreatpianomastermadehisentrance,quicklymovedtothepiano,andwhisperedintheboy'sear,“Don’tquit.Keepplaying.”Thenleaningover,Paderewskireacheddownwithhislefthandandbeganfillinginabasspart.Soonhisrightarmreachedaroundtotheothersideofthechildandheaddedarunningobbligato(伴奏).Together,theoldmasterandtheyoungnovice(初学者)transformed(转变)afrighteningsituationintoawonderfullycreativeexperience.Theaudiencewasmesmerized(陶醉).31.Themothertooktheboytotheconcertbecause（）.