OnNovember18,1995,ItzhakPerlman,theworldfamousviolinist,cameonstagetogiveaconcertatLincolnCentreinNewYorkCity.IfyouhaveeverbeentoaPerlmanconcert,youknowthatgettingonstageisnoteasyforhim.Hegotpolio（小儿麻痹症）asachild,andhastowalkwiththeaidoftwocrutches（拐杖）now.
ThatnightPerlmanwalkedslowlytohischair.Thenhesatdownandbegantoplay.But,suddenly,oneofthestringsonhisviolinbroke.Youcouldhearitbreak---itbrokewithaloudnoise.
Peoplethoughttothemselves,“Hewouldhavetogetuptoeitherfindanotherviolinorfindanotherstringforthisone.”
Buthedidn’t.Instead,hewaitedamoment,closedhiseyesandthensignaledtheconductortobeginagain.Theorchestra（管弦乐队）began,andheplayedfromwherehehadstopped.Heplayedwithsuchpassionandsuchpower.
Ofcourse,everyoneknowsthatitisimpossibletoplayasymphonicworkwithjustthreestrings.ButthatnightItzhakPerlmanrefusedtoknowthat.Youcouldseehimchangingandrecomposing（重新作曲）thepieceinhishead.
Whenhefinished,therewasasilenceintheroom.Thenpeopleroseandcheered.Wewereallonourfeet,doingeverythingwecouldtoshowhowmuchweappreciatedwhathehaddone.
Hesmiledandthenhesaidinaquiettone,“Youknow,sometimesitistheartist’stasktofindouthowmuchmusicyoucanmakewithwhatyouhaveleft.”
HiswordshavestayedinmymindeversinceIheardthem.Thatisalsothewayoflife.Perhapsourtaskinthisquicklychangingworldinwhichweliveistomakemusic,atfirstwithallthatwehave,andthen,whenthatisnolongerpossible,tomakemusicwithwhatwehaveleft.
小题1:HoldingaconcertischallengingforPerlmanbecause______.