[单选题]PassagethreeSafetyisveryimportantinschools,however,accidentsoftenhappen,sotheremustbepeopleatschoolwhoknowhowtodofirstaid.Firstaidishelpthatyougivetosomeonewhohassuddenlyfallenillorwhohashadanaccident.Youdon’thavetobeadoctororanurse.Anyonecanbeafirstaider(that’ssomeonewhoknowsfirstaid),butinmostschools,theonlyfirstaidersareteachers.Therearealotmorechildrenthanteachersinanyschool,sowhynotteachthechildrenfirstaid?That’sexactlywhatwe’vedoneinmyownschool.Theschool’steamoffirstaidersnowhasthirty-twomembers,someasyoungaseleven,whoknowwhattodowhensomeoneisindanger.Everyyearnursesfromalocalhospitalteachourchildrenthenecessaryskillstosavelives.Childrenaretaughtwhattodo,forexample,ifafriendoftheirshasaheadache.Theyknowhowtocleanandcoveracutifsomeonehurtsthemselvesdoingsport.Theyalsoknowwhattodoifsomeoneisinrealdanger.Recently,twostudentsfrommyschoolwereabletousetheirnewskills.13-year-oldMikeandhisfriendJoewereplayingtogetherwhenJoegotapieceofappleinhisthroatthatwouldn’tmove.Althoughhisfriendwasingreatdanger,Mikewasnotfrightened.Withonemove,hetooktheappleoutandsavedJoe’slife.11-year-oldKim’sstoryisevenmoreamazing.Hermumsuffersfromaheartproblem.Oneevening,hermumsuddenlyfelltotheground.Kimknewexactlywhattodo.Shecalledanambulanceandtookcareofhermumuntilhelparrived.Withthenecessaryfirst-aidknowledge,thestudentsdidareallygoodjob.21.Whatmaythewriterprobablybe?
