阅读理解Havesuccessfulpeopleeverfeltsad?Dotheyhaveany“secrets”tosuccess?TheanswerstothesequestionscanbefoundinUSpresidentBarackObama's“backtoschool”speech．Hereisa

　　阅读理解

　　Havesuccessfulpeopleeverfeltsad?Dotheyhaveany“secrets”tosuccess?TheanswerstothesequestionscanbefoundinUSpresidentBarackObama's“backtoschool”speech．Hereisanexcerpt(摘录)fromhisspeech．

　　Iknowthatsometimesyougetthesensethatyoucanberichandsuccessfulwithoutanyhardwork－thatyourtickettosuccessisthroughrapping(饶舌音乐)orbasketballorbeingaTVstarwhenchancesareyou'renotgoingtobeanyofthosethings．

　　Butthetruthisbeingsuccessfulishard．Youwon'tloveeverysubjectyoustudy．Notallthehomeworkwillseemcompletelyimportanttoyourliferightthisminute．Andyoumaynotsucceedateverythingthefirsttimeyoutry．

　　That'sOK．Someofthemostsuccessfulpeopleintheworldaretheoneswho'vehadthemostfailures．JKRowling'sfirstHarryPotterbookwasturneddown12timesbeforeitfinallycameout．MichaelJordanwascutfromhishighschoolbasketballteamandhelosthundredsofgamesandmissedthousandsofshots(投篮)duringhiscareer．Butheoncesaid“Ihavefailedoverandoverandoveragaininmylife．AndthatiswhyIsucceed．”

　　Thesepeoplesucceededbecausetheyunderstandthatyoucan'tletyourfailuresbeatyou－youhavetoletthemteachyou．Youhavetoletthemshowyouwhattododifferentlynexttime．

　　Noone'sbornbeinggoodatthings．Youbecomegoodatthingsthroughhardwork．

　　Don'tbeafraidtoaskquestions．Don'tbeafraidtoaskforhelpwhenyouneedit．Idothateveryday．Askingforhelpisn'tasignofweakness;it'sasignofstrength．Itshowsyouhavethecouragetoadmit(承认)whenyoudon'tknowsomethingandtolearnsomethingnew．

　　Andevenwhenyou'restrugglingevenwhenyou'rediscouraged(泄气)andyoufeellikeotherpeoplehavegivenuponyou－don'tevergiveuponyourself．Becausewhenyougiveuponyourselfyougiveuponyourcountry．

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　　WhydoesBarackObamamention(提到)JKRowlingandMichaelJordaninthefourthparagraph?