题目内容：
根据以下材料，回答题Itiscustomaryforadultstoforgethowhardanddullandlongschoolis．Thelearningbymemoryofallthebasicthingsonemustknowisamostincredibleandunendingeffort．Learningtoreadisprobablythemostdifficultandrevolutionarythingthathappenstothehumanbrainandifyoudon’tbelievethat，watchanilliterateadulttrytodoit．Schoolisnoteasyanditisnotforthemostpartverymuchfun，butthen，ifyouareverylucky，youmayfindarealteacher．Threerealteachersinalifetimeistheverybestofmyluck．Myfirstwasascienceandmathteacherinhighschool，mysecond，aprofessorofcreativewritingatStanford，andmythirdwasmyfriendandpartner，EdRicketts．
Mythreehadthesethingsincommon：Theyalllovedwhattheyweredoing．Theydidnottell；theycatalyzedaburningdesiretoknow．Undertheirinfluence，thehorizonssprungwideandfearwentawayandtheunknownbecameknowable．Butmostimportantofall，thetruth，thatdangerousstuff，becamebeautifulandveryprecious．
Ishallspeakonlyofmyfirstteacherbecauseinadditiontotheotherthings，she：broughtdiscovery．Shearousedustoshoutin9，book—wavingdiscussions．Shehadthenoisiestclassinschoolandshedidn’tevenseemtoknowit．Wecould．neversticktothesubject．Ourspeculationrangedtheworld．Shebreathedcuriosityintoussothatwebroughtinfactsortruthsshieldedinourhandslikecapturedfireflies．
ICalltellmysonwholooksforwardwithhorrortofifteenyearsofdrudgerythatsomewhereinthedustydarkamagicmayhappenthatwilllightuptheyearsifheisverylucky．
Accordingtotheauthor，whatisthedifficultthingtopeopleinschool? A．Listening．
B．Reading．
C．Writing．
D．Speaking．
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