题目内容：
Inthefallof1924ThomasWolfe，freshfromhiscoursesinplaywritingatHarvardjoinedtheeightortenofuswhowereteachingEnglishcompositioninNewYorkUniversity.Ihadneverbeforeseenamansotallashe，andsougly.Ipitiedhimandwentoutofmywaytohelphimwithhisworkandmakehimfeelathome.Hisstudentssoonletmeknowthathehadnoneedofmyprotectiveness.Theyspokeofhisabilitytoexplainapoeminsuchamannerastohavethemshoutingwithlaughterorstrugglingtokeepbacktheirtears，ofhisreadinesstoquoteindetailfromanypoettheycouldname.
Indeed，hisstudentsmadesomuchofhispowerofobservationthatIdecidedtomakealittletestandseeformyself.Mychancecameonemorningwhenthestudentswereslowlygatheringfornineo‘clockclasses.
Uponarrivingattheuniversitythatday，IfoundWolfealoneinthelargeroomwhichservedalltheEnglishcompositionteachersasanoffice.HedidnotsayanythingwhenIaskedhimtocomewithmeoutintothehall，andheonlysmiledwhenwereachedaclassroomdoorandItoldhimtoenteraloneandlookaround.
Hesteppedin，remainednomorethanthirtysecondsandthencameout.“Tellmewhatyousee.”IsaidasItookhisplaceintheroom，leavinghiminthehallwithhisbacktothedoor.Withouttheleasthesitationandwithoutasingleerror，hegavethenumberofseatsintheroom，pointedoutthosewhichweretakenbyboysandthoseoccupiedbygirls，namedthecolorseachstudentwaswearing，pointedouttheLatinverbwrittenontheblackboard，spokeofthechalkmarkswhichthecleanerhadfailedtowashfromthefloor，andpicturedindetailtheviewofWashingtonSquarefromthewindow.
AsIrejoinedWolfe，Iwasspeechlesswithsurprise.He，onthecontrary，waswhollycalmashesaid，“TheworstthingaboutitisthatI‘llrememberitall.”
Whatisthepassagemainlydiscussing?
A.ThomasWolfe‘steachingwork.
B.ThomasWolfe‘scourseinplaywriting.
C.ThomasWolfe‘sabilityofexplaining.
D.ThomasWolfe‘sgenius.
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