题目内容：
根据以下材料，回答题ToMissDoughty
16September1962,Sunday
Mydear,
Well,hereweare-butnothere.YouareinPrinceton,andmeinQuogue,andanotherbrandnewyearisabouttostartforyou.Forme,too.
Itisthebeginningofabigyearforyou,inmanyrespectsyourbiggestsofar.Bythetime,Junecomesaround,youwillbe18,andgraduatingfromschool.InthepastweekorsoIhavecalledyou
"Kid",butsubconsciouslyIhavebeendoingthatbecauseyourkiddaysareover,orjustabout.Isuspectthatyouaregoingthroughtheexperienceoffirstlove,andnomatterwhatelsehappens,afterthatexperienceyouareneverakidagain.
Mostofthenicethingsweassociatewithbeingakidareokaywhileyouarestillakid.Butyougainmorethanyoulose.Yougaininunderstandingstanding,inappreciationofpeople,inun-derstandingandappreciationofpeople.YoubegintoseethewisdominthatquotationIhavesooftenrepeatedtoyou:tothineownselfbetrue.EveryyearatthistimeIhaverepeatedthat
quotationtoyou,andthetimeisnotreallytoofardistantwhenyouwillbepassingitontoyourownchildren.ItisprobablythebestsinglepieceofadviceIcangiveyou,oryoucangivethem.
Youhavedonewell,andIampleasedwithyou,notonlyforwhatyouhavedone,butforwhatyouare.SogoodluckinyourSeniorYear,andalwaysknowthattheoldmanlovesyouverymuch.
Afterfinishingthepassage,weknow__________. A．itisapubliclettertostudents
B．itisaposterfromstudents'union
C．itisaletterfromafathertoadaughter
D．itisadairyaboutgrowingup
参考答案：
答案解析：