1阅读下面短文,从短文后所给各题的四个选项(A,B,C,D)中,选出可以填入空白处的最佳选项
IteacheconomicsatUNLVthreetimesperweek
LastMonday,atthebeginningofclass,I31askedmystudentshowtheirweekendhadbeen
Oneyoungmansaidthathisweekendhadnotbeensogood
Hehadhiswisdomteeth32
TheyoungmanthenproceededtoaskmewhyI33seemedtobesocheerful
Hisquestion34meofsomethingI’dreadsomewherebefore:“Everymorningwhenyougetup,youhaveachoiceabouthowyouwantto35lifethatday,”Isaid“Ichoosetobecheerful
”“Letmegiveyoua(n)36,”Icontinued,37allsixtystudentsintheclass
“InadditiontoreachinghereatUNLV,IalsoteachatthecommunitycollegeinHenderson,17milesdownthefreewayfromwhereIlive
OnedayafewweeksagoIdrovetoHenderson
I38thefreewayandturnedontoCollegeDrive
Ionlyhadtodriveanotherquartermiledowntheroadtothecollege
Butjustthenmycar39
Itriedtostartitagain,buttheenginewouldn’t40