题目内容：
Questionsarebasedonthefollowingpassage:
Humanneedsseemendless.Whenahungrymangetsameal,hebeginstothinkaboutanovercoat,whenamanagergetsanewsportscar,abighouseandpleasureboatsdanceintoview.
Themanyneedsofmankindmightberegardedasmakingupseverallevels.Whenthereismoneyenoughtosatisfyonelevelofneeds,anotherlevelappears.
Thefirstandthemostbasiclevelofneedsinvolvefood.Oncethislevelissatisfied,thesecondlevelofneeds,clothingandsomesortofshelter,appears.BytheendofWorldWarII,theseneedsweresatisfiedforagreatmajorityofAmericans.Thenathirdlevelappeared.Itincludedsuchitemsasautomobilesandnewhouses.
By1957or1958thisthirdlevelofneedswasfairlywellsatisfied.Then,inthelate1950s,afourthlevelofneedsappeared:the"life-enriching"level.Whiletheotherlevelsinvolvephysicalsatisfaction,thatis,thefeelingcomfort,safety,andtransportation,thislevelstressesmentalneedsforrecognition,achievement,andhappiness.Itincludesavarietyofgoodsandservices,manyofwhichcouldbecalled"luxury"items.Amongthemarevacationtrips,thebestmedicalanddentalcare,andrecreation.Alsoincludedherearefancygoodsandthelateststylesinclothing.
Onthefourthlevel,alotofmoneyisspentonservices,whileonthefirstthreelevelsmoreisspentongoods.Willconsumersraisetheirsightstoafifthlevelofneedsastheirincomeincreases,orwilltheycontinuetodemandluxuriesandpersonalservicesonthefourthlevel?
Afifthlevelwouldprobablyinvolveneedsthatcanbeachievedbestbycommunityaction.
Consumersmaybespendingmoreontaxestopayforgovernmentactionagainstdisease,ignorance,crime,andprejudice.Afterfillingourstomachs,ourclothesclosets,ourgarages,ourteeth,andourminds,wenowmayseektoensurethehealth,safety,andleisuretoenjoymorefullythegoodthingsonthefirstfourthlevels.
Accordingtothepassage,manwillbegintothinkaboutsuchneedsashousingandclothingonlywhen（ ）. A．hehassavedupenoughmoney
B．hehasgrowndissatisfiedwithhissimpleshelter
C．hehassatisfiedhishunger
D．hehaslearnedtobuildhouses
参考答案：
答案解析：