根据下面资料，回答 AproverbfromancientChinawaswidelyspreadintheWest:"Ifyouwanttobehappyforafewhours,gotogetdrunk;ifyouwantthehappinesstolastthreeyears,getmarried;ifyouwantlifetimehappiness,takeupgardening."Thereasonforthelastisthis:Gardeningisnotonlyuseful,butithelpsyoutoidentifyyourselfwithnature,andthusbringsyounewjoyeachdaybesidesimprovingyourhealth. AresearchofaUSuniversitythatI′vereadgivesadefinitionofhappinessaswhatmakesapersonfeelcomfortablypleased.Toputitsimply,happinessisanactivestateofmindwhereonethinksone′slifeismeaningful,satisfactoryandcomfortable.Thisshouldbesomethinglastingratherthantransitory. Lotsofpeopleregarditthehappiesttobeatleisure.Butaccordingtoastudy,itisnotapersonwithplentyofleisurebutoneatworkthatfeelshappy,especiallythosebusywithworkhavinglittletimeforleisure.Happinessdoesnotmeangainsoneisafterbutadesiretoharvestwhatoneisseekingfor.Peopleoftendonottreasurewhattheyalreadyhavebutdesirewhattheycannotget.Thatissomewhatlikeamanwithfonddreamsofnumerousloverswhileunwillingtosettledownwiththewomanbesidehim. Happinessisagamebalancingbetweentwoends--whatonehasandwhatonewishesfor,i.e.one′sdreamandthepossibilitytorealizeit.Thestudycomestothisconclusion:Ahappymanisonewhoaimshighbutneverforgetshisactualsituation;onewhomeetschallengesthatdevelophisabilityandpotentiality;onewho′sproudofhisachievementsandtherecognitiongiventohim.Hehasself-respectandself-confidence;treasureshisownidentityandlovesfreedom.Heissociableandenjoyswiderangecommunicationwithothers;he′shelpfulandreadytoacceptassistance.Heknowsheisabletobearsufferingsandfailures;heissensibleenoughtogetfunfromdailywork.Heisamancapableofloveandpassion. Accordingtothepassage,gardeningcanbringlifetimehappinessbecause_____________.
A.it is a profitable business B.it can strengthen gardeners' ability to remark nature C.a gardener can enjoy a very happy marriage D.nature is a source of joy forever正确答案D
