Whyis()funWhatdelightsmayitspractitionerexpectashisreward?Firstisthesheerjoyofmakingthings.Asthechilddelightsinhismudpie,sotheadultenjoysbuildingthings,especiallythingsofhisowndesign.Secondisthepleasureofmakingthingsthatareusefultootherpeople.Thirdisthefascinationoffashioningcomplexpuzzle-likeobjectsofinterlockingmovingpartsandwatchingthemworkinsubtlecycles,playingouttheconsequencesofprinciplesbuiltinfromthebeginning.Fourthisthejoyofalwayslearning,whichspringsfromthe()natureofthetask.Inonewayoranothertheproblemisevernew,anditssolverlearnssomething:sometimes(请作答此空),sometimestheoretical,andsometimesboth.Finally,thereisthedelightofworkinginsuchatractablemedium.The(),likethepoet,worksonlyslightlyremovedfrompurethought-stuff.Fewmediaofcreationaresoflexible,soeasytopolishandrework,soreadilycapableofrealizinggrandconceptualstructures.Yettheprogram(),unlikethepoet'swords,isrealinthesensethatitmovesandworks,producingvisibleoutputsseparatefromtheconstructitself.Itprintsresults,drawspictures,producessounds,movesarms.Programmingthenisfunbecauseitgratifiescreativelongingsbuiltdeepwithinusanddelightssensibilitieswehaveincommonwithallmen.
A.semantic]
B.practical
C.lexical
D.syntactical
正确答案是B