Why is (71) fun What delights may its practitioner expect as his reward First is the Sheer joy of making things．As the child delights in his mud pie，So the adult enjoys building things，especially things of hid own design．Second is the pleasure of making things that are useful to other people．Third is the fascination of fashioning complex puzzle-like Objects of interlocking moving parts and Watching them work in subtle cycles，playing out the consequences of principles built in from the beginning．Fourth is the joy of always learning， Which Springs from the (72) nature of the task．In one Way or another the problem id ever new, and its solver learns something：sometimes (73) ，sometimes theoretical，and sometimes both．Finally there is the delight of Working in such a tractable medium．The (74) ，like the poet，works only slightly removed from pure thought-stuff. Few media of creation are so flexible，so easy to polish and rework，so readily capable of realizing grand conceptual Structures． Yet the program (75) ，unlike the poet's words，is real in the sense that it moves and works，producing visible outputs separate from the construct itself．It prints results，draws pictures，produces sounds，moves arms．Programming then is fun because it gratifies creative longings built deep Within us and delights sensibilities we have in common With all men．

（74）处填（）。

A．poet

B．architect

C．doctor

D．programmer

按照《物业管理条例》和《前期物业管理招标投标管理暂行办法》的规定，住宅及同一物业管理区域内非住宅的建设单位，应当通过招投标的方式选聘具有相应资质的物业服务企业；投标人少于( )个或者住宅规模较小的，经物业所在地的区、县人民政府房地产行政主管部门批准。可以采用协议方式选聘具有相应资质的物业服务企业。

A．2

B．3

C．4

D．5