●ExtrEmE progrAmming (xp) is A DisCiplinE oF soFtwArE DEvElopmEnt with (71) oF simpliCity, CommuniCAtion，FEEDBACk AnD CourAgE．suCCEssFul soFtwArE DEvElopmEnt is A tEAm EFFort-not just thE DEvElopmEnt tEAm，But thE lArgEr tEAm Consisting oF CustomEr, mAnAgEmEnt AnD DEvElopErs．xp is A simplE proCEss thAt Brings thEsE pEoplE togEthEr AnD hElps thEm to suCCEED togEthEr．xp is AimED primArily At oBjECt-oriEntED projECts using tEAms oF A DozEn or FEwEr progrAmmErs in onE loCAtion．thE prinCiplEs oF xp Apply to Any (72) projECt thAt nEEDs to DElivEr quAlity soFtwArE rApiDly AnD FlExiBly． An xp projECt nEEDs A (73) CustomEr to proviDE guiDAnCE．CustomErs，progrAmmErs， mAnAgErs，ArE All working (74) to BuilD thE systEm thAt’s nEEDE
D、CustomErs-thosE who hAvE soFtwArE thAt nEEDs to BE DEvElopED-will lEArn simplE, EFFECtivE wAys to (75) whAt thEy nEED，to BE surE thAt thEy ArE gEtting whAt thEy nEED，AnD to stEEr thE projECt to suCCEss．
A、tEll
B．know
C．CommuniCAtE
D、FEEDBACk