A、An XP project needs a （73） customer to provide guidance. Customers, programmers, managers, are all working （74） to build the system that's needed, 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.
B、（71） A．importance keys C．roles D．values （72） A．small-sized moderately-sized C．large-sized D．huge-sized （73） A．part-time casual C．seldom D．full-time （74） A．together by themselves C．separately D．alone （75） A．tell know C．communicate D．feedback