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 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．

（73）处填（）。

A．part-time

B．casual

C．seldom

D．full-time

B(a)P

A．可致肺水肿
B．影响血红蛋白与氧的结合，使血红蛋白失去携氧能力
C．可引起肺癌
D．导致慢性阻塞性肺部疾患
E．对眼结膜和呼吸道黏膜具有刺激作用