Ravi,like many project__(1)__,had studied the waterfall model of software development as the primary software life-cycle__(2)__.He was all set to use it for an upcoming project,his first assignment.However,Ravi found that the waterfall model could not be used because the customer wanted the software delivered in stages,something that implied that the system had to be delivered and built in__(3)__and not as__(4)__. 　

The situation in many other projects is not very different.The real world rarely presents a problem in which a standard process,or the process used in a previous project,is the best choice.To be the most suitable,an existing process must be__(5)__to the new problem.

A development process,even after tailoring,generally cannot handle change requests.To accommodate change requests without losing control of the project,you must supplement the development process with a requirement change management process.

空白（1）处应选择（）

A.customers

B.managers

C.users

D.administrators

历史唯物主义产生的客观条件有（）

A.人是社会活动的主体

B.人的活动是有目的有计划的

C.长期的奴隶社会和封建社会的人身依附关系

D.资本主义社会的发展，人们的经济关系代替了人身依附关系