单选题从供选择的答案中，选出最确切的解答。
The Rational Unified Process (RUP) is a software engineering process, which captures many of best practices in modern software development. The notions of (1) and scenarios have been proven to be an excellent way to capture function requirements. RUP can be described in two dimensions-time and content. In the time dimension, the software lifecycle is broken into cycles. Each cycle is divided into four consecutive (2) which is concluded with a well-defined (3) and can be further broken down into (4) -a complete development loop resulting in a release of an executable product,a subset of the final product under development, which grows mcrementally to become the final system. The content structure refers to the disciplines, which group (5) logically by nature.

【正确答案】 C

【答案解析】A的意思是“人造物品”，D的意思是“工人们”，与题目意思完全不符合，首先排除。B的意思是“用例”， C的意思是“角色”，根据专业知识这里应该选C。
[参考译文]Rational Unified Process (RUP)是一个软件工程方法，在现代软件开发中已经获得了众多最佳实践。角色和情景的想法已经被证明是获得功能需求的优秀方法。RUP可以被描述为两个维——时间和内容。在时间维，软件生命期被分为许多周期。每个周期都被分为4个连续的阶段，每个阶段由预先定义好的标志结束，并且这些周期将来可以被分为一些循环——一个完整的开发循环产生一个良好的产品版本，最终产品的子集(逐步增加完善成为最终的系统)。内容结构指规则，按照自然的逻辑分为功能组。