An architectural style defines as a family of such systems in terms of a （1）of structural organization. More specifically, an architectural style defines a vocabulary of（2） and connector types, and a set of （3） on how they can be combined. For many styles there may also exist one or more （4） that specify how to determine a system’s overall properties from the properties of its parts. Many of architectural styles have been developed over the years.
The best-known examples of （5） architectures are programs written in the Unix shell.
（1）是（）
A. pattern
B. data flow
C. business process
D. position level
参考答案：A
解析：
[参考译文] 400架构风格以一种结构化组织模式定义一组这样的系统。具体来说，一种架构风格定义了一个构件及连接器类型的词汇表，以及一组关于它们如何能够被关联的约束对于许多风格来说，可能也存在一个或多个语义模型，从系统部件的特性来确定系统的整体特性。许多架构风格已经发展了很多年，众所周知的管道-过滤器架构的例子就是用UNIX shell编写的程序。