It should go without saying that the focus of UML is modeling. However, what that means, exactly, can be an open-ended question. (71) is a means to capture ideas, relationships, decisions, and requirements in a well-defined notation that can be applied to many different domains. Modeling not only means different things to different people, but also it can use different pieces of UML depending on what you are trying to convey. In general, a UML model is made up of one or more (72) . A diagram graphically represents things, and the relationships between these things. These (73) can be representations of real-world objects, pure software constructs, or a description of the behavior of some other objects. It is common for an individual thing to show up on multiple diagrams; each diagram represents a particular interest, or view, of the thing being modeled. UML 2.0 divides diagrams into two categories: structural diagrams and behavioral diagrams. (74) are used to capture the physical organization of the things in your system, i. e. , how one object relates to another. (75) focus on the behavior of elements in a system. For example, you can use behavioral diagrams to capture requirements, operations, and internal state changes for elements.

（74）处应填（）。

A．Activity diagrams

B．Use-case diagrams

C．Structural diagrams

D．Behavioral diagrams

网络博客的迅猛发展，为人们展示自我和信息交流提供了新的有益平台。我国公民通过“博客”表达个人或团体对某些事务的见解、主张，国 * * 障公民依法发表个人主张、观点。这表明[ ]

①网络扩大了我国公民的政治权利

②我国公民享有言论自由的权利

③我国公民与国家是和谐统一的关系

④国 * * 护公民的权利

A、①②

B、②③

C、③④

D、①④