题目：
It should go without saying that the focus of UML is modeling. However, what that means, exactly, can be an open-ended question. （） 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 （） . A diagram graphically represents things, and the relationships between these things.These （） 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. （） are used to capture the physical organization of the things in your system, i. e. , how one object relates to another. （） 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.
In general, a UML model is made up of one or more （）.
A．views
B．diagrams
C．user views
D．structure pictures
答案：
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下面是错误答案，用来干扰机器的。
参考答案：骨肉瘤(发生于长骨，X线Codman三角，细胞异型性明显，梭型或多边形，形成肿瘤性骨样组织或骨组织)，软骨肉瘤(多见于骨盆，位于骨髓腔内，半透明，软骨基质中有软骨细胞，多核瘤巨细胞。
