Object-oriented analysis (OOA) is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is (71) . It determines how the various results are computed by the product and presents this information in the form of a (72) and associated scenarios. The second is (73) , which determines the classes and their attributes. Then determine the interrelationships and interaction among the classes. The last step is (74) , which determines the actions performed by or to each class or subclass and presents this information in the form of (75) .
（73）处填（）。
A．use-case modeling
B．class modeling
C．dynamic modeling
D．behavioral modeling
参考答案：B
解析：
[参考译文]
面向对象的分析(OOA)是一种面向对象范型的半形式化描述技术。面向对象的分析包括3个步骤：第1步是用例建模，它决定了如何由产品得到各项计算结果，并以用例图和相关场景的方式展现出来；第2步是类建模，它决定了类及其属性，然后确定类之间的关系和交互；第3步是动态建模，它决定了类或每个子类的行为，并以状态图的形式进行表示。