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) .

（74）处填（）。

A．use-case modeling

B．Glass modeling

C．dynamic modeling

D．behavioral modeling

下列说法正确的是 [ ]

A．Na₂O₂和水的反应是放热反应

B．放热反应都不需加热即可进行

C．若反应物总能量低于生成物总能量，该反应为放热反应

D．灼热的C与CO₂的反应为放热反应