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) .

（72）处应填（）。

A．collaboration diagram

B．sequence diagram

C．use-case diagram

D．activity diagram

温 * * * * 在2010年2月与网民在线交流时说：“如果说把做大社会财富这个‘蛋糕’看作是政府的责任，那么，分好社会财富这个‘蛋糕’就应是政府的良知。”这番话生动地体现了我国政府

①是人民的政府                 ②要履行经济、社会公共服务职能

③是社会和谐的积极促进者       ④是集中民智的超阶级政府   

A．①②③

B．②③④

C．①③④

D．①②④