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（）

A．use-case modeling

B．class modeling

C．dynamic modeling

D．behavioral modeling

治疗月经后期血虚证，应首选的方剂是（）

A.六味地黄丸

B.当归地黄饮

C.滋血汤

D.八珍汤

E.大补元煎