14岁女患者，右下腹包块3个月，肛诊子宫右侧触及约12cm×10cm×8cm囊性肿物，光滑、活动佳，腹部平片右下腹有3个大小不等钙化影，诊断是（）

A.无性细胞瘤

B.良性囊性畸胎瘤

C.内胚窦瘤

D.胀大的膀胱

E.颗粒细胞瘤

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 determines 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. static modeling

B. use-case modeling

C. dynamic modeling

D. class modeling