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

下表是某同学设计的有关馒头在口腔中变化的实验，请完成以下内容：

A．变蓝B．不变蓝

（2）2号试管的实验现象，是因为唾液中含有______将淀粉分解成了______．

（3）1号试管与2号试管比较得出的结论：馒头变甜与______有关．

（4）2号试管与3号试管比较得出的结论：馒头变甜与______有关．

（5）综上所述，在口腔内馒头变甜与______和______以及______均有关系．

（6）将馒头切碎是模拟______；搅拌是模拟______；37℃加热是模拟______．

（7）该实验中2号试管是______组，l号试管与3号试管是______组．