UNIFACE采用构件(Component)式的开发，其应用开发分为3个步骤，分别是______。

A．建模、构造和装配

B．分析、设计和实现

C．建模、设计和实现

D．分析、构造和装配

— I wonder why he has been acting so strange these days.

— Recent pressure at work may ________ his behavior. [    ]

A. account for  

B. make for

C. change for  

D. stand for