His subtle acting made _________ people laugh, feeling more _______ their lives.

A．depressed… content with

B．depressing… pleasant at

C．suffered… satisfied with

D．suffering …please with

软件开发的结构生命周期法(SA)的基本假定是认为软件需求都做到( )。

A．严格定义

B．初步定义

C．早期冻结

D．动态改变