The angry teacher         the impatient boy who was doing something that had nothing to do with what was being taught.

A．glared at

B．looked into

C．called on

D．watched out

在敏感性分析中，可以通过计算（）来确定敏感因素。

A．不确定因素变化率和敏感度系数

B．指标变化率和敏感度系数

C．敏感度系数和临界点

D．指标变化率和临界点