在费用估算中，（）是在开发研究的初期阶段运用，通常在不能采用费用模型法和参数估算法时才采用。

A．费用模型估算法

B．类比估算法

C．参数估算法

D．费用项目分别估算法

While I was in the foreign country, my younger brother always ____ me of what was happening in big cities in time.

A．approved

B．accused

C．informed

D．warned