The traditional approach ____ with complex problems is to break them down into smaller, more easily managed problems.

A．to dealing

B．in dealing

C．dealing

D．to deal

在干、支流交汇水域，选好航路、摆好船位和作好避让的前提高条件是（）.

A、判断干流主流的位置

B、判断支流主流的位置

C、判断回流、夹堰的强度和范围

D、ABC都对