During the students’ first teacher training year, they often visited schools for the _____ of lessons.

A．examination

B．investigation

C．inspection

D．observation

逻辑最大的用处是什么（）？

A、怎么构造完美结构

B、怎么构造假说

C、怎么把推理运用于论证

D、怎么推理出正确结论