To learn is one thing, to teach is （）

A．The city nearby offered all kinds of fun.
B．The area produced the finest wine in Italy.
C．Few people expected the volcano to erupt again.
D．The mountain was beautiful and covered with grass.

A．it’s impossible for people with jobs to lose their identity
B．people’s identity can be recognized more easily by their uniforms
C．nurses and policemen must wear uniforms when working
D．people in those professions act in an easier way without uniforms