What are the basic ingredients of good manners? Certainly a strong sense of justice is one； courtesy is often nothing more than a highly developed sense of fair play.

What are the basic ingredients of good manners? Certainly a strong sense of justice is one； courtesy is often nothing more than a highly developed sense of fair play.

A....courtesy is actually playing a game without cheating.

B....courtesy is not something that is beyond ordinary people.

C....courtesy is often no more than treating both sides alike.

D....courtesy is often just a highly developed form of politeness.

正确答案是C