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 often simply acting according to rules honestly.
B、...courtesy is not something that is beyond ordinary people.
C、...courtesy is often just a widespread practice of politeness.
D、...courtesy is actually playing a game without cheating.
【正确答案】：A
