Which of the following is NOT an element of the code of etiquette

单项选择题Etiquette as an art of gracious living is quoted as a feature of which country

单项选择题One characteristic of the rich classes of a declining society is their tendency to______

单项选择题According to the passage, universities like Harvard should______

单项选择题The paradoxes in the passage mean______

单项选择题It can be inferred from the passage that in life's goal people of Harvard are becoming______