阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。
Suppose you are a visitor in the land of Mongolia（蒙古）, some friends ask you to eat with them. What kind of manners do they want you to have? They want you to give a loud burp（打饱嗝儿）after you finish eating. Burping would show that you like your food. In some countries, if you give a big burp, you are told to say “Excuse me, please”.
In many places people like to eat together. But in some parts of Polynesia it is bad manners to be seen eating at all. People show their good manners by turning their backs on others while they eat.
