听第10段材料,回答第18至20题。(M:)Today I'm going to tell you something about manners in different countries.I think youhave already known that people in different countries have different ways of doing things.Something that is rude in one country may be quite polite in another.For example,in Britain youmustn't lift your bowl to your mouth and you'd better not make a noise when you are having someliquid food.But in Japan you needn't worry about making a noise when you drink it.It shows thatyou are enjoying it.In Britain you try not to put your hands on the table at all during a meal.InMexico,however,guests are expected to keep their hands on the table throughout a meal.But it isin the Arab countries that you really must be careful with your hands.You see in the Arabcountries you mustn't eat with your left hand.This is considered to be very impolite.So,whatshould you do if you visit another country?Well,you needn't worry.You can ask the native peoplethere to help you or just watch carefully and try to do as they do,not as you do at home.第3页共3页