阅读理解。 Many years ago, children who had good manners kept quiet if their parents were talking with other persons. Today, well-mannered children have more freedom. Sometimes good manners in one place are bad manners in other place. Suppose you are a visitor in the land of Mongolia. 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 (打嗝)' after you finish eating. Burping will show that you like your food. In some countries, if you give a loud 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. What are good manners like in an East Africa town? The people try not to see you. They are being polite. You may see a friend. He may not see you at all. If you’re polite, you will sit down beside him. You will wait until he finishes what he doing. Then he will talk to you. Suppose you visit a friend in Arabia. You should walk behind the tents until you come to his tent. If you pass in front of the other tents, you will be asked into them. The people will ask you to eat with them. And it is bad manners if you say no. 1. In Mongolia, burping is a way of showing that __ _. A. your meal is not good B. you are not full C. you enjoyed your meal D. you want to eat more 2. In Polynesia, to be polite while eating you should _ ___. A. talk much with others B. sit still C. eat quickly D. turn your back on others 3. In East Africa, people __ __ a visitor _____ he finishes what he is doing. A. don’t like; until B. won’t talk to; until C. like to walk with; while D. talk to; before 4. In Arabia it is bad manners _____. A. to say no if you’re asked to eat B. to visit a friend C. to refuse to sit down D. to walk behind the tents 5. What’s the main idea of the passage? A. Good manners are different in different countries. B. Children should have good manners. C. Good manners and bad manners in Africa. D. Good manners are always good manners in different countries.