A、Because he is thirsty. B、Because he loves drinking. C、Because it is good manners. D、Because he has not had enough. CWhy does a

Different countries and different races have different manners. Before entering a house in some Asian countries, it is good manners to take off your shoes. In European countries, even though shoes sometimes become very muddy, this is not done. A guest in a Chinese house never finishes a drink. He leaves a little, to show that he has had enough. In England, a guest always finishes a drink to show that he has enjoyed it.
    We must find out the customs of other races, so that they will not think us ill-mannered. But people all over the world agree that being well-mannered really means being kind and helping others, especially those older or weaker than ourselves. If you remember this, you will not go very far wrong.
    Here are some examples of the things that a well-mannered person does or does not do. He never laughs at people when they are in trouble. Instead, he tries to help them. He is always kind, never cruel, either to people or animals. When people are waiting for a bus, or in a post office, he takes his turn. He does not push to the front of the queue. In the bus, he gives his seat to an older person or a lady who is standing. If he accidentally humps into someone, or gets in their way, he says "Excuse toe" or "I’m sorry".
    He says "Please" when making a request, and "Thank you" when he receives something. He stands up when speaking to a lady or an older person, and he does not sit down until the other person is seated. He does not talk toe much himself. He does not talk with his mouth full of food. He uses a handkerchief when he sneezes or coughs.