单选题

　　1.【完成句子】Americans eat with knives and forks;Japanese eat with chopsticks. Americans say "Hi" when they meet;Japanese bow. Many American men open doors for women;Japanese men do not. On the surface,it appears that good manners in America are not good manners in Japan,and in a way this is true. But in any country,the only manners that are important are those involving one person's behavior toward another person. In all countries it is good manners to behave considerately toward others and bad manners not to. It is only the way of behaving that differs from country to country.

　　The topic sentence of this paragraph is__________.

　　A.Americans eat with knives and forks； Japanese eat with chopsticks.

　　B.Many American men open doors for women;Japanese men do not.

　　C.The way of behaving that differs from country to country.

　　D.In all countries it is good manners to behave considerately toward others and bad manners not to.