【正确答案】 Firstly, the understanding of certain backgrounds is of great significance to the cross-cultural communication. The ignorance of differences between cultures will cause trouble to Chinese in A-merica and also Americans in China. There are two kinds of communication between human beings: one is extroverted, the other is introverted. Like the computer programs, the extroverted communication processes according to the well-edited programs, or it can' t work. The American culture is extroverted, so American people express their ideas as explicit and brief as possible so as to communicate. On the contrary, communication with the introverts is like that between the twin brothers or sisters, because they have tacit understanding and only need simple sentences or phrases in their conversations. For example, if you don' t have a general understanding of a certain character and its context, the problem will be difficult to settle even with the help of a dictionary, because the meaning of the character closely ties up to the context.