Individuals in every culture have similar basic needs but express them differently. In daily life we all initiate (开始) conversation, use of formal and informal speech, give praise, express disagreement, seek information, and extend invitations. Some of the verbal patterns we use are influenced by our culture. Whereas directness in speech is common in the United States, indirectness is the rule in parts of the Far East. Thus people from both of these parts of the world would probably express criticism of others differently. In parts of the Middle East a host is expected to offer food several times but in the United States he may make an offer only once or twice. The different modes of expression represent variations (变化)on the same theme. Each language reflects and creates cultural attitudes; each has a unique way of expressing human need. What is the main point of the passage
A．Directness is characteristic of American speech. B．Indirectness is the role in pans of the Far East. C．One should learn the unwritten rules of the speech in a culture in order to understand the people. D．It’s important to use formal and informal speech in daily conversation.