参考答案：A. Mark Twain shaped the world’s view of America and made an extensive combination of American folk humor and serious literature. The novel has become a great contribution to the legacy of American literature.
B. The novel is written in a language that is totally different from the rhetorical language used by the contemporary writers such as Emerson, Poe and Melville. It is simple, direct, lucid and faithful to the colloquial speech. This style of colloquialism is best described as " vernacular. " He successfully used local color and historical settings to illustrate and shed light on the contemporary society. That’s why he is known as a local colorist. Besides, different characters from different literary or cultural backgrounds talk differently, as is the case with Huck, Tom, and Jim.