【正确答案】：
A. MARK TWAIN USES THE MISSISSIPPI VALLY AS HIS FICTIONAL KINGDOM, WRITING ABOUT THE LANDSCAPE AND PEOPLE, THE CUSTOMS AND THE DIALECTS OF ONE PARTICULAR REGION, AND IS THEREFORE KNOWN AS A LOCAL COLORIST.
B. HE CREATES LIFE-LIKE CHARACTERS, ESPECIALLY THE CONVENTIONAL HUCKLEBERRY FINN, WHO RUNS AWAY FROM CIVILIZATION AND STANDS OPPOSITE TO CONVENTIONAL MORALITY.
C. HE USES A SIMPLE, DIRECT VEMACULAR LANGUAGE, TOTALLY DIFFERENT FROM ANY PREVIOUS LITERARY LANGUAGE. IT IS THE KIND OF COLLOQUIAL LANGUAGE BELONGING TO THE LOWER CLASS, THE LIVING LOCAL AMERICAN ENGLISH.
D. HE HAS CRCATED A SPECIAL HUMOR TO SATIRIZE SOCIAL INJUSTICES AND THE DECAYED CONVENTION.
【题目解析】：本题考查的是基于《哈克贝利·费恩历险记》分析马克·吐温小说的设定，语言及人物特点。A. 马克·吐温以密西西比河流域为他的虚构王国，描写一个特定地区的风景和人民、风俗习惯和方言，因此被称为当地的色彩画家。B. 他创造了栩栩如生的人物，尤其是传统的哈克贝利·费恩，他逃离文明，站在传统道德的对立面。C. 他使用了一种简单、直接的语言，与以往任何一种文学语言都截然不同。它是一种属于下层阶级的口语，即生活在当地的美式英语。D. 他创造了一种特殊的幽默来讽刺社会不公正和腐朽的传统。