美国的幽默大师和现实主义作家马克•吐温，被认为是一个世界文学巨匠，是他奠定了美国文学轻松愉快的、幽默的民族语言风格。但是随着社会的发展以及他对社会认识的加深，马克•吐温的写作风格从前期的幽默发展到后期的辛辣讽刺。文章从不同时期来分析马克•吐温的语言特，分析后期写作风格改变的原因。从而进一步加深对其作品的理解（这是可以对照的中文）下面就是英文了．请帮忙修改一下）
Abstract
Mark Twain, a great American humorist and realism writer, is acknowledged as a master of letters. He laid the foundation of the pleasant and humorous national language style of American literature. However, as the society developed and his understanding of the society increased, Mark Twain’s style of writing developed from humor to irony. This essay analyses the language characteristics of Make Twain of different times and gives the reason why his writing style changed in the latter period, which will enable us to understand his works more deeply.
现在很急！！非常的急！！