地含 tegrated structure Part/Para. 1: It serves as an introduction ofthe whole text. Part /l(Para2-18: It provides his early life his success and comments on his works Part Ill(Para. 19-21): It devotes to his Mark Twain personal tragedy and conclusion.Mark Twain —Mirror of America Part I (Para.1): It serves as an introduction of the whole text. Part II(Para2-18): It provides his early life, his success and comments on his works. Part III (Para.19-21): It devotes to his personal tragedy and conclusion