【正确答案】：
A. NATURALISM WAS GREATLY INFLUENCED BY DARWIN‘S EVOLUTIONARY THEORY AND FRENCH LITERATURE. 
B. NATURALISTS ACCEPTED THE MORE NEGATIVE IMPLICATIONS OF DARWIN‘S THEORY AND USED IT TO ACCOUNT FOR THE BEHAVIOR OF THOSE CHARACTERS IN LITERARY WORKS WHO WERE CONCEIVED AS MORE OR LESS COMPLEX COMBINATIONS OF INHERITED ATTRIBUTES, THEIR HABITS CONDITIONED BY SOCIAL AND ECONOMIC FORCES. 
C. NATURALISM IS EVOLVED FROM REALISM WHEN THE AUTHOR‘S TONE IN WRITING BECOMES LESS SERIOUS AND LESS SYMPATHETIC BUT MORE IRONIC AND MORE PESSIMISTIC.  
【题目解析】：A.自然主义深受达尔文进化论和法国文学的影响。B自然主义者接受了达尔文理论更为消极的含义，并用它来解释文学作品中那些或多或少被认为是遗传属性的复杂组合的人物的行为，他们的习惯受到社会和经济力量的制约。C自然主义是从写实主义演变而来的，当作者的写作基调变得不那么严肃，不那么富有同情心，但却更加讽刺和悲观。