【正确答案】：
A.SOCIAL BACKGROUND：THE IMPACT OF DARWIN’S EVOLUTIONARY THEORY ON THE AMERICAN THOUGHT AND THE INFLUENCE OF THE 19TH CENTURY FRENCH LITERATURE ON THE AMERICAN MEN OF LETTERS GAVE RISE TO YET ANOTHER SCHOOL OF REALISM： AMERICAN NATURALISM. 
B. CARRIE MEEBER IS THE PROTAGONIST OF THE STORY. PENNILESS AND "FULL OF THE ILLUSIONS OF IGNORANCE AND YOUTH,"SHE LEAVES HER RURAL HOME TO SEEK WORK IN CHICAGO. SHE DEVELOPED SEVERAL RELATIONSHIPS WITH MEN. WITH THEIR HELP, SHE BECAME MATURE IN INTELLECT AND EMOTION AND THEN LEFT HURSTWOOD WHO FINALLY COMMITED SUICIDE. CARRIE BECAME A STAR OF MUSICAL COMEDIES, BUT SHE WAS LONELY AND DISSATISFIED.
C. SISTER CARRIE BEST EMBODIES DREISER’S NATURALISTIC BELIEF THAT WHILE MEN ARE CONTROLLED AND CONDITIONED BY HEREDITY, INSTINCT AND CHANCE，A FEW UNSOPHISTICATED HUMAN BEINGS REFUSE TO ACCEPT THEIR FATE AND TRY TO FIND MEANING AND PURPOSE FOR THEIR EXISTENCE. CARRIE, AS ONE OF SUCH, SENSES THAT SHE IS MERELY A CIPHER IN AN UNCARING WORLD YET SEEKS TO GRASP THE MYSTERIES OF LIFE AND THERE-BY SATISFIES HER DESIRE FOR SOCIAL STATUS AND MATERIAL COMFORT. 
【题目解析】：A.Social background：The impact of Darwin’s evolutionary theory on the American thought and the influence of the 19th century French literature on the American men of letters gave rise to yet another school of realism： American naturalism. B. Carrie Meeber is the protagonist of the story. Penniless and "full of the illusions of ignorance and youth,"she leaves her rural home to seek work in Chicago. She developed several relationships with men. With their help, she became mature in intellect and emotion and then left Hurstwood who finally commited suicide. Carrie became a star of musical comedies, but she was lonely and dissatisfied. C. Sister Carrie best embodies Dreiser’s naturalistic belief that while men are controlled and conditioned by heredity, instinct and chance，a few unsophisticated human beings refuse to accept their fate and try to find meaning and purpose for their existence. Carrie, as one of such, senses that she is merely a cipher in an uncaring world yet seeks to grasp the mysteries of life and there-by satisfies her desire for social status and material comfort.