With the publication of ________, Theodore Dreiser was launching himself upon a long career that would ultimately make him one of the most significant American writers of the school later known as literary naturalism.

A．Sister Carrie

B．The Titan

C．An American Tragedy

D．The Stoic

农民工的养老保险费用由（）

A.用人单位缴纳

B.农民工自行缴纳

C.用人单位和农民工共同缴纳

D.社会保险机构缴纳