In order to keep informed of the latest news in the medical field, we __________ all the main medical journals. A. correspond to B. subscribe to C. look forward to D. contribute to 答案:B列宁主义形成的标志是 A.工人阶级解放斗争协会的成立 B.俄国社会民主工党的成立 C.《火星报》编辑部制定了党纲草案 D.俄国社会民主工党二大召开