Analysis of test questions: From the information such as "the middle section of Luo Xiao Mountain at the junction of Hunan and Jiangxi", it can be known that this refers to the establishment of Jinggangshan revolutionary base area, which is the first rural revolutionary base area, so choose item C, and mistake A should be Ruijin, Jiangxi; Error B should be after the autumn harvest uprising failed to attack Changsha; Item d should be the Shaanxi-Gansu-Ningxia border region.

Comments: The theory of armed separation of workers and peasants is a model of combining Marxist principles with China's national conditions and an important part of Mao Zedong Thought. Under the guidance of Marxism, Mao Zedong opened up rural revolutionary base areas, gradually moved towards rural areas and surrounded cities, and seized power by armed forces.