Analysis of test questions: In the early 1960s, the correct expression of the eight-character policy put forward by the Central Committee of the Communist Party of China to correct the "Left" errors in rural work was adjustment, consolidation, enrichment and improvement. In practice, mainly through adjustment, the proportional structure of the national economy has been improved. So choose c, and nothing else holds.
Comments: Due to the left-leaning mistakes of the Great Leap Forward and the People's Commune Movement, the national economy is facing serious difficulties. 1960, the state put forward the policy of rectifying the national economy for the first time: adjustment, consolidation, enrichment and improvement. By 1962, the national economy began to improve. The eight-character policy corrected the left-leaning mistakes, but it did not fundamentally eliminate them.