(2) agriculture; socialism
(3) Incorrect. The people's commune system has greatly surpassed the actual level of productivity development in China; It violates the socialist distribution principle of "distribution according to work"; It has dampened farmers' enthusiasm for production; It has greatly hindered the development of agricultural production.
(4) Farmers' income is low; It is difficult for farmers to seek medical treatment; Farmers are overburdened; The quality of life of farmers is not high.
(5) Yuan Longping; Cultivating indica hybrid rice