Analysis of test questions: ③ ④ The options are correct and accord with the meaning of the questions. The transfer of land contracting rights in the problem promoted the optimal allocation of land resources and protected farmers' land contracting rights, so it was chosen. ① ② The option view does not agree with the meaning of the question. After the transfer of land contract right in question, farmers' income is no longer the principle of distribution according to work, but it has not changed the nature of land ownership, and the land is still owned by the collective, so it is excluded. To solve this problem, we can change all the attributes of land by exclusion, which is obviously wrong.