Analysis of test questions: The contents of Dai Lu Chunqiu show that agricultural production should be kept in farming season, the contents of agricultural books are the viewpoint of using fertilizer, and Qi Yaomin's book reflects the time problem of agricultural planting. These three items all reflect the characteristics of intensive cultivation in agricultural production, and the content in Shang Jun Book reflects the policy of emphasizing agriculture and restraining business, so the answer is C.