简答题\n Causes for reduction of cultivated area are desertification, urban road and ( ). A、Mining B、Rural residence C、Plant diseases and insect pests D、Greenhouse effect\n简答题\n Establishment of land economics was the ( ) stage of the development of resource and environmental economics. A、first B、second C、third D、fourth\n简答题\n Coase's first theorem was when transaction costs are zero, the allocation of resources can reach the optimal efficiency, regardless of the assignment of property rights.\n简答题\n In 2013, the State Council issued Action Plan for Preventing and Controlling Air Pollution to promote the improvement of air quality and reduce heavy air pollution.\n简答题\n The early thoughts on resource and environmental science included Adam Smith: Invisible Hand, Malthus: Absolute Scarcity and ( ). A、Coase: Coase theorem B、Ricardo: Relative Scarcity C、Mill: Stationary Economy D、Hume: Of the Balance of Trade\n