CHEMICALVERSUSORGANICFARMINGChemicalpesticidesandartifi...
问题详情:CHEMICALVERSUSORGANICFARMINGChemicalpesticidesandartificialfertilisers________________(spread)useinfarmingsincethemiddleofthe20thcentury.Whentheywerefirstintroduced,manyfarmerswelcomedthem____...