8Huang J K,Hu R F,Rozelle S,et al. Insect-resistant GM rice in farmers' fields : assessing productivity and health effects in China. Science,2005,308 : 688-690.
9US Department of Agricuhure, Economic Research Service. ( 2011 ) http : //www. ers. usda. gov/Data/BiotechCrops/.
10US Department of Agriculture,Economic Research Service. (2011 ) http : //usda. mannlib, cornell, edu/MannUsda/viewDoeumentlnfo. do?documentID= 1282.