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Many experts who favor genetically modified foods believe that genetic engineeri
Many experts who favor genetically modified foods believe that genetic engineeri
游客
2024-06-18
32
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问题
Many experts who favor genetically modified foods believe that genetic engineering can help to meet the demands of the world’s increasing population. [br] Among all the GM crops, Bt genes have proved most effective in ______ when the largest reduction in pesticide use has been reported.
选项
答案
cotton
解析
文章里有这样的表述: "of all the crops carrying Bt genes, cotton has brought the biggest drop in pesticide",而后文章里有具体的种植事例来加以证明:根据美国环保署的资料,1999年大量种植Bt棉花的各州,杀虫剂的喷洒量比往常减少了21%。环保署病虫害防治部门的行政人员Johnson说,那个数字“非常戏剧性,让人印象深刻”。通常在一个生长季中,农人要在棉花田里喷洒7~14次杀虫剂,“如果你种的是Bt棉花,你或许只需施用少量刺鼻的化学药剂,甚至根本就用不着了!而对于其他的作物农药用量较少的现象,文章里面的观点是“这两种作物的农药用量本来就比较少,而且它们所遭受的虫害不一定严重。”
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