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  3. 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  42
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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