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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2023-09-17  25
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] Study done in Swiss and Cornell University indicated that Bt crops could have unreasonable adverse effects on insects in the field.
选项 A、Y
B、N
C、NG
答案 B
解析 文章谈到在瑞士做的研究"provoked widespread worry that Bt plants can inadvertently harm unlucky creatures"在康乃尔大学做的研究表明they had fed milkweed leaves dusted with Bt corn pollen to monarch butterfly larvae in the lab and that those larvae, too, had died.但是作者后来谈到，这一切都是在实验室中进行的，而对于野外的生物，研究的结果则表明没有致命的危害；在文章末尾，有“so far without evidence of unreasonable adverse effects on insects in the field——但是目前还没有证据显示这类农作物会对野外的昆虫造成意想不到的恶果这样的表述。
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