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  3. The word "this" (Paragraph 1) probably refers to ______. It is implied that the main impact that gene transfer between crops an

The word "this" (Paragraph 1) probably refers to ______. It is implied that the main impact that gene transfer between crops an

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问题 The word "this" (Paragraph 1) probably refers to ______.
It is implied that the main impact that gene transfer between crops and weeds could have is.
选项 A、the rapid development of unintended plant hybrids
B、the collapse of the agricultural industry
C、the development of pest and herbicide-resistant weeds
D、the difficulty to determine the given nature of current research
答案C
解析 这是一道推论题。文章最后两段指出：斯诺担心的是，基因从农作物转移到这些有关的杂草上可能使除草剂迅速失效；现代农业非常依赖于除草剂，所以人们会注意这些除草剂何时会失效。由此可知，基因从农作物到杂草的转变可能产生的主要影响就是能够抵抗除草剂的杂草和害虫的肆意发展。C与文章的意思相符。与A有关的信息是第三段的第一句话，文中是说“……最终可能会对农作物产生无意识的、有害的结果”，这明显与题目的要求不符；文中没有提到B和D。
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