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  3. The word "this" (Paragraph 1) probably refers to ______. The potential for hazardous weeds developing from genetically modified

The word "this" (Paragraph 1) probably refers to ______. The potential for hazardous weeds developing from genetically modified

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问题 The word "this" (Paragraph 1) probably refers to ______.
The potential for hazardous weeds developing from genetically modified plants is greatest for ______.
选项 A、crops who rely on herbicides and pesticides for effective harvests
B、areas in which cross-breeding is kept to a minimum
C、agricultural crops grown for their content
D、crops that are closely related to weeds
答案D
解析 这是一道细节题。文章第五、六段指出：实验的发现还是表明，通过基因工程实现的农作物的人工改良能够传播到杂草中，并成为杂草的永久特征；  由于得到了这样的强化，杂草可能对农作物的长期健康发展带来严重的危险；这种危险存在于许多种农作物之中，这些农作物同那些它们与之竞争的杂草有着亲密的关系。这说明，对于那些与杂草有着亲密关系的基因转变农作物来说，成长为危险的杂草的可能性很大。D“与杂草有密切关系的农作物”，与文章的意思相符。与A有关的信息是最后一段的最后一句话，文中是说“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”，这明显与题目的要求不符；文中没有提到B和C。
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考研英语二

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