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  3. The word "this" (Paragraph 1) probably refers to ______. That genetically modified crops could have harmful effects can be dedu

The word "this" (Paragraph 1) probably refers to ______. That genetically modified crops could have harmful effects can be dedu

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问题 The word "this" (Paragraph 1) probably refers to ______.
That genetically modified crops could have harmful effects can be deduced from the fact that ______.
选项 A、gene movement between cultivated plants and wild ones is inevitable
B、new research shows that genetically modified plants are likely to develop into weeds
C、cross-breeding is a natural process
D、hybrids are generally more successful at breeding than natural plants
答案A
解析 这是一道推论题。文章第六段指出：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，这些农作物同它们与之竞争的杂草有着亲密的关系。由此可知，农作物与野生植物之间的杂交会产生有害的后果，而这是难以避免的。A说“被栽培的植物与野生植物之间的基因转变是不可避免的”，这与文章的意思相符。与B有关的信息是第二段的第一句话，文中是说“其结果可能会产生非常耐寒、难于消除的杂草”，这是文中明确指出的，不必推论就可知结果，所以不对；与C有关的信息是第五段的第一句话，文中是说“虽然科学家测试的基因特征是自然生成的，而不是基因合成的”，并不是说杂交是一种自然过程，所以C不对；文中没有提到D。
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