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  3. The word "this" (Paragraph 1) probably refers to ______. According to the text, genetic engineering can be used to ______.

The word "this" (Paragraph 1) probably refers to ______. According to the text, genetic engineering can be used to ______.

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问题 The word "this" (Paragraph 1) probably refers to ______.
According to the text, genetic engineering can be used to ______.
选项 A、kill weeds through cross-breeding
B、make crops hardier
C、improve the yield and quality of most crops
D、make crops resistant to chemical fertilizers
答案B
解析 这是一道细节题。文章第一段指出：研究人员发现，当一种杂草与农场栽培的农作物类植物杂交时，它就因此获得新的基因特征——可能包括使庄稼更耐寒的人工合成基因。这说明，基因工程可以被用来使庄稼更耐寒。B说“使得农作物更耐寒”，这与文章的意思相符。与A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”，说明A与之相反：文中没有提到C和D。
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