文章解析
第一句: Orcas are small whales that generally travel in groups called pods. 白话版讲解: 虎鲸(orcas)是一种体积较小的鲸鱼,它们往往成群游走,结伴而行。 第二句: Orcas that feed on marine mammals travel in very small pods, while those that feed on fish travel in relatively large pods. 白话版讲解: 以海洋哺乳动物为食的虎鲸总是组成小型队伍出行;而以鱼类为食的虎鲸,它们出行队伍的规模相对来说要大一些。 第三句: Since a larger pod has an increased collective ability to locate prey, it is likely that orcas that feed on mammals travel in small pods only because the mammals that they hunt can more easily detect a large pod and escape it. 白话版讲解: 因为队伍规模大意味着虎鲸通过集体的智慧能够更好地发现猎物,所以以海洋哺乳动物为食的虎鲸,它们之所以组成小型队伍出行,仅仅是因为这些猎物能够更轻易地发现大型队伍,并且逃脱它们的追捕。题目解析
1.Which of the following, if true, most strongly indicates that the conclusion is too sweeping? A. Orcas that feed on fish almost always remain in the pod into which they were born, while orcas that feed on mammals will form new pods if the one they are in becomes too big. B. No orcas have been observed to switch back and forth between feeding on fish and feeding on mammals. C. Pods of orcas generally include at least on mother and one or two of her offspring. D. Unlike marine mammals, fish generally travel in large schools, which can provide food for large pods of orcas. E. Individuals from different pods interact frequently, and pods are small, such interaction predominantly foraging activities.(下方查看答案)
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这道题问的是,以下哪个选项能够表明原文的结论太笼统了,站不住脚? 这道题本质上是一道削弱题,需要找出能够推翻文章结论的选项。原文的结论,以海洋哺乳动物为食的虎鲸,它们之所以组成小型队伍出行,仅仅是因为这些猎物能够更轻易地发现大型队伍,并且逃脱它们的追捕。想要推翻这个结论,就要表明虎鲸组成小型队伍出行的原因不止文章里提到的这一个。所以这道题应该选 A。 A. 以鱼为食的虎鲸会一直待在自己所在的队伍里;而以海洋哺乳动物为食的虎鲸一旦发现自己所在的队伍规模太大,就会离开过去的大队伍,组成新的小队伍。(这个选项表明以海洋哺乳动物为食的虎鲸,其形成小队伍的原因不仅只有文章提到的那个。从而可以削弱原文的结论。) B. 没有虎鲸的饮食习惯会在以鱼类为食和以哺乳动物为食之间来回转换。 C. 虎鲸队伍中往往会包括至少一只虎鲸妈妈和一到两只虎鲸宝宝。 D. 和海洋哺乳动物不同的是,鱼类往往成群出行,从而为队伍规模大的虎鲸(也就是以鱼类为食的虎鲸)提供食物。 E. 来自不同队伍的虎鲸会有互动,而在规模比较小的虎鲸队伍里,这样的互动主要是为了觅食。