【OG24-717题】Certain groups of Asian snails include both “left-handed” and “right-handed” species, with shells coiling to the left and right, respectively. Some left-handed species have evolved from right-handed ones. Also, researchers found that snaileating snakes in the same habitat have asymmetrical jaws, allowing them to grasp right-handed snail shells more easily. If these snakes ate more right-handed snails over time, this would have given left-handed snails an evolutionary advantage over right-handed snails, with the left-handed snails eventually becoming a new species. Thus, the snakes' asymmetrical jaws probably helped drive the emergence of the left-handed snail species.Which of the following would, if true, most strengthen the argument that asymmetrical snake jaws helped drive left-handed snail evolution?_mofa留学圈mofaGRE在线题库系统_GRE在线搜题_GRE题库解析_GRE真题机经_GRE课程_GRE培训机构

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Certain groups of Asian snails include both “left-handed” and “right-handed” species, with shells coiling to the left and right, respectively. Some left-handed species have evolved from right-handed ones. Also, researchers found that snaileating snakes in the same habitat have asymmetrical jaws, allowing them to grasp right-handed snail shells more easily. If these snakes ate more right-handed snails over time, this would have given left-handed snails an evolutionary advantage over right-handed snails, with the left-handed snails eventually becoming a new species. Thus, the snakes' asymmetrical jaws probably helped drive the emergence of the left-handed snail species.

Which of the following would, if true, most strengthen the argument that asymmetrical snake jaws helped drive left-handed snail evolution?

In one snake species, the snakes with asymmetrical jaws eat snails, while the snakes with symmetrical jaws do not eat snails. Some species of Asian snails contain either all right-handed snails, or all lefthanded snails. Anatomical differences prevent left-handed snails from mating easily with right-handed snails. Some right-handed snails in this habitat have shells with a very narrow opening that helps prevent snakes from extracting the snails from inside their shells. Experiments show that the snail-eating snakes in this habitat fail more often in trying to eat left-handed snails than in trying to eat right-handed snails.

正确答案： E

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题干翻译
一些左撇子物种是从右撇子物种进化而来的。而且，研究人员发现，在同一栖息地的食蜗牛蛇有不对称的下颚，这使它们更容易抓住右旋蜗牛壳。如果这些蛇随着时间的推移吃了更多的右旋蜗牛，这将使左旋蜗牛比右旋蜗牛具有进化优势，左旋蜗牛最终会成为一个新物种。因此，蛇的不对称下颚可能推动了左旋蜗牛物种的出现。 逻辑链
Asymmetrical jaws → Left handed snail evolution 问题类型
增强题 推理过程
论点是蛇的不对称下颚推动了左旋蜗牛物种的进化，论据是蛇的不对称下颚利于抓右旋蜗牛，若吃更多右旋蜗牛，左旋蜗牛有进化优势。要增强论点，需找到能进一步说明蛇的不对称下颚和左旋蜗牛进化之间联系的选项。 选项分析
A选项：一种蛇中，不对称下颚的蛇吃蜗牛，对称下颚的蛇不吃蜗牛。只说明了不同下颚的蛇吃蜗牛的情况，未涉及与左旋蜗牛进化的联系，无法增强，排除。 B选项：一些亚洲蜗牛物种要么全是右旋蜗牛，要么全是左旋蜗牛。与蛇的不对称下颚和左旋蜗牛进化没有直接关联，无法增强，排除。 C选项：解剖学差异使左旋蜗牛和右旋蜗牛不易交配。讨论的是蜗牛交配问题，与蛇的不对称下颚推动左旋蜗牛进化无关，无法增强，排除。 D选项：栖息地的一些右旋蜗牛壳开口很窄，防止蛇把它们从壳里弄出来。说的是右旋蜗牛自身防御，未涉及与左旋蜗牛进化及蛇不对称下颚的关系，无法增强，排除。 E选项：实验表明，该栖息地的食蜗牛蛇尝试吃左旋蜗牛比尝试吃右旋蜗牛失败次数更多。说明蛇更难吃到左旋蜗牛，结合论据中蛇吃更多右旋蜗牛，就更能体现左旋蜗牛的进化优势，从而增强了蛇的不对称下颚推动左旋蜗牛进化这一论点，当选。

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