【OG24-698题】Humans get Lyme disease from infected ticks. Ticks get infected by feeding on animals with Lyme disease, but the ease of transmission from host animal to tick varies. With most species of host animal, transmission of Lyme disease to ticks is extremely rare, but white-footed mice are an exception, readily passing Lyme disease to ticks. And white-footed mouse populations greatly expand, becoming the main food source for ticks, in areas where biodiversity is in decline.The information in the passage most strongly supports which of the following?_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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Humans get Lyme disease from infected ticks. Ticks get infected by feeding on animals with Lyme disease, but the ease of transmission from host animal to tick varies. With most species of host animal, transmission of Lyme disease to ticks is extremely rare, but white-footed mice are an exception, readily passing Lyme disease to ticks. And white-footed mouse populations greatly expand, becoming the main food source for ticks, in areas where biodiversity is in decline.

The information in the passage most strongly supports which of the following?

In areas where many humans are infected with Lyme disease, the proportion of ticks infected with Lyme disease is especially high. Very few animals that live in areas where there are no white-footed mice are infected with Lyme disease. Humans are less at risk of contracting Lyme disease in areas where biodiversity is high. Ticks feed on white-footed mice only when other host species are not available to them. The greater the biodiversity of an area, the more likely any given host animal in that area is to pass Lyme disease to ticks.

正确答案： C

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题干翻译
莱姆病从宿主动物到蜱的传播难易程度各不相同。对于大多数宿主动物物种来说，莱姆病传播给蜱极为罕见，但白足鼠是个例外，容易将莱姆病传播给蜱。并且在生物多样性下降的地区，白足鼠数量大幅增加，成为蜱的主要食物来源。 逻辑链
Bio diversity↓ → White footed mice↑ → Ticks get Lyme↑ 问题类型
推理题 推理过程
生物多样性下降会使白足鼠数量增加，而白足鼠容易将莱姆病传播给蜱，进而可能影响人类感染莱姆病的风险。所以可以从生物多样性与白足鼠、蜱以及莱姆病传播的关系来推断。 选项分析
A选项：在许多人感染莱姆病的地区，感染莱姆病的蜱的比例特别高。题干未提及人感染莱姆病地区和蜱感染比例的直接联系，无法推出，排除。 B选项：在没有白足鼠的地区，很少有动物感染莱姆病。题干没有关于没有白足鼠地区动物感染情况的信息，排除。 C选项：在生物多样性高的地区，人类感染莱姆病的风险较低。因为生物多样性高时白足鼠数量可能不会大幅增加，蜱从白足鼠感染莱姆病的机会减少，人类感染风险也可能降低，符合推理，当选。 D选项：蜱只有在没有其他宿主物种时才以白足鼠为食。题干未提及蜱选择食物的这种条件关系，排除。 E选项：一个地区的生物多样性越高，该地区任何给定的宿主动物将莱姆病传播给蜱的可能性就越大。与原文逻辑相悖，原文是生物多样性下降白足鼠才容易传播莱姆病给蜱，排除。

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