【OG24-700题】Professor: A marine biologist argues that transmission of sea lice from farm salmon to wild salmon is unlikely in the Broughton Archipelago, British Columbia, citing numerous studies suggesting that salinities less than 30 parts per thousand are unfavorable to sea-lice survival. The biologist concludes that the archipelago's 25–30 parts per thousand salinity range between March and June, the critical period for wild salmon migration, tends to suppress sea-lice proliferation. But a review of the literature shows that salinities of 25–30 parts per thousand in combination with British Columbia's cool spring temperatures favor the flourishing of sea lice. In this passage, the professor attempts to undermine the biologist's argument by_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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Professor: A marine biologist argues that transmission of sea lice from farm salmon to wild salmon is unlikely in the Broughton Archipelago, British Columbia, citing numerous studies suggesting that salinities less than 30 parts per thousand are unfavorable to sea-lice survival. The biologist concludes that the archipelago's 25–30 parts per thousand salinity range between March and June, the critical period for wild salmon migration, tends to suppress sea-lice proliferation. But a review of the literature shows that salinities of 25–30 parts per thousand in combination with British Columbia's cool spring temperatures favor the flourishing of sea lice.

In this passage, the professor attempts to undermine the biologist's argument by

pointing out that a condition claimed to be necessary for sea-lice survival is not sufficient for it citing studies that suggest that salinity levels were not measured reliably claiming that there is evidence showing that one of its premises is false questioning the reliability of the biologist's scientific sources showing that its conclusion is inconsistent with its premises

正确答案： C

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题干翻译
不列颠哥伦比亚省的布劳顿群岛，引用众多研究表明盐度低于千分之30不利于海虱生存。生物学家得出结论，在野生鲑鱼洄游的关键时期3月至6月，群岛千分之25 30的盐度范围往往会抑制海虱繁殖。但文献回顾显示，千分之25 30的盐度与不列颠哥伦比亚省凉爽的春季温度相结合有利于海虱繁衍。 逻辑链
Biologist：<30‰ salinity → suppress sea lice Professor：25 30‰ salinity + cool temp → favor sea lice 问题类型
削弱（undermine） 推理过程
生物学家依据盐度低于30‰不利于海虱生存，得出25 30‰盐度抑制海虱繁殖的结论；教授指出25 30‰盐度结合凉爽温度有利于海虱繁衍，说明生物学家所依据的前提（仅考虑盐度对海虱的影响）存在错误。 选项分析
A选项：题干未提及海虱生存的必要条件和充分条件相关内容，与教授削弱生物学家论点的方式无关，排除。 B选项：题干未讨论盐度测量是否可靠，排除。 C选项：教授指出存在证据（25 30‰盐度结合凉爽温度有利于海虱繁衍）表明生物学家的前提（仅考虑盐度对海虱生存的影响）是错误的，符合教授削弱方式，当选。 D选项：教授未质疑生物学家科学来源的可靠性，排除。 E选项：生物学家的结论并非与前提不一致，教授是指出其前提不全面，排除。

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