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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
A. pointing out that a condition claimed to be necessary for sea-lice survival is not sufficient for it
B. citing studies that suggest that salinity levels were not measured reliably
C. claiming that there is evidence showing that one of its premises is false
D. questioning the reliability of the biologist's scientific sources
E. showing that its conclusion is inconsistent with its premises
翻译:
教授:一位海洋生物学家认为,在不列颠哥伦比亚省的Broughton Archipelago,海虱不可能从养殖鲑鱼传染给野生鲑鱼,他引用了许多研究,表明盐度低于千分之三十对海虱的生存是不利的。这位生物学家总结说,群岛在3月至6月期间的千分之二十五至千分之三十的盐度范围,即野生鲑鱼迁移的关键时期,往往会抑制海虱的繁殖。但是,对文献的审查表明,千分之二十五到三十的盐度与不列颠哥伦比亚省春季的凉爽温度相结合,有利于海虱的繁衍。
在这段话中,教授试图通过以下方式来削弱生物学家的论点
A. 指出一个声称是海虱生存的必要条件并不充分
B. 引述研究表明盐度水平的测量并不可靠
C. 声称有证据表明其前提之一是错误的
D. 质疑该生物学家的科学来源的可靠性
E. 显示其结论与前提不一致
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针对楼主的问题,讨论如下:
A不正确的地方在于,该生物学家未涉及海虱生存的”必要“条件,只是提到”一个“条件:低盐不利于海虱生存
C:conclude后面包括:前提(之一)低盐抑制海虱的繁殖;之前的研究表明的也是前提:低盐不利海虱繁殖
实情是:低盐与温度结合,有利于海虱繁衍
是(促进或抑制)海虱繁殖的前提错,即低盐起不到抑制海虱繁衍的作用
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