【OG24-630题】According to a study, after a week of high-altitude living, twenty men had slimmed down.The men, middle-aged residents of low-altitude areas, had been taken to a research station at 2,650 meters (8,694 feet) above sea level. They had unrestricted access to food and were forbidden vigorous exercise, yet they lost an average of 1.5 kilograms (3.3 pounds) during their one-week stay. Clearly, the lower availability of oxygen at higher altitudes, or hypobaric hypoxia, can be said to have caused the weight loss, since __________.Which of the following would, if true, most logically complete the argument?_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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According to a study, after a week of high-altitude living, twenty men had slimmed down.The men, middle-aged residents of low-altitude areas, had been taken to a research station at 2,650 meters (8,694 feet) above sea level. They had unrestricted access to food and were forbidden vigorous exercise, yet they lost an average of 1.5 kilograms (3.3 pounds) during their one-week stay. Clearly, the lower availability of oxygen at higher altitudes, or hypobaric hypoxia, can be said to have caused the weight loss, since __________.

Which of the following would, if true, most logically complete the argument?

a decrease in oxygen intake has been shown to depress appetite the men all participated in the same kinds of exercise during their stay the foods available to the men had fewer calories than the foods they usually ate exercise at higher altitudes is more difficult than exercise at lower altitudes is several weeks after returning home, the men still weighed less than they had before the study

正确答案： A

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题干翻译
一些男性被带到海拔2650米的研究站。他们能无限制获取食物且禁止剧烈运动，但在一周停留期内平均减重1.5千克。显然，更高海拔的低氧（hypobaric hypoxia）可被认为导致了体重减轻，因为______。 逻辑链
High altitude hypoxia → Weight loss 问题类型
补充论证（完成论证），本质是增强论证。 推理过程
论点是高海拔低氧导致体重减轻，论据是在高海拔处的男性虽食物获取不受限且无剧烈运动仍减重。需要补充一个能说明低氧和体重减轻之间联系的选项。 选项分析
A选项：氧气摄入量减少已被证明会抑制食欲。说明高海拔低氧（氧气摄入量减少）通过抑制食欲导致体重减轻，建立了低氧和体重减轻的联系，增强论证，当选。 B选项：男性在停留期间都参加了相同种类的运动。题干已表明禁止剧烈运动，且运动相同不能解释低氧与体重减轻关系，无关，排除。 C选项：男性可获取的食物比他们通常吃的食物热量少。这表明可能是食物热量问题导致体重减轻，而非低氧，削弱了低氧导致体重减轻的论点，排除。 D选项：在更高海拔的运动比在更低海拔的运动更困难。但题干强调禁止剧烈运动，运动困难与否和体重减轻及低氧无直接关联，无关，排除。 E选项：回家几周后，男性体重仍比研究前轻。这只能说明体重有变化，但无法说明是高海拔低氧导致的，无关，排除。

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