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题库 / GMATLA-CR-124
One of the limiting factors in human physical performance is the amount of oxygen that is absorbed by the muscles from the bloodstream. Accordingly, entrepreneurs have begun selling at gymnasiums and health clubs bottles of drinking water, labeled "SuperOXY," that has extra oxygen dissolved in the water. Such water would be useless in improving physical performance, however, since the amount of oxygen in the blood of someone who is exercising is already more than the muscle cells can absorb.
Which of the following, if true, would serve the same function in the argument as the statement in boldface?
world-class athletes turn in record performances without such water
frequent physical exercise increases the body's ability to take in and use oxygen
the only way to get oxygen into the bloodstream so that it can be absorbed by the muscles is through the lungs
lack of oxygen is not the only factor limiting human physical performance
the water lost in exercising can be replaced with ordinary tap water
情景：略
推理：本题算问法比较特殊的黑脸题，要求我们五个选项中找到一个同黑体字的作用相同的选项。实际上，通过分析推理文段可知，黑体字是Such water would be useless in improving physical performance的原因，因此我们去找Such water would be useless in improving physical performance的另外一个原因即可。
选题方式：略
选项分析：
A选项：世界级运动员不喝这样的水也能达到创记录的表现。本选项不能解释为什么这些水没用，因为运动员不喝也可以，不代表喝了没用。
B选项：高频率的体育运动可以增加身体摄入和用氧的能力。这是人体吸收氧的原理，不能说明结论的产生。
C选项： Correct. 人体唯一能吸收氧并让其进入血液而最终被肌肉吸收的方式就是通过肺。显然本选项可以解释为什么喝氧没用。
D选项：缺氧并非影响人们运动能力的唯一因素。本选项讨论的是缺氧的原理，不是另外一个原因。
E选项：在运动中丢失的水可以直接用普通自来水来弥补。本选项是“补充”水的原理，不能说明为什么XYO水没用。
寻找same function的句子，即能够说明Such water would be useless in improving physical performance的句子
A选项只是说不喝这个水也可以，没有直接说明没用；E选项也是没有直接说明；只有C选项，明确指出只能通过肺来吸收，因此喝了没用
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