求教一道逻辑题的一个选项，好心人戳进来看看

bergkamp91

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?
A. world-class athletes turn in record performances without such water
B. frequent physical exercise increases the body’s ability to take in and use oxygen
C. the only way to get oxygen into the bloodstream so that it can be absorbed by the muscles is through the lungs
D. lack of oxygen is not the only factor limiting human physical performance
E. the water lost in exercising can be replaced with ordinary tap water

为啥D不行呢，D说缺氧并不是制约人physical performance的唯一因素，那也就是说除了缺氧，还有其他因素可以造成limit，所以喝了那个饮料以后，就算它能提供氧，但是还有其他因素造成limit。
也就是说，为什么这个饮料提升不了运动表现呢，因为它不具有除了缺氧意外的其它的突破限制运动表现的能力。

bergkamp91

我自己顶一下~

llmmlemon

正确答案是C 吧。该题的逻辑链是：

条件:肌肉吸收的氧气量是身体机能的制约因素之一。
结论:含氧的水不能提高身体机能。

题干中的黑体部分建立了条件和结论之间的联系（解释为什么补充了氧气还不能提高身体机能？）。D选项说有其他制约因素，并没有将条件和结论联系起来，即：有其他因素也不能得出氧气这个因素就会因此而不起作用。