GWD 21-33
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 only way to get oxygen into the bloodstream so that it can be absorbed bye the muscles is through the lungs.
Which of the following, if true, would serve the same function in the argument as the statement in boldface?
A. the water lost in exercising can be replaced with ordinary tap water
B. the amount of oxygen in the blood of people who are exercising is already more than the muscle can absorb
C. world-class athletes turn in record performance without such water
D. frequent physical exercise increases the body’s ability to take in and use oxygen (A)
E. lack of oxygen is not the only factor limiting human physical performance
文中只提到oxygen与exercise performance 的关系，water lost 与exercise performance 更像是我们自己猜想的。B, indicating the bottleneck the oxygen absorbing process is limited at the absorption of the muscle from blood stream, not by the amount of the oxygen supply to the body, clearly says the Oxygen is useless in inproming the performance.
个人倾向于B, 大家呢？ To be discussed.
我认为B比较好
原文要说的＂SUPERＯＸＹ＂没用是指Such water would be useless in improving physical performance, 而文章前面指出the limiting factors in human physical performance is the amount of oxygen that is absorbed by the muscles from the bloodstream. 由此可知＂SUPERＯＸＹ＂没用是指补充oxygen方面的,而没有提到补水的作用.
而B中说明了,oxygen不足是因为muscle can not absorb 所以进一步证明了用"Super OXY"补氧是没用的,也就和boldfold 的function 一样了
也在A和B见徘徊，最终选择A.
文中说SUPER没有效果，举出了一个原因（也就是BOLDFACE这句），而我们需要在选项中找出第二个原因。
选A加上BOLDFACE，正好意思是说：在健身房卖SUPER没有用，因为：一、补水的话，一般的饮用水就可以了（选项A），二、补氧的话，只有通过肺才是唯一途径（BOLDFACE）。所以无论从哪方面来说，这个SUPER都是USELESS的
同意B是无关项。但是觉得A也是比较牵强，虽然也加强了super没有必要，但是和文中的关键词或中心意思都没有什么直接关系。原文的重点是要反驳“SuperOXY has extra oxygen dissolved in the water” 其实没有必要。
A. the water lost in exercising can be replaced with ordinary tap water
感觉不正确,原题目是要证据显示:
Such water would be useless in improving physical performance,
A只是说water lost可以被补充,
而B同样可以得出结论,such water would be useless.
A. the water lost in exercising can be replaced with ordinary tap water(无关项)
B. the amount of oxygen in the blood of people who are exercising is already more than the muscle can absorb(正确,指出再多无益.SO 那种饮料就没有市场了)
C. world-class athletes turn in record performance without such water(无关项,一般与权威人士相关也就无关了)
D. frequent physical exercise increases the body’s ability to take in and use oxygen (无关项)
E. lack of oxygen is not the only factor limiting human physical performance(已包含文中第一句)
A选项：普通水就行，不能证明extraOXY就不行。
不能因为A有用，就否定B的作用。
同意B
服从多数，B! 
SuperOXY的卖点是增加氧含量，不是补充水分。所以A是无关项。
B正确
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