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
E. lack of oxygen is not the only factor limiting human physical performance
答案是A？我不同意！NN说说！
我觉得此题不好，要推出的隐含条件不确定，不如原文的隐含条件是superxoyZ只能用来喝--〉只能影响血液不能影响和呼吸有关的氧含量。另外该题所有的人都仅限定于在健身的人。
如果我接受以上假设的话，我会选择B
choose B
bold face的作用是：支持“SuperOXY is useless in providing oxygen to mussles"
B的作用是“不需要SuperOXY的oxygen" => "SuperOXY is useless in providing oxygen to mussles"
A的作用是“不需要SuperOXY的水“
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