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 by 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 cells can absorb
C. world-class athletes turn in record performances 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
key is B, can sb translate the last sentence into chinese? thx
能不能解释一下这道题？
顺便说一下，这题感觉好奇怪啊~是BF题吗？好像又不太像。。。
这是boldface和support题目相结合
首先要判断boldface的作用，support main conclusion
其次，就是寻找同样support的evidence，一石二鸟
这个题的关键点是 肌肉从血液中吸收的氧气
削弱这个，一是，只有通过肺
二是 血液中的氧气已经足够肌肉吸收了，达到饱和状态了
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 by 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?（选项要支持新水没有用，反对新水有用）
A. the water lost in exercising can be replaced with ordinary tap water(无关，讨论的是氧气吸收问题，不是水)
B. the amount of oxygen in the blood of people who are exercising is already more than the muscle cells can absorb(不吸收，所以没有用)
C. world-class athletes turn in record performances without such water（无关，跟水无关）
D. frequent physical exercise increases the body’s ability to take in and use oxygen（方向反了，支持了新水有用）
E. lack of oxygen is not the only factor limiting human physical performance（无关，和performance无关）
key is B, can sb translate the last sentence into chinese? thx
这题挺难有怪，为什么没有多少人来讨论？
难道大家都觉得很简单？！！！
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(结论), however, since
the only way to get oxygen into the bloodstream so that it can be absorbed by the muscles is through the lungs（支持结论的理由）.
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(无关)
B.
the amount of oxygen in the blood of people who are exercising is already more than the muscle cells can absorb（支持结论）
C.
world-class athletes turn in record performances without such water（无关）
D.
frequent physical exercise increases the body’s ability to take in and use oxygen（无关）
E. lack of oxygen is not the only factor limiting human physical performance（无关）
关键有一点...B可以理解为,反正喝水也吸收不了氧气(因为要靠肺才有用),即便能被你吸收,你需要的氧也饱和了,无法给你肌肉.
这样两者就同方向支持水无用的结论了.
我当时还想..氧气吸都吸不进去了.肌肉能不能吸收又有什么用呢.就当无关给排除了..
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