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judyenglish

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？！！！

judyenglish

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）

vickyye

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..

yinhang_1217

D也是削弱？为什么不好呢？请教NN。

denglin0729

原文第一句话看似和B选项相矛盾,实际上并非.第一句话的意思是:人的体能表现有一个限制因素是肺从血液中能够吸收的氧气量.而B选项是说运动的人,他们血液中的氧气量已经超过了肌肉细胞能够吸收的量.暗含的意思是这个限制因素不是氧气量少了,关键是肺能吸收的多少.所以B选项解释了这个新水的作用是无效的,它只能增加溶解到水中的氧气,并不能增加肺对氧气的吸收量.
D选项是支持.

sallyruru

支持17楼~

原落纪

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.

肌肉需要从血液中吸收氧气。因此有一种方法，就是往喝的水里加氧。但是这种方法没用，因为肌肉需要的那种氧气进入血液的唯一渠道是通过肺而不是喝水。

Which of the following, if true, would serve the same function in the argument as the statement in boldface?
问同样功能，那就是问解释补加氧水没用的另一原因是什么。

A.    the water lost in exercising can be replaced with ordinary tap water（支持加氧水的作用而不是削弱）
B.    the amount of oxygen in the blood of people who are exercising is already more than the muscle cells can absorb（解释喝水没用的另一原因，是肌肉不缺氧，氧已经足够了，不需要再补充）
C.    world-class athletes turn in record performances without such water（说的是水不管用这一现象，并没有像加粗部分那样解释不管用的原因）
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（与运动表现无关）