新prep 2 99

CD用户363773 · 发表于 2009-12-4 13:40:53

99. (28160-!-item-!-188;#058&002834) (GWD 21-Q33)

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

答案是C，没弄明白，请大家讨论一下

CD用户363773 · 发表于 2009-12-4 13:43:23

我选了A。不过现在想想的确a有问题。运动员没有用不代表这种水一定没用。C说只能通过肺不能通过喝水的方式的确说明了这水没有用处。

milichen · 发表于 2009-12-31 16:02:11

黑体字的意思是这种水没用，因为血液中的氧气已经高于肌肉能吸收的。c选项同样表达了水没用，因为能为肌肉吸收的氧气进入血液的唯一途径是肺。

新prep 2 99

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