GWD 21-33

fedora

在匯總連結中沒找到這題討論，正確答案是B，但為什麼D不行呢？Thanks.

GWD21-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 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

yaozo

原文的结论是说这种水没用，黑体字是没用的原因。因此答案要选一个喝这种水没用的原因。只有B合适。