[求助]XDF补充材料最新机考题（五）

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 throught 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: B

想问问不选C的理由是什么？选项是要选一个对结论Such water would be useless in improving physical performance,起支持作用的论据就可以了。C说没有这种水，大牛运动员也一样创纪录。说明无因有果，不也是支持这种水没用的结论吗？有人能给解释解释吗？

我理解，B是从前提--结论的逻辑线去支持的。那么如果没有One of the limiting factors in human physical performance is the amount of oxygen that is absorbed by the muscles from the bloodstream. 是不是就可以说C正确呢？

另外疑惑的是：难道一定要按照前提--结论的逻辑线去支持吗？我记得有些题目是直接支持结论的。

你在“如何在考试时做逻辑题”说：

前提结论关系不密切，可以直接支持结论。可不可以将这句话取非：密切的话就得按逻辑线来支持？

1。该句话不可能去掉，如果去掉的话，水对人体体能的效果机理就不清楚，后面的一切推理都没了支持和批驳的切入点。退一步说，即使去掉，该水好的原因是有extra氧，黑体部分的weaken在于extra氧没用，B正是基于同样的角度去批驳。C却与此无关

2。什麽情况下都可以直接支持结论，密切也好，不密切也好，但要在前提的范围内，在前提的角度上。