求助GWD21-Q33

doudouzhu

One of the limiting factor in human physical performance is the amount of oxygan that is absorbed by the  muscles form the bloodstream. Accordingly, entrepreneurs have begun selling at gymnasiums and health clubs bottles of drinking water, labeled "Super OXY'" that has extra oxygen dissolved in teh 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 execrising is already more than the muscle cells can absorb.

c. world-class athletes turn in record perfomances 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

正确答案是B。

这是一个什么类型的题，这样的题有什么好的方法去做吗？

谢谢大家了

qwenoyes

7楼正解啊！！

zqjoy9

我认为这道题的最好的解题方法就是把BF部分的逻辑链一步步分析清楚：

这道题的BF实际说了这样一个意思：

肺部是氧气进入血液的唯一方式——只要呼吸，就有氧气进入血液【言下之意，氧气中的血液一直是充足的，因为人不可能停止呼吸；同时E中所说的缺氧也可排除，因为不可能存在缺氧状况】——但是题目中第一句话已经说了，肌肉吸收血液中的氧气是有有个限度的——因此体力不支不是因为缺氧，而是因为肌肉已达到其吸氧极限，这句话不就是B选项嘛~~

抓住一个重点：体力不支不是因为缺氧！！血液里的氧气充足的很！！而是因为肌肉吸氧已经达到饱和状态啦！！血液里面氧气再充足肌肉也吸收不了啦！！

zoemiaoer

其实划线的部分就是用来说明不是给的越多越好，而是能够吸收多少

muhuiyun777

这题目其实不简单，前面useless标明这种饮料对于physical performance的无用，however后面表转折并暗示还是有用的，题目问的是和BOLDFACE同样FUNCTION的地方，应该是选饮料对physical performance有用的选项，选B又恰恰反映了muscle还是不大吸收，有点怪，很绕，不知看客能否明白我的意思
OPEN TO DISCUSS

ryanxie

说的是Function，所以我们就看这句话是什么 Logic Function( Premise/Conclusion/Cause/Effect/etc...)，然后按图索骥即可。其实也是逻辑结构认知的题，和经典的逻辑结构类比的题一样。

张大猴

最后一句话是支持 water would be useless in improving physical performance这句话，削弱这句话之前的内容，找到与它相同的function的选项就对了

doudouzhu

不好意思，划线部分是从since the only to get oxygen ......到最后。就是最后半句话。