托福阅读修辞目的题是阅读考试中比较常见的一种题型，tpo则是托福阅读备考最权威的材料，所以托福小编综合二者，为大家集中整理了tpo阅读中考察的修辞目的题及其对应的解析，供大家参考使用。本文带来的是TPO24-2的修辞目的题，一起来看看吧。
TPO24-2 Breathing During Sleep
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During NREM (the phase of sleep in which there is no rapid eye movement) breathing becomes deeper and more regular, but there is also a decrease in the breathing rate, resulting in less air being exchanged overall. This occurs because during NREM sleep the automatic, metabolic system has exclusive control over breathing and the body uses less oxygen and produces less carbon dioxide. Also, during sleep the automatic metabolic system is less responsive to carbon dioxide levels and oxygen levels in the blood. Two things result from these changes in breathing control that occur during sleep. First, there may be a brief cessation or reduction of breathing when falling asleep as the sleeper waxes and wanes between sleep and wakefulness and their differing control mechanisms. Second, once sleep is fully obtained, there is an increase of carbon dioxide and a decrease of oxygen in the blood that persists during NREM.
5. What is the author's purpose in stating that inhaling is like sucking air out of a balloon?
A. To refute the argument that additional effort is necessary for breathing during sleep
B. To argue that REM sleep is more important than NREM sleep
C. To illustrate the difficulty of breathing during sleep
D. To illustrate how blockage of narrow passages can be prevented during sleep
解析：修辞目的题，先看修辞点所在的句子，但原句整个都是一个例子，往前看。前一句仍然在说肌肉relax的事情，因此也是例子，所以看开头，开头说air passage在睡觉期间变了很多紧接着就解释睡觉期间呼吸很难，也就是开头所指的变化是睡觉的时候呼吸变难，所以正确答案是C。A的refute与原文相反;B的比较和D的prevent blockage原文都没说
[3]在NMER(睡觉时没有快速眼部活动的阶段)这个阶段中，呼吸会变得更深更有规律，但是呼吸频率会降低，导致总体空气交换减少。发生这个是因为在NREM睡眠阶段中，自动的新陈代谢系统会独自控制呼吸，身体会利用更少的氧气产生更少的二氧化碳。同时，自动的新陈代谢系统对血液中二氧化碳和氧气的含量反应并不灵敏。在睡眠中呼吸控制的变化会导致两个结果。第一，睡着时呼吸可能会有短暂的停止或减少，因为睡眠者在睡眠和清醒之间徘徊，而这两种状态的控制系统不一样。第二，一旦得到了充足的睡眠，血液中二氧化碳含量升高而氧气含量降低，在NREM阶段也会持续这样。
以上就是托福阅读TPO24-2中的修辞目的题及其解析，大家可以在备考的时候参考复习，希望能够帮助大家的考前准备。最后前程百利祝大家都能取得理想的托福考试成绩。
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