Tpo24阅读分析(6)

6. All of the following are mentioned in paragraph 4 as being characteristic of breathing during sleep EXCEPT

○relaxation of the muscles involved in the respiratory system

○changes in resistance between the two sides of the nose

○easier airflow in the passages of the upper airway

○absence of certain complex muscle interactions

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A的relaxation of the muscles做关键词定位至第三句，正确；B的two sides of the nose做关键词定位至倒数第三句，正确；C的upper airway做关键词定位至第三句，但答案的easier airflow原文完全没说，C错，选；D的complex muscle interaction做关键词都定位至最后一句，正确，不选

(3)

paragraph5: Other respiratory regulating mechanisms apparently cease functioning during sleep. For example, during wakefulness there is an immediate, automatic, adaptive increase in breathing effort when inhaling is made more difficult (such as breathing through a restrictive face mask). This reflexive adjustment is totally absent during NREM sleep. Only after several inadequate breaths under such conditions, resulting in the considerable elevation of carbon dioxide and reduction of oxygen in the blood, is breathing effort adjusted. Finally, the coughing reflex in reaction to irritants in the

irritation is severe enough, a sleeping person will arouse, clear the airway, then resume breathing and likely return to sleep.