Which of the sentences below best expresses the ess装控难世李减倒ential in...
Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.· A. It is the conventional theory that when people are bored or sleepy, they often experience a drop in blood oxygen levels due to their shallow breathing.· B. The conventional theory is that people yawn when bored or sleepy because yawning raises blood oxygen levels, which in turn raises alertness.· C. According to conventional theory, yawning is more likely to occur when people are bored or sleepy than when they are alert and breathing deeply.· D. Yawning, according to the conventional theory, is caused by boredom or lack of sleep and can be avoided through deeper breathing.该题您未回答:х 该问题分值: 2A、 B、 C、
首段着重强调的句子意思是“根据传统理论，人们在感到枯燥或者困倦的时候会打哈欠，通过加深呼吸，提高缺乏睡眠或者枯燥时浅呼吸导致的较低计胶风目卫跑灯甚众氢血液氧气含量，从而提高警觉性。”所以B正确。A项缺失了原文的“reversing”部来自分；C项的比较是原文没有的；D项中的“can be avoided”原文没有提及。
