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  3. 　　Yawning can be a problem at the office for Lindsay Eierman, which makes her embarrassed. "I’ ve explained, ’I’m sorry, I didn’

　　Yawning can be a problem at the office for Lindsay Eierman, which makes her embarrassed. "I’ ve explained, ’I’m sorry, I didn’

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问题 　　Yawning can be a problem at the office for Lindsay Eierman, which makes her embarrassed. "I’ ve explained, ’I’m sorry, I didn’ t get much sleep last night,’" says Ms Eierman, a 26-year-old social worker from Durham, North Carolina. But a lack of sleep may not be the problem.
    Researchers are starting to unravel the mystery surrounding the yawn, one of the most common and often embarrassing behaviours. Yawning, they have discovered, is much more complicated than previously thought. Although all yawns look the same, they appear to have many different causes and to serve a variety of functions.
    Yawning is believed to be a means to keep our brains alert in times of stress. Contagious yawning appears to have evolved in many animal species as a way to protect family and friends, by keeping everyone in the group vigilant. Changes in brain chemistry trigger yawns, which typically last about six seconds and often occur in clusters.
    To unravel the mystery of yawning, scientists built upon early, observed clues. Yawning tends to occur more in summer. Most people yawn upon seeing someone else do it, but infants and people with autism or schizophrenia aren’ t so affected by this contagion effect. And certain people yawn at surprising times, like parachutists who are about to jump out of a plane or Olympic athletes getting ready to compete.
    A leading hypothesis is that yawning plays an important role in keeping the brain at its cool, optimal working temperature. The brain is particularly sensitive to overheating, according to Andrew Gallup, an assistant professor of psychology at the State University of New York at Oneonta. Reaction times slow and memory wanes when the brain’ s temperature varies even less than a degree from the ideal 98.6 degrees Fahrenheit.
    There are some practical applications. Dr. Gallup said managers might want to keep in mind the brain-cooling role of yawning when a meeting is long and boring. "One way to diminish yawning frequency in an office would be to keep it air-conditioned. If it’ s very cold in the room, yawning rates are going to be quite low," Dr. Gallup said.
According to Paragraph 3, which of the following is NOT true about yawning?
选项 A、It always happens in groups.
B、It makes people relax under pressure.
C、It is caused by changes in brain chemistry.
D、It usually lasts approximately six seconds.
答案B
解析 细节题。根据题干关键词定位到第三段。第三段第一句意为“打哈欠可以让我们在感受到压力的时候使大脑处于警觉状态”，B项中的makes people relax和第一句中的keep our brains alert矛盾，符合题意，故B项为正确答案。A项中的always happens in group与原文often occur in clusters是同义替换，C项中的is caused by与原文trigger是同义替换，D项中的usually lasts approximately与原文typically last about是同义替换，三项均符合原文，故排除。
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