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    Yawning sends out certain messages -either “Oh，this movie is so boring” or “I probably need to get some sleep”. But did you know that a yawn can also help your brain to cool down when it is overheated?
    A new study, led by a research team at Princeton University, has indicated that yawning could be the brain’s natural way of regulating temperature. People yawn more often when the temperature outdoors is lower than their body temperature but are less likely to yawn when it is hotter outdoors, according to Sciencedaily. com.
    The research team did an experiment on 160 people, 80 in summer and 80 in winter, to examine how often they yawned at different air temperatures. The study found that people yawned more often in winter than in summer. Scientists say that when the air temperature is lower outside the body, there is heat exchange between the overheated brain and the cool air. But when the air temperature is higher than or equal to the body, people are less likely to yawn because the hot air they breathe in will make the brain even hotter.
    When people yawn, their jaw is also stretched，which increases blood flow and may also help cool the brain
    The study showed that the amount someone yawned could be related to the amount of time they spent outside. The longer they spent outside in summer, the less they yawned. Nearly 40 percent of participants yawned within their first five minutes outside, but after that the percentage was reduced to less than 10 percent.
    However, the result was the opposite in winter. The number of people who yawned increased when they spent more than five minutes outdoors. But the change was only slight compared to summertime.
    According to Gallup, this is the first report to show that yawning frequencies change depending on season. This could help us to understand better the way our brains work. It may also help us understand the reason why frequent yawning can sometimes be a sign of brain disease.
    小题1:The purpose of the experiment is ______.
    A．to find the frequency of people’s yawning
    B．to indicate brain can regulate temperature naturally
    C．to prove people yawn in winter and in summer equally
    D．to show the real reason why people yawn
    小题2:The information we get from Paragraphs 5 and 6 is that ______.
    A．longer outdoor summertime results in more yawns
    B．yawning frequency increases with outdoor time
    C．yawning frequency changes with outdoor time
    D．longer outdoor wintertime leads to fewer yawns
    小题3:Acorrding to the text，people yawn more often ______.
    A．when the air temperature is equal to the body
    B．when the hot air breathed in makes the brain hotter
    C．when the air temperature is higher than the body
    D．when the air temperature is lower outside the body
    小题4:What could be the best title for the text?
    A．Yawning Is A Sign of Brain Disease
    B．Yawning Cools Your Brain
    C．Yawning Benefits Your Body
    D．Yawning Carries Some Information

    小题1:A
    小题2:C
    小题3:D
    小题4:B

    试题分析：文章介绍了一项研究结果，人们多长时间打一次哈欠，研究表明，当外面的温度比身体的温度低的时候，人们就会打哈欠。打哈欠可以让人的大脑冷静下来。
    小题1:细节题：从第三段的句子：The research team did an experiment on 160 people, 80 in summer and 80 in winter, to examine how often they yawned at different air temperatures. 可知这个研究的目的是看人们多长时间打一次哈欠，选A
    小题2:细节题：从第五段的句子:The study showed that the amount someone yawned could be related to the amount of time they spent outside.可知人们打哈欠的时间和在户外是时间有关，选 C
    小题3:细节题：从第二段的句子：People yawn more often when the temperature outdoors is lower than their body temperature but are less likely to yawn when it is hotter outdoors, according to Sciencedaily. com.可知当外面的温度比身体的温度低的时候，人们就会打哈欠。选D
    小题4:标题确定题：从第一段的句子：But did you know that a yawn can also help your brain to cool down when it is overheated?可知打哈欠可以让人的大脑冷静下来。选B
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    科目：高中英语 来源：不详 题型：完形填空

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    科目：高中英语 来源：不详 题型：阅读理解

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