Question

阅读下面的短文，从每题所给的四个选项(A、B、C和D)中选出最佳选项。 　　Latest research shows that yawning helps in keeping the brain cool, which is quite different from the popular belief that yawning promotes sleep and is a sign of tiredness． 　　Yawning involves opening the mouth while taking a long, deep breath of air．It is commonly believed that people yawn as a result of being sleepy or tired because they need oxygen．However, researchers at the University of Albany in New York said their experiments on 44 students showed that drawing in air helps cool the brain and helps it work more effectively．They said that their experiments showed that raising or lowering oxygen and carbon dioxide levels in the blood did not produce that reaction． 　　Study participants were shown videos of people laughing and yawning, and researchers counted how many times the volunteers responded to their own “contagious(传染性的)yawns,” reported the online edition of BBC News．The researchers found that those who breathed through the nose rather than the mouth were less likely to yawn when watching a video of other people yawning．This was because the blood vessels(脉管)in the nasal cavity sent cool blood to the brain． 　　The same effect was found among those who held a cool pack to their forehead, whereas those who held a warm or room－temperature pack yawned while watching the video． 　　“Since yawning occurs when brain temperature rises, sending cool blood to the brain serves to maintain the best levels of mental efficiency,” the authors wrote in the journal Evolutionary Psychology． (1) According to the new study, people yawn when ________． [　　] A． they are sleepy or tired B． they need more oxygen C． their brain temperature rises D． oxygen levels in the blood are lowered (2) Which of the following statements about the new study is NOT true? [　　] A． Yawning can promote sleep． B． The study was carried out by researchers at the University of Albany． C． Yawning can make our brain work more efficiently． D． Yawning can maintain the best levels of mental efficiency． (3) The underlined phrase “the volunteers” probably refers to ________． [　　] A． study participants B． people laughing and yawning C． researchers D． videos (4) In which section of a newspaper can you read this passage? [　　] A． Science and technology． B． Health． C． Entertainment． D． Culture．

Answer 1

答案：1．C;2．A;3．A;4．B;
解析：

(1)	细节理解题。由最后一段第一句Yawning occurs when brain temperature rises可得到答案。A：是人们对打哈欠的过去的看法。B：缺氧的时候，导致的结果是：sleepy or tired而不是打哈欠。D：第二段最后一行：oxygen and carbon dioxide levels in the blood did not produce that reaction。
(2)	细节理解题。A是过去人们对打哈欠的误解，不是最新研究结果，因此不正确。B是这项研究的执行者。C、D是最新的研究发现。
(3)	词意猜测题。根据上文：the volunteers指的是A。
(4)	推理判断题。根据文章内容来看，与health关系最密切．该文是对打哈欠进行了研究，但是，这项研究和科学技术无关，故不能选A。