2．It seems hard to watch someone yawn（打哈欠） and not to yawn ourselves．Even reading about yawning can make you do it．Now，a new study has found why yawning has such a powerful force．Yawning when others yawn，the study suggests，is a form of social connection．Kids don't develop this behavior until around age four，the study found．Autistic（患自闭症的）children are less likely to catch yawns．In the most serious cases，they never do．Yawning might help doctors to see whether the children are developing rightly．The work could also lead to a better understanding of the ways that people communicate and connect．
"Emotional（情绪的） effect seems to be a born thing that connects us together，"said Molly Helt，a graduate student at the University of Connecticut．"Yawning may be part of that．"Inspiration for her study came when she tried to get her own autistic son to clear his ears on an airplane．She repeatedly yawned at him，hoping he would yawn back．He never did．
"The fact that autistic kids don't do it might mean they're really missing out on that emotional connection with people around them，"she said．"The biggest thing people try to figure out after birth is how we become humans and understand that humans have minds that are different from others'，"she added．"Autistic people never seem to understand that．"
Like infectious （有感染力的）laughter and crying，scientists have found that yawning is a shared experience that improves social connection．Helt said it could fight stress after a period of being nervous and spread a feeling of calm through a group．
12．According to the passage，which of the following statements is True？B．
A．It is hard to yawn when you see others yawn．
B．Yawning is a form of communication．
C．Autistic children are more likely to catch yawns．
D．Yawning too much does harm to people's health．
13．In her study，Molly Helt has found thatB．
A．people get inspired when they yawn
B．yawning is a kind of emotional connection among humans
C．people only communicate with others by yawning when they are young
D．yawning helps clear ears on planes
14．From the passage，we can know thatD．
A．it is strange to yawn back if people around you yawn．
B．some kids are too young to yawn after others．
C．autistic children yawn easily when others yawn．
D．yawning can be used to test children's development．
15．From the the last paragraph，it can be inferred thatD．
A．yawning is different from infectious laughter and crying
B．it is impolite to yawn on some social occasions
C．yawning is a shared experience that improves social connection
D．yawning can make people feel relaxed．
分析 这篇文章主要讲了打哈欠是怜悯心和社会关系的一种表现形式，会在人与人之间相互传染，打哈欠是人们之间的一种情感交流方式，是人们之间沟通的纽带，打哈欠能使人放松．
解答 BBDD
12：B．细节理解题．根据文章第一、二段的描述可知打哈欠是怜悯心和社会关系的一种表现形式，会在人与人之间相互传染．故A正确．
13：B．细节理解题．结合文章三、四段可知Helt通过患有自闭症的儿子对打哈欠"启而不发"的情况意识到打哈欠是人们之间的一种情感交流方式，是人们之间沟通的纽带．故B正确．
14：D．细节理解题．根据第一段Kids don't develop this behavior until around age four，the study found．以及Yawning might help doctors to see whether the children are developing rightly．可知，打哈欠可以用来检测孩子的成长；故D正确．
15：D．推理判断题．根据Helt said it could fight stress after a period of being nervous and spread a feeling of calm through a group可知答案．故D正确．
点评 考查学生的细节理解和推理判断能力．做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确选择．在做推理判断题时不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．
