【文章大意】本文介绍了睡眠好，人就有魅力，精力充沛。而且人们喜欢和看起来有魅力的人交往。

　　36. B【解析】推理判断题。根据The strangers were good at judging if the person they were looking at was tired, and, if they were sleepy, their attractiveness score was low.可知研究人员要求陌生人去判断照片上的人是否疲倦的，是否困倦的，是否有魅力，因此他们没有判断是否有很多朋友，故选B。

　　37. D【解析】推理判断题。根据An unhealthy-looking face makes people run away. In other words, people don’t want to hang around with people who might be ill.可知陌生人不想和那些看起来不健康的人交朋友，因此他们是想和那些有魅力的和精力充沛的人交朋友，故选D。

　　38. C【解析】词义猜测题。根据An unhealthy-looking face makes people run away.可知看起来疲倦的人会把人吓跑，因此人们不愿意和那些疲倦的人交朋友和交往，故选C。

　　39. A【解析】标题归纳题。根据Beauty sleep is a real thing, researches have shown that people who have enough sleep look more attractive (有魅力的) to others.可知本文主要介绍了美容觉让人看起来更有魅力，所以选A。

　　【点睛】根据题干要求，在文中寻找答案所在的语句或段落，进行分析理解，词义猜测，推理判断和概括归纳，选出正确的选项。例如小题1，根据They were asked to get a good night’s sleep for two nights.A week later, they were asked to sleep for only four hours every night for two nights in a row.和The researchers took make-up free (素颜) photos of the volunteers after both the good and the bad sleep.可知研究人员给志愿者拍照，是在他们有两晚上好的睡眠和两晚上不好的睡眠之后进行的，故选D。

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