Why talk to a stranger is good to our health according to this article？ ( )

参考解析：

细节题。根据题干信息定位第二段，new evidence has shown that plucking up the courage to strike up a conversation might be good for our health这里只是讲到有助于我们的健康，原因在第四段people are in a better mood after they reach out and have a conversation, however minimal可知人们在主动和别人交谈之后心情会好一些，不管交谈的内容有多少，所以B项正确；A项：我们周围充斥着陌生人，这只是一个现象，并不是原因，排除；C项：定位第四段，every participant in our experiment who actually tried to talk to a stranger found the person sitting next to them was happy to chat.文段只是说人们试着和别人开心的交谈，并不是原因；D项：定位第一段开头，也不是原因。故本题正确答案选B。