In order to better understand how the cuddle chemical works between dogs and humans，Nagasawa and his team did an experiment.They tested levels of the cuddle chemical in dogs and humans，and then put them in a room to interact(互动) with each other.

　　While in the room，the humans petted the dogs，spoke to the dogs，and looked into the dogs'eyes.Then the scientists tested their levels of the cuddle chemical again.They found that levels of the cuddle chemical were higher in both humans and dogs after they interacted.However，levels were the highest in the humans and dogs that simply looked into each other's eyes，without much petting or talking.

　　Simply put，the longer the humans look into the eyes of the dogs，the more the cuddle chemical is produced，Nagasawa did the same experiment with humans and wolves，but it did not give the same results.

　　【语篇解读】　研究发现，当人和狗对视的时候，双方体内的"拥抱荷尔蒙"都会增加，从而加深彼此的感情。

　　1．According to the author，the fact mentioned in Para.1 is ________．

　　A．special　　　　　 B．surprising

　　C．common D．boring

　　C　[细节理解题。根据文章第一段中的"This is not something new."可知，作者认为这种现象很普遍。]

　　2．Why did Nagasawa and his team do the first experiment?

　　A．To find how the cuddle chemical affects humans.

　　B．To help humans get along well with animals.

　　C．To make good use of the cuddle chemical.

　　D．To learn more about the cuddle chemical.

D　[推理判断题。根据文章第三段中的"In order to better understand how the cuddle chemical works between dogs and humans..."可知，科学家们做这个实验的目的是要更好地了解"拥抱荷尔蒙"是如何发挥作用的，也就是说他们想要知道有关"拥抱荷尔蒙"更多的信息。]