participants (参与者) received oxytocin. The other half received placebo (安慰剂)．

　　After a week, the two groups switched with participants. They went through the same procedure with the other material.

　　Following each treatment, they were shown some

　　video pictures with different social interactions.Then they were asked to analyze the relationships by answering some questions.The questions were about telling friendship from competition. And their answers should be based on gestures，body language and facial expressions.

　　The results indicated that, after treatment with oxytocin, men's ability to correctly recognize competitive relationships improved, but in women it was the ability to correctly recognize friendship that got better.

　　Professor Ryan thus concluded：“Our experiment proves that the hormone oxytocin can raise people's abilities to better distinguish different social interactions.And the behavior differences between men and women are caused by biological factors (因素) that are mainly hormonal.”

　　文章通过Ryan教授的实验得知：荷尔蒙催生素可以使人们更好地辨别不同社交互动的能力，男女行为的不同主要是由荷尔蒙生理因素引起的。

　　1．What causes men and women to behave differently according to the text?

　　A．Placebo.

　　B．Oxytocin.

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