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."

　　13. What can we learn from Professor Ryan's previous experiment?

　　A. Oxytocin affects our behavior in a different way.

　　B. Our body lets out oxytocin when we are deep in love.

　　C. Our body produces oxytocin when we feel unhappy about others' success.

　　D. Oxytocin improves our abilities to understand people's behavior differences.

　　14. Why did Professor Ryan conduct the recent experiment?

　　A. To test the effect of oxytocin on the ability to recognize social interactions.

　　B. To know the differences between friendship and competition.

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