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 behaviour differences between men and women are caused by biological factors(因素) that are mainly hormonal.”

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

　　A. Placebo.

　　B. Oxytocin.

　　C. The gesture.

　　D. The social status.

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

　　A. Oxytocin affects our behaviour 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 behaviour differences.

　　49. 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.

　　C. To know people's different abilities to answer questions.

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