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."

　　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 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.

　　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.

　　D. To test people's understanding of body language.

　　50. The author develops the text by______.

　　A. explaining people's behaviors

　　B. describing his own experiences

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