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."

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

A. Placebo. B. Oxytocin.

C. The gesture. D. The social status.

2. 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.

3. 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.

4. The author develops the text by______.

A. explaining people's behaviors

B. describing his own experiences

C. distinguishing sexual differences

D. discussing research experiments

【考点】考察科普知识类阅读

【文章大意】文章讲述了Professor Ryan调查实验，实验告诉我们荷尔蒙催生素能提高人们辨认不同的社会交往的能力；男女之间行为的差异是由主要是荷尔蒙的生物因素所引起的。

1. 【答案】 B

【试题解析】细节题。根据文章第一段1,2行Women are friendly. But men are more competitive. Why? Researchers have found it's all down to the hormone oxytocin(荷尔蒙催生素)可知，男女之间行为表现的不同是由于荷尔蒙催生素水平的不一