解析 根据文章第四段话But in a previous experiment Professor Ryan found that the hormone is also let out in our body during negative social interactions such as envy可知,在消极的如妒忌这类社会交往中,我们身体也释放出荷尔蒙。
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.
答案 A
解析 根据Professor Ryan所做的实验的过程及最后所得出的实验结论Our experiment proves that the hormone oxytocin can raise people's abilities to better distinguish different social interactions可知,最近这次实验是想测试一下荷尔蒙催生素对辨认社会能力的效果,而结果证实了荷尔蒙催生素能提高人们的这种能力。
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
答案 D
解析 本题为文章结构题。文章是通过讨论所做的不同的实验及结果而展开的,故答案为D。
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