句式分析：本句为复合句。as引导的状语从句表示原因。

　　Passage 2

　　限时：7分钟

　　体裁：说明文　题材：科普类　难度：难词数：306

　　[2016·衡水中学周测]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). Although known as the love hormone, it affects the sexes differently.

　　“Women tend

　　to be

　　social in their behavior. They often share with others. But men tend to be competitive. They are trying to improve their social status，” said Professor Ryan.

　　Generally, people believe that the hormone oxytocin is let out in our body in various social situations and our body creates a large amount of it during positive social interactions (互动) such as falling in love or giving birth.

　　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.

　　Further researches showed that in men the hormone oxytocin improves the ability to recognize competitive relationships, but in women it raises the ability to recognize friendship.

　　Professor Ryan's recent experiment used 62 men and women aged 20 to 37.

　　Half of the

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