答案：A

　　3．解析：考查推断。由第五段Professor Ryan最近实验的目的和最后一段Professor Ryan最近实验结果可知：想测试一下荷尔蒙催生素对辨认社交能力的效果。

　　答案：A

　　4．解析：考查文章结构。本文展示实验过程，讨论实验结果。

　　答案：D

　　C

　　In a study, Scientist Kathleen Vohs started thinking about her own routine of putting sugar in her coffee, testing how little routines influence our experiences.

　　The first experiment involved two groups and each participant was given a piece of chocolate. The first group was asked to relax and then eat the bar at any time. The second was given a set of detailed instructions to follow before eating. The group that went through the specific chocolate eating routine actually enjoyed eating the candy more than the other group.

　　The key, according to researchers,

　　is in the deliberate participation of the task. Random

　　(随机的) movements didn't add to the joy. People who participated in a simple routine before eating, particularly after a delay between the routine and consumption, enjoyed the food more.

　　What researchers found is that when we participate in short and deliberate behaviors, we tend to enjoy our experiences more. The data was so clear after four different experiments that researchers may now begin looking at how routines could help us recover faster after an operation, reduce our pains, and enlarge our life experience in other ways.

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