A. Order.

　　B. System.

　　C. Machine.

　　D. Treatment.

　　50．This study may contribute to

　　________．

　　A. treating anxiety and stress better

　　B. explaining the cycle of fear and anxiety

　　C. finding the key to the heart－brain communication

　　D. understanding different fears in our hearts and heads

　　【要点综述】 本文是一篇说明文。文章说明了人的恐惧与心脏和大脑的关系。

　　47．A　细节理解题。根据第四段 “The study showed that fearful faces are better noticed when the heart is pumping than when it is relaxed.Thus our hearts can also affect what we see and what we don't see—and guide whether we see fear.” 可知一个人的心脏影响一个人的恐惧程度。故选A。

　　48．C　细节理解题。根据第四段“The study tested 20 healthy volunteers on their reactions to fear as they were shown pictures of fearful faces.”以及第五段“To further understand this relationship, the scientists also used a brain scanner(扫描仪)to show how the brain influences the way the heart changes a person's feeling of fear.”可知选C。

　　49．B　词义猜测题。根据第六段“We have found an important mechanism by which the heart and brain ‘speak’ to each other to change our feelings and reduce fear”可知，我们已经发现了一个重要的机制，使心脏和大脑“对话”，以此来改变我们的感情和减少恐惧。故选B。

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