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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。 50．A 推理判断题。根据最后一段“?we may be able to develop more successful treatments for anxiety disorders, and also for those who may be suffering from serious stress disorder.”可推出选A。

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