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.

　　“We have found an important mechanism by which the heart and brain ‘speak’ to each other to change our feelings and reduce fear，” Dr Garfinkel said.

　　“We hope that by increasing our understanding about how fear is dealt with and ways that it could be reduced, we may be able to develop more successful treatments for anxiety disorders，and also for those who may be suffering from serious stress disorder.”

　　47．What is the finding of the study?

　　A. One's heart affects how he feels fear.

　　B. Fear is a result of one's relaxed heartbeat.

　　C. Fear has something to do with one's health.

　　D. One's fast heartbeats are likely to cause fear.

　　48．The study was carried out by analyzing

　　________.

　　A. volunteers' heartbeats when they saw terrible pictures

　　B. the time volunteers saw fearful pictures and their health conditions

　　C. volunteers' reactions to horrible pictures and data from their brain scans

　　D. different pictures shown to volunteers and their heart－brain communication

　　49．Which of the following is closest in meaning to “mechanism” in Paragraph 6?

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