B. Fear is a result of one's relaxed heartbeat. C. Fear has something to do with one's health. D. One's heart affects how he feels fear. 2．The study was carried out by analyzing   ________.

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

　　B. the time volunteers saw fearful pictures and their health conditions C. volunteers' heartbeats when they saw terrible pictures D. different pictures shown to volunteers and their heart－brain communication ．Which of the following is closest in meaning to the underlined word “mechanism” in Paragraph 6? A. Order.  

　　B. Machine. C. System. 

　　D. Treatment. ．This study may contribute to    ________． A. explaining the cycle of fear and anxiety 　 B. treating anxiety and stress better　

　　C. finding the key to the heart－brain communication 　

　　D. understanding different fears in our hearts and heads—4、DACB

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