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. Ones 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 form 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?
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 sky to the heart-brain communication
D. understanding different fears in our hearts and heads