54. According to the passage, which of the following is NOT a possible cause of many heart attacks?
(A) Decreased blood flow to the heart.
(B) Increased blood pressure.
(C) Lower heart rate.
(D) Increase in hormones.
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統計: A(0), B(0), C(1), D(0), E(0) #3878191
統計: A(0), B(0), C(1), D(0), E(0) #3878191