单项选择题

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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单项选择题

The phrase susceptible to in ParA．2 could best be replaced by （）

A. aware of
B. affected by
C. accustomed
D. prone to

单项选择题

What does the passage mainly discuss（）

A．Risk factors in heart attacks.
B．Seasonal and temporal patterns of heart attacks.
C．Cardiology in the 1980s.
D．Diet and stress as factors in heart attacks.