Which of the following findings is suggestive of myocardial infarction (MI)

A. Below-normal erythrocyte sedimentation rate.
B. Elevated white blood cell count.
C. Elevated serum cholesterol value.
D. Elevated creatine phosphokinase (CPK) valu

—_________do you write to your parents?

—Once a month.

A．How much

B．How often

C．How long

D．How