提示：如果该病例为下后壁急性心肌梗死提问：最常出现的心律失常应是

A．心房扑动

B．室性期前收缩

C．心房纤颤

D．房室传导阻滞

E．心室内传导阻滞

— _____________ is the book?

— Ten yuan.[ ]

A. How many

B. How much

C. How old