慢性心力衰竭患者左心室扩大，EF 降低，经过心力衰竭的常规治疗，现在症状消失，患者准备停药，向你咨询，你的处理方法是（）

A.可以不吃药了

B.可以减量或换成便宜的药

C.将利尿剂调整到最小维持剂量，ACEI和β-受体阻滞剂继续大剂量长期治疗，逆转心脏重塑

D.吃半年再停药

E.B+D

If the price elasticity of demand for a good is 4.0, then a 10 percent increase in price would result in a:()

A. 4% decrease in the quantity demanded.

B. 10% decrease in the quantity demanded.

C. 40% decrease in the quantity demanded.