A client with bicuspid aortic valve has severe stenosis and is scheduled for valve replacement. While teaching the client about his condition and upcoming surgery, the nurse shows him a heart illustration. Which valve will be replaced ？（）

A．A

B．B

C．C

D．D

储蓄存款、股票、债券和保险等为投资者提供了多样的投资品种和选择空间。以下投贷方式，可以更好地规避风险又尽可能使自己的资金保值增值的是 [ ]

①对各类产品在收益和风险之间理性权衡后再投资

②为获取高收益将主要资金投人流通性强的股票市场

③将资金按合理的比例分散投资在不同的产品上

④在物价涨幅等于或高于存款利率情况下将资金存入银行

A．①③

B．②③

C．①②

D．③④