-Mary has just broken up with her boyfriend.      

-_________? I don't want to fall in love with her.      [ ]

A. What if                            

B. What's wrong      

C. What about you                

D. What of it

下列哪种情况一般可以不考虑安装人工心脏起搏器（）

A.窦性停搏

B.第二度Ⅰ型房室传导阻滞

C.第二度Ⅱ型房室传导阻滞

D.第二度Ⅱ型窦房阻滞

E.第三度房室传导阻滞