A: This toothache is killing me.
B: If I am right, this is the third time you’ve had it this month.A: You are right. ().

A. It’s all right.

B. It’ll be gone.

C. I have no method.

D. I’m fed up with it.

高血钾可使洋地黄所致的心律失常加重的是（）

A.快速室率心房颤动

B.室性期前收缩

C.房性心动过速

D.三度房室传导阻滞

E.室性心动过速