He isn’t a man who knows _____ to deal with people properly, but he does know _____ to do with all kinds of papers in front of him.

A．what, what

B．what, how

C．how, what

D．how, how

风湿性心脏病最常见的心律失常是

A．室性期前收缩

B．房性期前收缩

C．交界性期前收缩

D．心房纤颤

E．Ⅰ度房室传导阻滞