严重高钾血症伴心律失常，应首先（）。

A.口服阳离子交换树脂

B.静脉给予氯化钙

C.紧急血液透析

D.静脉给予葡萄糖+胰岛素

E.静脉输注碳酸氢钠

—This physics problem is too difficult. Can you show me          , Li Lei?        

—Sure.          [ ]

A. what to work it out

B. what to work out it          

C. how to work it out

D. how to work out it