男，61岁，冠心病心绞痛伴左心衰竭入院，应用洋地黄后出现频发多源性室性早搏。

根据上述病情最重要的检查应选择（）

A.查血清钾浓度

B.作全导心电图

C.作超声心动图

D.查血糖及尿酮体

E.查心肌酶谱

Speaker A: I’m awfully sorry. I hope I haven’t spoiled it.
Speaker B: ().

A. Oh, it’s nothing. Don’t let a little thing like that worry you.

B. I know you are unintentional. Just be more careful next time.

C. There is no need for you to say sorry. Anyway, I can buy a new one.

D. You are right. You haven’t spoiled it. You see, it’s still in good condition.