To read Tolstoy and ____ to the nineteenth century Russian literature are two excellent reasons for taking Professor Morrel’s course.

A．to introduce

B．introduce

C．being introduced

D．to be introduced

患者，男性，73岁。风湿性心脏病.心力衰竭，服用地高辛及氢氯噻嗪等药物治疗。心电图示：室性期前收缩二联律，心率120次／分，血钾2.78mmol／L，地高辛浓度未测，下列哪项处理最合适（）

A.吸氧

B.普萘洛尔

C.雷米普利

D.氯化钾

E.利多卡因