Li Lei realized       necessary for him to get up early to do some exercise for he found he was getting fatter and fatter..

A．one

B．that

C．it

D．this

临床心电生理检查适应于（）

A.房室与室内传导阻滞

B.评价抗心律失常药物疗效

C.窦房结功能测定

D.不明原因的晕厥

E.确定心动过速起源部位同时行导管消融治疗