41岁女性，Graves病病史10年，因抗甲状腺药物治疗不规则。病情长期未获满意控制。近半个月来出现心慌、气短、多汗而入院检查。诊断为甲状腺功能亢进性心脏病（房颤）。其心脏病治疗的关键措施是（）

A.电转复

B.大剂量心得安

C.卧床休息，镇静剂

D.毛花苷丙治疗

E.正规的抗甲状腺药物治疗控制甲状腺功能亢进

A boy walking along a road at 3 kilometers per hour is overtaken by 3 truck traveling at 40 kilometers per hour. If the truck breaks down 1 kilometer beyond where it passes the boy, how many minutes after the breakdown does the boy reach the truck ？（）

A.A

B.B

C.C

D.D

E.E