— Who should be responsible for the accident? 

— The boss, not the workers. They just carry out the order _____. [ ]

A. as told

B. as are told

C. as telling

D. as they told

女性，25岁，心前区隐痛，胸闷反复发作数月，体检：胸骨左缘第3～4肋间粗糙的收缩期杂音Ⅲ级，无震颤，心界不大，心脏超声学显示心肌肥厚，室间隔与左室后壁厚度为1.7:1，诊为肥厚型心肌病(梗阻性)，胸痛发作时，应采用何种药物治疗

A．洋地黄
B．利多卡因
C．维拉帕米(异搏定)
D．硝酸甘油
E．双嘧达莫(潘生丁)