“Shall Mary come and play computer games?” “No, _______ she has finished her homework.”

A．when

B．since

C．unless

D．as soon as

对稳定型心绞痛病人，下列哪些因素增加围术期急性心肌缺血的可能性（）

A.日常活动就可诱发心绞痛

B.心率较快

C.频发的室早

D.多次的心肌梗死

E.兼有高血压