根据场景完成对话

A:  A  famous professor from Beijing University will come to our school to give us a speech on how to get along well with parents.

B:  ①  (那太好了!)

A:But I've just heard that he can't come.

B:  ②  (发生了什么事?)

A:An accident happened on his way to our school and he was sent to hospital.

B:  ③  (真是出人意料!)

患者，男54岁，压榨性中心性胸痛发作后3小时就诊，查体：面色苍白、出汗，血压110/90mmHg，脉搏78次/min，心音正常，心电图ST段抬高，实验室检查：K⁺3.2mmol/L，Na⁺138mmol/L，尿素氮9．2mmol/L，CK90U/L。

该患者首先应确诊的疾病是（）

A.肺心病

B.肾衰竭

C.骨坏死

D.急性心肌梗死

E.营养不良