Beijing is _______ capital of China. And it's one of _______ in Asia.

A．a; the most beautiful city

B．the; the most beautiful city

C．a: the most beautiful cities

D．the; the most beautiful cities

男性，57岁，糖尿病患者，应用胰岛素治疗，下午3点突起心慌、多汗、软弱、而后神志不清，体检脉搏120/分、化验尿糖(—)，尿酮 (—)，尿素氮轻度升高，最可能为

A．高渗性昏迷
B．酮症酸中毒昏迷
C．低血糖昏迷
D．脑血管意外
E．尿毒症昏迷