— How ____ is it from here Ningbo to Xi'an? 　

— It's about two ____ flight. [ ]

A. long, hour's

B. far, hour's

C. long, hours'

D. far, hours'

男，28岁，突发剧烈头痛、呕吐3天．伴发热1天。体检：神志模糊，瞳孔右6mm，对光反射消失，左3mm，对光反射灵敏，四肢均有自主活动，颈有抵抗，Kernig征(＋)。体温37℃，血压 140/75mmHg。

为了明确诊断，首选辅助检查是

A．脑电图

B．腰穿脑脊液检查

C．头颅CT

D．头颅MRI

E．DSA脑血管造影