—______ two little boys behind the trees?

—No, ______. [ ]

A. Is there; there is

B. There isn't; there are

C. Are there; there aren't

D. There aren't; there aren't

男，30岁。车祸外伤1小时，左颞部着力，当时有短暂昏迷，对受伤情况不能回忆。查体：神志清，神经系统无阳性体征。

若伤后5小时出现渐进性意识障碍，应首选的检查是（）

A.脑血管造影

B.腰穿

C.头颅X线摄片

D.头颅CT

E.放射性核素扫描