The modern plane is not the machine _____ it was when first invented.

A．than

B．as

C．that

D．what

患者，男，64岁。高血压病史5年，晨起突然口齿不清，口角斜，左侧肢体活动障碍。应首选的检查项目是

A．腰穿脑脊液
B．脑血管造影
C．脑电图
D．头部CT
E．脑超声波