五千年的悠悠岁月,在古老文明的身躯上留下了璀璨的光芒。[ ]
√
David ________ from the analysis of the traffic accident that it had been caused by human error.[ ]
A.announced
B.acknowledged
C.concluded
D.considered
下述哪项是蛛网膜下腔出血的病因()
A.动静脉畸形
B.长段动脉膨胀(dolichoectatiC.
C.颅内肿瘤
D.Moyamoya病
E.真菌性动脉瘤