Since Tom ______ downloaded a virus into his computer, he

can not open the file now.

A．readily

B．horribly

C．accidentally

D．irregularly

小脑幕裂孔疝（）

A.头痛，呕吐，视 * * 水肿

B.呼吸骤停

C.昏迷，患侧瞳孔散大，对侧肢体偏瘫

D.血压升高，脉搏变慢，出现潮式呼吸

E.烦躁，高热，去脑强直发作