落枕后扳法的操作是（）

A.先作颈部后伸位拔伸手法

B.再在颈部后伸位迅速旋转

C.先作颈项部轻缓的旋转

D.操作时快速而平稳地加大旋转幅度

E.操作时旋转幅度要大，可超出患者忍受的限度

Since Tom _____ downloaded a virus into his computer, he can not open the file now. [ ]

A. readily

B. horribly

C. accidentally

D. irregularly