He’s got himself into a dangerous situation _________ he is likely to lose control over the plane.

A．where

B．which

C．while

D．why

脓性指头炎出现搏动性跳痛时首先应采取的治疗措施是（）。

A.切开引流

B.理疗

C.应用抗生素

D.热盐水浸泡

E.外敷鱼石脂软膏