下面诗句停顿不当的是 [ ]
A．我／用残损的手掌
B．手掌沾了／阴暗
C．那一角／只是血和泥
D．你当年／新生的禾草
答案：B
—What were you doing this time yesterday?
—I ______ on the grass and drawing a picture. [ ]
A. sit
B. sat
C. am sitting
D. was sitting
胸部损伤下述哪种情况为剖胸探查手术适应证（）
A.多根多处肋骨骨折
B.气胸肺萎陷超过30%
C.胸部爆震伤
D.进行性血胸
E.损伤性窒息发绀严重
