_____ twelve, Mike started his first novel.  [ ]

A. In the age of    

B. At his age of

C. At her age of    

D. In his age of

四岁男童，吃花生米时突发气促，吸气困难，诊断为气管异物，查体可见（）

A.呼气时，胸骨上窝、锁骨上窝、肋间隙向内凹陷

B.吸气时，胸骨上窝、锁骨上窝、腹部向内凹陷

C.吸气时，胸骨上窝、肋间隙、腹部向内凹陷

D.呼气时，胸骨上窝、锁骨上窝，腹部向内凹陷

E.吸气时，胸骨上窝、锁骨上窝、肋间隙向内凹陷