When asked why he went there, he said he was sent there ________ for a space flight.

A．training

B．being trained

C．to have trained

D．to be trained

颈总动脉的体表投影（）

A.自胸锁关节，沿胸锁乳突肌前缘向上至乳突尖连线

B.自胸锁关节，沿胸锁乳突肌前缘向上至下颌角

C.自胸锁关节，沿胸锁乳突肌前缘向上至耳垂

D.自胸锁关节，沿胸锁乳突肌前缘向上至甲状软骨上缘以下

E.自胸锁关节，沿胸锁乳突肌前缘向上至舌骨平面