When I finished the story, Lee jumped up from his seat and started pacing the floor, ________, deep in

thought.[ ]

A. with his head bending

B. his head is bent

C. his head bending  

D. his head bent

2岁6个月男孩尚不会说话，G3P1，足月顺产，否认产伤窒息，产重3千克，生后母乳喂养至3个月，现与成人同食。9月时曾发“mama，baba”，现偶发“爸，妈，姐”，不主动说话，可以手势表示需要。可跑跳、乱画，不会用杯喝水，不与小朋友玩耍，玩具不愿他人动。由保姆带养，与父母接触少。

对诊断最有价值的实验宣检查应是

A．骨龄检查

B．甲状腺功能检测

C．听力检查

D．生长激素激发试验

E．头颅CT