During his first trip to China, President Obama discussed some key global issues such as economic recovery, climate change, _______ nuclear weapons in his talks with Chinese President Hu Jintao.

A．and stopping to spread

B．to stop spreading

C．to stop to spread

D．and stopping the spread of

全食管切除术应另编码为（）。

A.食管镜检查术

B.食管活检术

C.食管部分切除术

D.食管病损切除术

E.胃造口术