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

车站在检票时，应遵从的顺序是（）。

A.先一般旅客、后团体，再重点

B.先重点、后团体，再一般旅客

C.先一般旅客、后重点，再团体

D.先团体、后重点，再一般旅客