一Welcome to Bei jing！一.A. Thank you.B. You too.C. I like it very much.D. You are kind.

问题补充：

一Welcome to Bei jing！

一.

A. Thank you.

B. You ,too.

C. I like it very much.

D. You are kind.

答案：

(答案→)A. Thank you.

B. You ,too.

C. I like it very much.

D. You are kind.

解析：在英文中，对于别人的欢迎我们应该表示感谢说thank you，故本题选A。