____Shall we play in the playground?
____Can I learn to use the computer?
____Would you like to come here?
____What would you like for your birthday?
A. Sure.
B. Yes, I'd love to.
C. OK, let's go.
D. It's a secret.
大兴安岭﹣太行山﹣巫山﹣雪峰山一线是我国( )