--- Sorry, I'm afraid I can't go camping with you. I have to make a good preparation for the entrance college examinations.

　--- __________! We can camp together next time.

A．Don't say so

B．Congratulations

C．Good luck

D．Don't mention it.

青藏高原上的藏族同胞穿的“不对称”的藏袍，是为了适应

A．青藏高原上稀薄的空气，防止缺氧

B．青藏高原气温日较差大

C．藏族人民宗教信仰的要求

D．青藏高原上饮食习惯