—Tony said he could fix my bicycle, but I really doubt it.

—_______. He’s very good at this sort of thing.[ ]

A. Don’t worry

B. I couldn’t agree more

C. Of course

D. A piece of cake

我国少数民族主要集中分布在（   ）

A．西南、西北和东北

B．华南、西南和西北

C．华中、青藏地区和西北

D．东北、华北和西南