A. She went cycling in the nature park.
B. Three years ago.
C. Yes, there were.
D. No, there wasn't.
E. There was a small house many years ago.
2017年央视的鸡年春晚,广西桂林是四大分会场之一,这充分展现了各民族大团结的主旨。民族区域自治制度的前提和基础是( )