The brown trousers _______ 70 dollars. And that white pair of trousers _______ 80 dollars.      

    Mike lives in Guangzhou. His friend Tom lives in Xi'an. This winter, Tom came to Guangzhou to see Mike. They were very happy to see each other. They asked a lot about each other's family and work. They talked about the weather in their cities, too. Guangzhou is quite warm in winter. It doesn't snow in winter in Guangzhou. Some people in Guangzhou have never seen snow. In Xi'an, it often snows in winter. Children like to play snowball fight and make snowmen. That is great fun. Mike hoped to visit Xi'an next winter.

①民族区域自治制度的基础和前提   

②民族区域自治的核心内容

③实现中华民族复兴的必要条件   

④国家统一的基础，礼会进步的保证

—Is the cola yours　　　Ann's?

—It's Ann's.