21. 阅读短文,回答问题。China is a big country. There is a population of 1.3 billion(13亿人口)in China. People speak Chinese in China. Beijing is the capital ofChina. It's an old and famous city. It's in the north .In China, there are manybig cities. Shanghai is a famous city, too. It's in the east of China. I livein shanghai. My favourite city is Sanya. Sanya is in the south. Lhasa(拉萨)is in the west.