introduction　
　　 san francisco is an important city on the west coast of the united states of america. it is not a very large city. only 679,000 people live in san francisco.　　　 but san francisco is the financial center of western america. it is also a center for music and art. and it is a city for toutists. three and half million people visit san francisco every year.　　　 san francisco is an international city. people from many countries live there. let us look at this inteesting city.　
　
　
　
　
　
　
　
如果有什么不足~请大家多给我提一些意见!~~谢谢了~~!!!