听力原文：M: So you' re visiting San Francisco? W: Yes, I just got here yesterday. And you? M: I' m a native. W: Oh, really? Everyone else I' ve met so far has been a tourist like us. I was beginning to think that there were no natives. M: Well. San Francisco has a lot of different ethnic groups so you might think you' re seeing a lot of foreigners. But actually, the city has a population of about 700 000. W: What are the different ethnic groups? M: Well, after whites, the largest one is blacks. W: I thought it was Chinese. M: It's true that San Francisco has the largest Chinese community outside of Asia. But there are many more blacks here than Chinese. W: That' s interesting. Don' t most of the Chinese people live in China-town? M: Well, no, they live all over the city, but China-town is definitely the center of Chinese culture here. That' s where you' ll find the best Chinese restaurants, bookstores, art, theaters, things like that. W: What about the Japanese? Doesn' t San Francisco have a large Japanese population too? M: No, actually there are only about 12 000 Japanese people here, but we do have an area called 'Japan-town' that has Japanese restaurants and bookstores. W: You seem to know a lot about this city. M: Well, most San Franciscans think their city is pretty special. We like to tall about it. Besides, I teach ethnic history at the university here. W: No wonder you know so much! What is the largest ethnic group in San Francisco?