The opera house in Santa Fe, New Mexico, is one of the most beautiful in the United States. It is small and open, with one roof over the stage where singers perform and another roof over part of the audience. This opera house in the mountain is one of the best in the country, which may seem surprising because performances are only given during seven weeks in summer, and because Santa Fe is a very small city. One reason why the Santa Fe Opera is so good is that it attracts many excellent young singers .They all hope to sing in famous opera houses like Metropolitan in New York someday. And they work hard to become well-known during the summer. The musicians and directors are experts who come from the best orchestras  and operas in the country during their vacations. They enjoy working there because they like to live in Santa Fe, which is near both the mountains and the desert. It is very beautiful there in summer. The state government of New Mexico advertises the Santa Fe Opera in newspapers all over the country, and a great many tourists come to New Mexico because of the opera ,Still ,most of the audience does come from Santa Fe and other nearby cities. And all the seats in the theater are sold for every show. There is only one thing that some people do not like about the Santa  Fe Opera, and that is the cold weather .Because the theater is open, performances cannot start before it gets dark at nine o'clock in the evening, and then the mountain air becomes very cool. Sometimes people complain about the cold air ,but because the opera is good , these people come back again wearing warm coats. This passage mainly introduces  _
a mountain city young musicians an opera house the tourism in Santa Fe
Question: The opera house in Santa Fe, New Mexico, is one of the most beautiful in the United States. It is small and open, with one roof over the stage where singers perform and another roof over part of the audience. This opera house in the mountain is one of the best in the country, which may seem surprising because performances are only given during seven weeks in summer, and because Santa Fe is a very small city. One reason why the Santa Fe Opera is so good is that it attracts many excellent young singers .They all hope to sing in famous opera houses like Metropolitan in New York someday. And they work hard to become well-known during the summer. The musicians and directors are experts who come from the best orchestras  and operas in the country during their vacations. They enjoy working there because they like to live in Santa Fe, which is near both the mountains and the desert. It is very beautiful there in summer. The state government of New Mexico advertises the Santa Fe Opera in newspapers all over the country, and a great many tourists come to New Mexico because of the opera ,Still ,most of the audience does come from Santa Fe and other nearby cities. And all the seats in the theater are sold for every show. There is only one thing that some people do not like about the Santa  Fe Opera, and that is the cold weather .Because the theater is open, performances cannot start before it gets dark at nine o'clock in the evening, and then the mountain air becomes very cool. Sometimes people complain about the cold air ,but because the opera is good , these people come back again wearing warm coats. This passage mainly introduces  _
A. a mountain city
B. young musicians
C. an opera house
D. the tourism in Santa Fe
Answer: