听下面一段独白,回答第1至第3三个小题。 1.What do you think the speaker is? [ ] A. A teacher. B. A driver. C. A guide. 2.What's the population of London? [ ] A. 7 million. B. 17 million. C. 70 million. 3.Which of the following is not mentioned in the passage? [ ] A. The Thames River. B. Buckingham Palace. C. Big Ben.