听下面一段材料,回答第1-4题。 1. What is the main topic of the man's speech? [ ] A. Social development. B. Environment protection. C. Scientific research. 2. Who is the man? [ ] A. A government official. B. A tourist guide. D. A professor. 3. When did the man go to Anchorage for the first time? [ ] A. In 1960. B. In 1980. D. In 2000. 4. What is the man most probably doing next? [ ] A. Writing a letter to the government. B. Showing some slides. C. Planning a suggestion.