听下面一段材料,回答第1-3题。 1. What is the lecture mainly about? A. New energy. B. Serious energy problems. C. How to save oil. 2. How will the girl go to school today? A. By bike. B. By car. C. On foot. 3. Which do they think is the most effective way? A. To develop more new energy. B. To save resources. C. To close chemical plants.