2. Listen to the following dialogue, and then choose the best answer for each question. PartA-question2.mp3 A、About 5 minutes. B、About 10 minutes. C、About 15 minutes. D、About 20 minutes. W: How long does it take to walk from this teaching building to the library? M: About 20 minutes. But if you ride a bike, it takes only about 5 minutes． Q: How long does it take to cycle from the teaching building to the library?