听下面一段独白，回答第l至4题。 1. Which floor do they start from? A. The first floor. B. The second floor. C. The fourth floor. 2. What can they see on the second floor? A. Technology in the old days. B. Inventions in different centuries. C. Modern inventions in the 20th century. 3. Where can they have a drink? A. On the first floor. B. On the second floor. C. On the fourth floor. 4. Which is the most helpful way to find more information about the museum? A. Searching the Internet. B. Asking the guide for help. C. Buying books or magazines.