（1）On which floor will they start their visit？ （On the first floor/On the second floor/On the third floor）
（2）What can they see on the second floor？ （Technology in the old days / Inventions in different centuries /Modern inventions in the 20th century）
（3）What is the best way for them to get more information？ （Searching the Internet /Asking the guide for help /Buying books or magazines）
（4）What is this speaker's job？ （A guide/A teacher/A worker）