听下面一段材料,回答第1-4题。 1. Where does the conversation probably take place? A. In a railway station. B. On a plane. C. In an airport. 2. What is considered dangerous in the man's bag? A. A bottle of water. B. A bomb. C. A machine. 3. How long does the security check usually take? A. Half an hour. B. An hour. C. One and a half hours. 4. Which area should the man go to? A. Area 1. B. Area 2. C. Area 22.