阅读理解。 Good evening, ladies and gentlemen: May I draw your attention to the 'Safety in Flight' booklet, which you'll find in the pocket on the back of the seat in front of you? We do ask you to read it. You'll also find a magazine, which you may find interesting. Smoking is not allowed during the flight. If you have any questions during the flight, please do not hesitate (犹豫) to ask the two flight attendants. Would you now please ensure that your seat belts are safely fastened in preparation for take-off? We wish you a pleasant flight. Thank you. 根据短文内容，选择正确答案。 1. When is the announcement made on the plane? A. During the flight. B. Just before landing. C. Shortly before taking off. D. Shortly after taking off. 2. Is smoking allowed during the flight? A. Yes, but only during day flight. B. Yes, but only in the toilet. C. Yes, but only in a certain area of the plane. D. No, it is not allowed. 3. What are passengers advised to do after they sit on the seat? A. To read the signs. B. To ask questions. C. To read the 'Safety in Flight' booklet. D. To find out where they can smoke. 4. The word 'fasten' means ______. A. 穿上 B. 松开 C. 系紧 D. 加快 5. What can we know from the passage? A. The plane is going to fly over land. B. The plane is going to across the ocean. C. Meals will be served during the flight. D. The passengers will have a night flight.