题目内容：
请根据下面的短文回答第题： Announcement( 通知 )
Good morning, ladies and gentlemen. May I draw your attention(注意) to the book Safety in Flight? You willfind the book in the pocket at the back of the seat in front of you and we ask you to read it. You' 11 also find a news-paper and you may find it interesting. For those of you not familiar with this kind of plane, you can smoke on theleft-hand side of the passenger cabin( 机舱), once the signs at the front of the cabin have been turned off, and at notime in the toilet at the back of the plane. We have a duty-free ( 免税的) bar on the plane and cigarettes, beer andmineral water will be on sale during the flight. If you have any questions during the flight, please ask our four host-esses(空姐). Would you now please fasten(系紧) your seat belts to get ready for take-off? We wish you a pleasantflight! Thank you.
The announcement is made______. A．during the flight
B．before taking off
C．after taking off
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