题目内容：
阅读短文，回答题：Announcement(通知)
Goodmorning．ladiesand gentlemen．May I draw your attention(注意)to the book Safety in Flight?You willfind the book in the pocket atthe back of the seat in front of you and we ask you to read it．You’ll also find a news—paper and you may find it interesting．For those of you not familiar with this kind of plane，you call smoke on the left．hand side of the passenger cabin(机舱)，once the signs at the front of the cabin have been turned off，andat notime in the toilet at the back of the plane．Wehave a duty—free(免税的)bar on the plane and cigarettes，beer and mineral water will be on sale during the flight．If you have any questions during the flight，pleaseask our four host—esses(空姐)．Wouldyou now please fasten(系紧)your seat belts to get readyfor take-off?We wish you a pleasant flight!Thank you．
The announcement is made__________． A．during the flight
B．before taking off
C．after taking off
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