选词填空（从section, non-smoking, uncomfortable, land中选择合适的词填空）对话情景为：A passenger wants to have a cigarette on board.CA: Excuse me, Sir. Please put out your cigarette immediately.PAX: Okay. But Ireally need to have a cigarette now. Is there a smoking 1 on board?CA: Sorry, Sir. Iunderstand you'd like to smoke. However, all Air China fights are 2 and all toilets are equipped with smoke detectors.PAX: Eh…Ifeel so 3 .CA：Once you are in the terminal building you will be able to smoke in specially designated areas. And we will 4 soon.PAX: All right. Thanks.CA: Thank you for your understanding and cooperation.请选择第一个空的正确答案。