单项选择题
A.氧气瓶 B.化学氧气发生器
A.卫生间 B.机上锂电池 C.客舱
A.弯腰/趴下Bend over/Keep your heads Down B.坐在座位上，保持镇静Keep seated，keep calm. C.到这边来/Come thisway D.快点走/Move faster