摘要
When a passenger travels on an airplane of the China Northwest Aviation Company on scheduled flights from Xi’an—Beijing—Guangzhou—Beijing—Xi’an, he or she just sits in the seat, a hostess Providee a hot and wet towel to clean the face and hands. On watching TV, if he wants to listen to the sound, he can pick up the earphone in the right arm of the seat. If he wants to take
