80、乘机旅客的差异分类主要包括地区差异、气质差异、年龄差异、性别差异、( )、散客与团体旅客的差异以及初次乘机旅客与经常乘机旅客的差异。

14、——( )
——OK. Here you are.

13、——Which flight are you going to( )?
——Flight MU875.

12、Please go through that gate ,the staff may give you a( ).

11、A: When will Flight MU523 be ready for check-in?

31、被辐照物质接受一次辐照所吸收的X射线能量是( )的定义。

21、Please separate these bags and put them on the( ),which will take them to be screened by X-ray equipment.

20、——How long will the search take?
——It depends. If you don’t have any( ), it will be very quick.

19、Airport fee is airport( )fee.

18、A flight from one country to another country is called a ( ).

17、Just put your carry-on baggage on the belt, which will take it to be screened by( ).