31、职业道德调整的是( )的社会关系。

44、A:( )

43、Which of the following is not the two letter code of American Airlines?

45、The security check is carried out for( ).

44、A:Can you( ) ?

43、A: I’ve heard an announcement that my flight has been delayed. Could you tell me why?

45、A: Where are you going?

44、A: Are you going to take a domestic or an international flight?

43、( )is the carriage of goods from place to place by air.

42、The staff should give the( ) a manual search.

46、A:( )