单项选择题


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Nowadays almost every city has an airport, (9) two, in the ease of some big cities. Like a railway station, an airport is a very (10) place. At almost any hour of the day or night it is thronged (11) people, many of them are passengers who are (12) waiting for a flight out or who have just (13) . Today, a great number of people travel from one country to another by plane just as (14) as other people (15) from one town to another within the same country by train or bus.
The big building in which passengers wait for their plane is called the (16) . When a passenger arrives (17) the terminal, he goes to the airline (18) has arranged his trip. There he (19) his ticket as (20) that he has a seat in the plane. He also (21) his heavy luggage to (22) and sent to the hold of the aircraft. The passenger is allowed to carry only light articles with him. If his ticket is in order, and his luggage is not (23) , he is given a card called a (24) pass which allows his admission (25) the plane. However, he can not proceed to the aircraft (26) he (27) an announcement over the loudspeakers that his plane is about to (28) .

A.though
B.when
C.until
D.while
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