题目内容
_____ runways from 3,000 to 3,700 meters in length could be found at commercial airports.
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Commercial airports are designed to _____ the transfer of passengers and freight as efficiently and as safely as possible.
Passengers may _____ tickets at the airport ticket and baggage counter.
Passenger services are centered in the terminal building, where passengers load and _____ baggage.
Airport security involves ensuring the safety by screening passengers and their luggage for weapon or _____.
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