填空题

Airport is transportation center used for the landing and (36) of aircraft. Airports provide transportation not only for people but also for freight, such as mail, perishable foods, and other important (37) . International airports handle a (38) flow of traffic. The John F. Kennedy International airport in New York City is one of the busiest in the United States, with thousands of passenger (39) and departures every hour. An airport is composed of several areas and structures that are (40) to serve the needs of both aircraft and passengers. (41) are the long, narrow areas where airplanes take off and land. The terminal contains ticket and baggage counters. The control tower is located near the terminal. From this tower, people (42) in air traffic control coordinate aircraft movement both in the air and on the ground. For security purposes, (43) to major airports is usually limited to special roads. Many airports have large automobile parking areas to accommodate travelers. (44) . The business they create is vital to the world economy and individual national economies. In the United States, (45) . These airports also handle about 15 million metric tons of air cargo each year. Canada’s 26 airports in its National Airport System provide service to about 60 million passengers annually. The total annual economic impact of U.S. airports is estimated at over $ 500 billion. This value includes the price of airfares purchased by passengers, (46) , taxes, and indirect earnings from related businesses and industries. Airports are so important economically that many companies will not locate factories or offices in cities that do not have an adequate airport.