【填空题】可以达到视觉统一的方法有哪些？说出其中3个即可

【填空题】Lesson 3 Listening Comprehension Blank-filling 2 We will begin by explaining the layout of a typical airport. Although airports are different in size and layout，airport markings and procedures have been 1 for safety and efficiency of operations so that everyone can comfortably and safely 2 on the ground. When an airport is built the runways are laid out so that the approaches to the runways avoid higher 3 and 4 , and the primary runway is aligned as much as possible with the commonly 5 . Any 6 runways are for use when the winds are from other directions. Generally pilots try to utilize the runway with the most direct 7 which minimizes the runway distance required also reduces their workload. The 8 width, strength and number of runways will be determined by the amount and the size of traffic expected. Many airports started out small and were 9 as use increased. Airport Landing services can be asphalt, 10 , grass, gravel or for sea planes water. Airports will also have taxiways and parking areas known as 11 . As airports increase in size and usage they become hosts to aviation businesses that provide fueling service, 12 , flight training, passenger and 13 service, manufacturing and other related services. When operating from a towered airport air traffic control or ATC will 14 arrivals and departures by issuing instructions and 15 to the pilots. When operating from a non-towered airport the pilots coordinate their own movements and use recommended patterns and procedures for safety and efficiency.

【填空题】Lesson 3 Listening Comprehension Blank-filling Passage One On January fifteenth, US Airways flight fifteen forty-nine was leaving La Guardia airport near New York City. Everything seemed normal and the weather was good that day. But as the 1 climbed to about 2 in the air, something happened. Captain Chesley Sullenberger reported that both of his plane's engines had 3 . The engines soon 4 . The plane was unable to 5 to the airport. So Captain Sullenberger made a quick decision to land the plane on the 6 of the nearby Hudson River. The emergency landing was 7 perfectly. Captain Sullenberger's actions saved the lives of one hundred fifty-five passengers and crew. But the 8 brought attention to a real and growing threat to 9 . Bird strikes happen all over the world. And they are not 10 . Bird Strike Committee USA says bird strikes cause about 600 million dollars in damage to American 11 and 12 aviation each year. The group says fifty-six thousand incidents were reported to the F.A.A. between 1999 and 2004. More than 7,600 bird and other 13 were reported for civilian aircraft in two thousand seven. But studies show only about 14 of bird strikes to civilian aircraft are reported. These incidents can be 15 . The organization says wildlife strikes have led to the deaths of 219 people around the world since 1988.