Flight simulator(飞行模拟器)refers to any electronic system for training airplanes, spacecraft pilots and crew members by simulating flight conditions. The purpose of simulation is not to completely take the place of 36 flight training but to thoroughly make the members familiar with the airplane 37 they suffer 38 danger in actual flight training. Simulation is also useful for familiarizing pilots with new adjustment to 39 planes.
Two early flight simulators appeared in
Technological advances during the war, particularly in 49 , helped to make the flight simulator realistic. The use of efficient computers in the early 1950s led to further 50 . It was no longer possible to use a trainer who couldn’t adapt to special environment to prepare pilots to fly anything but the 51 light planes. During the early 1960s electronic digital computers were 52 , and their speed and flexibility(机动性) 53 a great change in simulation systems. Further advances in computer 54 technology, especially the development of simulation, have made it possible to reproduce highly complex 55 conditions.
36.A.actual | B.difficult | C.past | D.interesting |
37.A.till | B.when | C.after | D.before |
38.A.positive | B.possible | C.necessary | D.negative |
39.A.destroy | B.exist | C.land | D.take |
40.A.supposed | B.reported | C.discovered | D.designed |
41.A.famous | B.excellent | C.effective | D.useless |
42.A.From then on | B.From now on | C.By now | D.By then |
43.A.permit | B.forbid | C.order | D.need |
44.A.for | B.so | C.but | D.or |
45.A.on the part of | B.on the basis of | C.on the track of | D.on the watch for |
46.A.flowing | B.flying | C.landing | D.diving |
47.A.to | B.for | C.on | D.in |
48.A.before | B.since | C.as | D.though |
49.A.electronics | B.machines | C.energy | D.guns |
50.A.simulation | B.improvements | C.training | D.blindness |
51.A.latest | B.longest | C.smallest | D.simplest |
52.A.deserted | B.refused | C.adopted | D.developed |
53.A.brought about | B.brought up | C.brought to | D.brought back |
54.A.film | B.television | C.telephone | D.programming |
55.A.man-made | B.real-life | C.human | D.plane |