Technological advances during the war, particularly in electronics, helped to make the flight simulator increasingly (15)_____. The use of efficient analog computers in the early 1950s led to further improvements. Airplane cockpits, controls, and instrument displays had by then become so individualized that it was no longer feasible to use a generalized trainer to prepare pilots to fly anything (16)_____ the simplest light planes. By the 1950s, the US Air Force was using simulators that precisely (17)_____ the cockpits of its planes. During the early 1960s (18)_____ digital and hybrid computers were adopted, and their speed and flexibility revolutionized simulation systems. Further advances in computer and (19)_____ technology, notably the development of virtual-reality simulation, have made it possible to (20)_____ highly complex real-life conditions.
1.
A. for
B. to
C. with
D. on
2.
A. concerning
B. concern
C. being concerned
D. concerned
3.
A. undertake
B. undergo
C. underplay
D. underuse
4.
A. models
B. modifications
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