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Flight simulator (飞行模拟器) refers to any electronic or mechanical system for training airplane and spacecraft pilots and crew member by simulating fight conditions. The purpose of simulation is not to completely substitute (1) actual fight training but to thoroughly familiarize students with the vehicle (2) before they (3) extensive and possibly dangerous actual flight training. Simulations also is useful for review and for familiarizing pilots with new (4) to existing craft.
Two early flight simulators appeared in England within a decade after the first fight of Orville and Wilbur Wright. They were designed to enable pilots to stimulate simple aircraft (5) in three dimensions: nose up or down; left wing high and right low, or vice versa; and (6) to left or right. It took until 1929, however, for a truly effective simulator, the Link Trainer, to appear, devised by Edwin A. Link, a self-educated aviator and inventor from Binghamton, New York. (7), airplane instrumentation had been developed sufficiently to permit “blind” flying on instruments alone, but training pilots to do so involved (8) risk. Link built a model of an airplane cockpit equipped (9) instrument panel and controls that could realistically stimulate all the movements of an airplane. Pilots could use the device for instrument training, manipulating the controls (10) instrument readings so as to maintain straight and level flight or (11) climb or descent with no visual reference (12) any horizon except for the artificial one on the instrument panel. The trainer was modified (13) aircraft technology advanced. Commercial airlines began to use the Link Trainer for pilot training, and the US government began purchasing them in 1934, (14) thousands more as World War II (15).

问题1选项
A.for
B.to
C.with
D.on
问题2选项
A.concerning
B.concern
C.being concerned
D.concerned
问题3选项
A.undertake
B.undergo
C.underplay
D.underuse
问题4选项
A.models
B.modifications
C.modifiers
D.modicum
问题5选项
A.manifestations
B.manipulations
C.manifestoes
D.maneuvers
问题6选项
A.yawling
B.yawning
C.yawing
D.yawping
问题7选项
A.From then on
B.From now on
C.By now
D.By then
问题8选项
A.considerable
B.considerate
C.considering
D.considered
问题9选项
A.for
B.in
C.with
D.on
问题10选项
A.On the part of
B.On the basis of
C.On the track of
D.On the verge of
问题11选项
A.control
B.controllable
C.controlled
D.controller
问题12选项
A.to
B.for
C.on
D.in
问题13选项
A.as for
B.as to
C.as
D.for
问题14选项
A.acquiring
B.requiring
C.sustaining
D.retaining
问题15选项
A.realized
B.realizing
C.approaching
D.approached
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