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Many people believe the glare from snow causes snowblindnenss. Yet, dark glasses or not , they find themselves suffering from headaches and watering eyes,and even snowblindness,when exposed to several hours of "snow light" .
The United States Army has now determined that glare from snow does not cause snowblindness in troops in a snow-covered er, a man's eyes frequently find nothing to foucs on in a broad expanse of barren snow-covered terrain. So his gaze continually shifts and jumps back and forth over the entire landscape in search of tsomething to look at. Finding nothing, hour after hour, the eyes never sotp searching and the eyeballs become sore and the eye muscles ache. Nature offsets this irritation by producing more and fluid which covers the eyeball. The fluid coversthe eyeball in increasing quantity until vision blurs, then is obsured,and the result is total, even though temporary,snowblindness.
Experiments led the Army to a simple method of overcoming this problem. Scouts ahead of a main body of troops are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape,Even the scouts themselves throw lightweight , dark colored objects ahead on which they too can focus . The men following can then see r gaze is arrested. Their eyes focus on a bush and having found something to see,stop scouring the snow-blanketed lanscape. By focusing their attention on one object at a time,the men can cross the snow without becoming hopelessly snowblind or lost. In this way the problem of crossing a solid white terrain is overcome.
prevent headaches, watering eyes and blindness caused by the glare from snow, dark glasses are_____.
spensible
ul
fective
lable
the eyes are sore tears are produced to ________.
r the vision
dy snowblindness
the irritation
en the muscles
blindness may be avoided by_______.
entrating to the solid white terrain
ching for something to look at in snow-covered terrain
iding the eyes with something to foucs on
ring the eyeballs with fluid
scouts shake snow from evergreen bushes in order to _______.
the men behind something to see
tify the landscape
themselves in the cold
ent the men behind from losing their way
5.A suitable title for this passage would be _______.
blindness and how to overcome it
ue's cure for snowblindness
iers in the snow
vision
答案：
CCCAA
