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  3. Many people believe the glare from snow causes snow blindness. Yet, dark glasses or not, they find themselves suffering from hea

Many people believe the glare from snow causes snow blindness. Yet, dark glasses or not, they find themselves suffering from hea

admin2015-01-15  14
问题     Many people believe the glare from snow causes snow blindness. Yet, dark glasses or not, they find themselves suffering from headaches and watering eyes, and even snow blindness, when exposed to several hours of "snow light" .
    The United States Army has now determined that the glare from snow does not cause snow blindness in troops in a snow-covered country. Rather, a man’s eyes frequently find nothing to focus on in a broad expanse of a snow-covered area. So his gaze continually shifts and jumps back and forth over the entire landscape in search of something to look at. Finding nothing, hour after hour, the eyes never stop searching and the eyeballs become sore and the eye muscle aches. Nature balances this annoyance by producing more and more liquid which covers the eyeballs. The liquid covers the eyeballs in increasing quantity until vision blurs. And the result is total, even though temporary, snow blindness.
    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 something. Their gaze is arrested. Their eyes focus on a bush and having found something to see, stop searching through the snow-blanketed landscape. By focusing their attention on one object at a time, the man can cross the snow without becoming hopelessly snowblind or lost. In this Way the problem of crossing a solid white area is overcome.
Which statement can be inferred from this article?
选项 A、The snow blindness means inability to see anything because of the snow.
B、Sloving the problem of snow blindness is important in army.
C、American army accentuates the problem of snow blindness very much.
D、Snow blindness can be cured easily.
答案B
解析 根据第二段内容可知，A项不正确；文中只是以美国部队为例，但并未提到美国军队是否非常重视雪盲症这一问题，故C项不正确；D项中需要注意的是，雪盲症不是一种疾病。从文章最后一段可以推知，雪盲症给部队带来很大不便，所以应该解决这一问题。所以，答案是选项B。
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