The United States Army has now determined that the glare from snow does not cause snowblindness 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, 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 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.
The eyeballs become sore and the eye muscles ache because______.
A.tears cover the eyeballs
B.the eyes are annoyed by blinding sunlight
C.the eyes are annoyed by blinding snow
D.there is nothing to focus on
第5题
A.准确了解某一地区人群健康状况水平,能够进行国际比较
B.找出影响人群健康的主要因素
C.让政府制定出有效的政策
D.准确了解人群健康状况,找出影响人群健康的因素并采取有效的社会卫生策略
E.评价居民的生命质量
第6题
请将下列医学模式与其定义匹配:生物医学模式
A、认为疾病和健康是由超自然力量引起的医学模式
B、认为人是机器,疾病是就机器出现故障的医学模式
C、认为健康是病因、宿主和环境的平衡,三者失衡就会导致疾病的医学模式
D、按照阴阳五行学说或"四体液"学说解释疾病和健康的医学模式
E、认为疾病和健康不仅受到生物因素影响,同时受到社会与心理因素作用的医学模式
第7题
A.准确了解某一地区人群健康状况水平,能够进行国际比较
B.找出影响人群健康的主要因素
C.让政府制定出有效的政策
D.准确了解人群健康状况,找出影响人群健康的因素并采取有效的社会卫生策略
E.评价居民的生命质量
第8题
请将下列医学模式与其定义匹配:生物医学模式
A、认为疾病和健康是由超自然力量引起的医学模式
B、认为人是机器,疾病就是机器出现故障的医学模式
C、宿主和环境的平衡,三者失衡就会导致疾病的医学模式
D、按照阴阳五行学说或“四体 液”学说解释疾病和健康的医学模式
E、认为疾病和健康不仅受到生物因素影响,同时受到社会与心理因素作用的医学模式
第9题
请将下列医学模式与其定义匹配:自然哲学的医学模式
A、认为疾病和健康是由超自然力量引起的医学模式
B、认为人是机器,疾病是就机器出现故障的医学模式
C、认为健康是病因、宿主和环境的平衡,三者失衡就会导致疾病的医学模式
D、按照阴阳五行学说或“四体液”学说解释疾病和健康的医学模式
E、认为疾病和健康不仅受到生物因素影响,同时受到社会与心理因素作用的医学模式
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