首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Some surveys show that a lot of people believe that the glare from snow causes snow-blindness. Yet, wearing dark glasses or not,
Some surveys show that a lot of people believe that the glare from snow causes snow-blindness. Yet, wearing dark glasses or not,
admin
2011-03-01
72
问题
Some surveys show that a lot of people believe that the glare from snow causes snow-blindness. Yet, wearing 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 glare from snow actually does not cause snow-blindness in troops in snow-covered country. Rather, a man’s eyes frequently find nothing to focus on in a broad expanse of a wide snow-covered territory. His gaze, in consequence, continually shifts and jumps back and forth over the entire landscape in search of something he can look at. Finding nothing to focus on, hour after hour, the eyes never stop searching, and the eyeballs will become sore and eye muscles will ache. Nature reduces this uncomfortable feeling by producing more and more fluid which covers the eyeball. The fluid covers the eyeball in increasing quantity until vision becomes increasingly unclear. The result may be total, even though temporary, snow-blindness.
Experiments led the Army to a simple method of overcoming this problem. A small group of soldiers will be sent ahead of a main body of troops. They are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape. Even these soldiers themselves throw lightweight, dark colored objects ahead, on which they, too, can focus. The men following them can then see something. Their gaze is arrested. Their eyes focus on a bush and, having found something to see, stop searching the snow-blanketed landscape. By focusing their attention on lone object at a time, the troops can cross the snow-covered wilderness without becoming hopelessly snow-blind or lost. In this way the problem of crossing a solid white territory is overcome.
The pioneers ahead of the main body of troops throw some lightweight, dark colored objests to ______.
选项
A、cross completely snow-covered landscape
B、prevent themselves from suffering snow-blindness
C、let the men behind them see something
D、warm themselves in the cold
答案
B
解析
细节题。第三段第三句话指出,走在大部队前面的先遣小分队在前进过程中也不断地向前面方向投掷深颜色、轻质地的物体,为他们自己的眼睛提供可看的东西,以克服雪盲现象。因此,正确应为B项。
转载请注明原文地址:https://kaotiyun.com/show/v5kd777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
Wheredoestheconversationtakeplace?
Onwhatdayoftheweekwillthemagazinearrive?
Onwhatdayoftheweekwillthemagazinearrive?
Whatprobablyistherelationshipbetweenthetwospeakers?
Whatcanwelearnfromtheconversation?
AlbertEinsteinissaidtohavebeenaskedbyastudent,"Whatfindinghelpedyoumostwhenyouwere【C1】______thetheoryofrela
AlbertEinsteinissaidtohavebeenaskedbyastudent,"Whatfindinghelpedyoumostwhenyouwere【C1】______thetheoryofrela
MeriwetherLewiswasbornnearCharlottesville,VirginiaonAugust19,1775.Forseveralyearshewasthepersonalsecretaryo
MeriwetherLewiswasbornnearCharlottesville,VirginiaonAugust19,1775.Forseveralyearshewasthepersonalsecretaryo
随机试题
简述价值规律在私有制商品经济中的作用。
Becarefulofthosewhousethetruthtodeceivepeople.Whensomeonetellsyousomethingthatistrue,butleavesoutimportant
患者,男性,78岁。面色苍白、食欲不振半年余。查体:皮肤黏膜苍白,舌乳头萎缩,呈“牛肉样舌”。血红蛋白80g/L,白细胞3.2×109/L,血小板66×109/L,网织红细胞3.4%,平均红细胞体积(MCV)124fl,白细胞分类正常。患者出现“牛肉样
胃术后近端空肠段逆流胃术后低血糖综合征
凡能随时出售而换回现金的金融工具,一般称之为流动性强。()
裙式支座的结构特点是支座较低,由钢板制成,其优点是( )。
发生铁路建设工程质量事故,应当依据国家相关规定调查处理。下列事故调查处理应当执行《铁路交通事故应急救援和调查处理条例》的是()。
成人择期手术患者术前应禁食的时间为()。
下列各项符合20世纪初梁启超史学主张的是()①反对把史书写成帝王谱牒②提倡用章节体编写史书③批判近代西方史学理论④强调探讨社会进化之理
一棵二叉树的前序遍历结果是ABCEDF,中序遍历结果是CBAEDF,则其后序遍历的结果是()。
最新回复
(
0
)