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
77
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
GenerationsofAmericanshavebeenbrought【C1】______tobelievethatagoodbreakfastisimportantforhealth.Eatingbreakfasta
Readthefollowingarticleinwhichfourpeopletalkabouttheirworkandlife.Forquestions61to64,matchnameofeachspeak
Readthefollowingarticleinwhichfourpeopletalkabouttheirworkandlife.Forquestions61to64,matchnameofeachspeak
WriteacompositiononthetopicTraveling—AGoodWaytoLearn.Youshouldfollowtheoutline:(1)Travelingteachespeoplea
Televisionisthemosteffectivebrainwashingmediumeverinventedbyman.Advertisersknowthistobe【C1】______.Childrenarea
Televisionisthemosteffectivebrainwashingmediumeverinventedbyman.Advertisersknowthistobe【C1】______.Childrenarea
Whereisthisconversationprobablytakingplace?
Laborforceisdefinedasbeingthetotalnumberofpeoplewhoareavailabletoworkandearnincome.Thisdefinitionincludese
Whatprobablyistherelationshipbetweenthetwospeakers?
AlbertEinsteinissaidtohavebeenaskedbyastudent,"Whatfindinghelpedyoumostwhenyouwere【C1】______thetheoryofrela
随机试题
Whatproblemdoesthespeakermention?
In1786acallwentouttoallthestatesinvitingthemtosenddelegatestoameetingtobeheldinPhiladelphiainthespring
治疗寒闭神昏的要药是
在一炼钢厂附近放牧的羊群,半年后出现骨骼变形性病变,如骨赘、局部硬肿、蹄匣变形、易骨折,以及牙面出现斑块状色素沉着、凸凹不平现象这些骨骼变形症状称为典型的()。
中性包装既不是通常说的大包装,也不是通常讲的小包装或内包装,它是中等规格的包装。()
导游服务的根本是导游人员要做到()。
村民李某从2005年9月开始,在一无组织机构和章程,二无合格的教师,三无标准的教学场所,四无必备的办学资金和稳定的经济来源的情况下,未经县教育行政部门批准,以营利为目的,在其住处办起了“太坪管区联户家庭辅导学习室”,后改名为“浦江书院”。县教育局与2007
惜墨如金对于()相当于()对于安居乐业
设对称矩阵A满足A3+A2+A=3E,则A=_______.
A、Hermildtemper.B、Herbroadknowledge.C、Herteachingstyle.D、Herdetailedanswers.A女士谈到新来的英语教师时说:“我最喜欢她的地方是,她从不生气。”即该老师脾气很
最新回复
(
0
)