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
专升本
Many people believe the glare from snow causes snow blindness. Yet, wearing dark glasses or not, they find themselves suffering
Many people believe the glare from snow causes snow blindness. Yet, wearing dark glasses or not, they find themselves suffering
admin
2019-05-23
81
问题
Many people believe 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 Canadian Army has now determined that 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 barren snow - covered terrain. 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, they eyes never stop searching and the eyeballs become sore and the eye muscles ache. Nature offsets this irritation by producing more fluid which covers the eyeball. The fluid covers the eyeball in increasing quantity until vision blurs, then is obscured, and the result is total, even though temporary, snow blindness.
Expriments 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 corss 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 scouring the snow - blanketed landscape. By focusing their attention on one object at a time, the men can cross the snow without becoming hopelessly snow blind or lost. In this way the problem of crossing a solid white terrain is overcome.
A proper title for this passage would be________
选项
A、Snow Blindness and How to Overcome It
B、Nature’s Cure for Snow Blindness
C、Soldiers in the Snow
D、Snow Vision
答案
A
解析
主旨大意。本文讲述雪盲,及出现的原因与克服的方法,故选A项。
转载请注明原文地址:https://kaotiyun.com/show/MOJC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
A.Ifounditmostinterestingtowatch,byslowingdownmypace,otherpeoplewalkingaheadofmeoneafteranother.B.Veryfe
Peoplehavediscoveredthatmanycoupleswhogetmarriedyoungleadunhappylivesandtheydeeplyregrethavingbeenmarriedyou
Hespentallhissparetime(in)learningEnglishinordertoadapttolifeabroadassoonaspossible.
A.Histaskistoensurethefairuseandstorageofpersonalinformationheldincomputer.B.Andthatlatertheyagreeduponc
ThevisitofthePresidentwillincreasethe_______betweenthetwocountries.
Generally,ittakescourageforanagedperson_______anewlifeinastrangecountry.
Americansarepoundoftheirvarietyandindividuality,yettheyloveandrespectfewthingsmorethanauniform,whetheritis
Shoppingforclothesisnotthesameexperienceforaman【C1】______itisforawoman.Amangoesshoppingbecauseheneedssomet
Whatisyourfavoritecolor?Doyoulikeyellow,orange,red?【T1】Ifyoudo,youmustbeanoptimist,aleader,anactiveperson
随机试题
工作满意度的心理结构成分有
为什么说社会主义民主是人类社会最高类型的民主?
word中可通过下面哪些方法设置页码()
A.贫血和出血程度一致B.贫血和出血程度不一致C.有贫血而无出血D.有出血而无贫血E.无出血亦无贫血特发性血小板减少性紫癜
下列关于竣工决算的组成内容中,说法正确的是()。
20世纪90年代以来,影响世界经济稳定发展最重要的因素是()。
若曲线y=x2+ax+b和2y=-1+xy3在点(1,-1)处相切,其中a,b是常数,则().
下列关于Delphi的叙述中,哪一项是不正确的?
设有如下3个关系表:下列操作中正确的是
In1914,anapparentlyinsignificanteventinaremotepartofEasternEurope______Europeintoagreatwar.
最新回复
(
0
)