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
公务员
Many people believe the glare from snow causes snow blindnenss. Yet, dark glasses or not, they find themselves suffering from he
Many people believe the glare from snow causes snow blindnenss. Yet, dark glasses or not, they find themselves suffering from he
admin
2011-01-01
43
问题
Many people believe the glare from snow causes snow blindnenss. Yet, dark glasses or not, they find themselves suffering from headaches and watering eyes, and even snowblindness, when ex- posed to several hours of "snow light".
The United States 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, the eyes never stop searching and the eyeballs become sore and the eye muscles ache. Nature offsets this irritation by producing more and fluid which covers the eyeball. The fluid covers the eyeball in increasing quantity until vision blurs, then is observed, 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 scouring the snow-blanketed lanscape. By focusing their attention on one object at a time, the men can cross the snow without becoming hopelessly snowblind or lost. In this way the problem of crossing a solid white terrain is overcome.
A suitable tide 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
本文通篇都讲雪盲以及如何避免雪盲,正确答案应该是A。
转载请注明原文地址:https://kaotiyun.com/show/2KBq777K
本试题收录于:
中学英语题库教师公开招聘分类
0
中学英语
教师公开招聘
相关试题推荐
()是个人想象他人对自己的认识,如想象他人心目中自己的形象,想象他人对自己的评价,以及由此而产生的自我感。
Duringthesummerholiday,IthinkIshoulddosomething【M1】______meaningfulinsteadtouring.SoIgotajo
Duringthesummerholiday,IthinkIshoulddosomething【M1】______meaningfulinsteadtouring.SoIgotajo
Sincethebeginningofhumanevolution,menhavemigrated(迁移)acrosscontinentsinsearchoffood,shelter,safety,andcomforta
Therearemanykindsoffriends.Somearealways【C1】______you,butdon’tunderstandyou.Somesay"onlyafewwordstoyou,but
Duringthesummerholiday,IthinkIshoulddosomething61.______meaningfulinsteadtouring.SoIgotajob
Oneafternoon,mysonAdamaskedme,"Areallpeoplethesameeveniftheyaredifferentincolor?"Ithoughtforaminute,
TheotherdaymybrotherTomwasbeginninghis56.______motorbikethenourneighbor,Marycameou
IwillneverforgettheyearIwasabouttwelveyearsold.Mymothertoldusthatwewouldnotbe【16】Christmasgiftsbecausethe
IwillneverforgettheyearIwasabouttwelveyearsold.Mymothertoldusthatwewouldnotbe【16】Christmasgiftsbecausethe
随机试题
∫sin2xdx=()
幂级数的收敛半径为【】
Lawntennisisagoodsport,beingbasedontheancientgameofcourttennis,whichprobablycameupinEgyptorPersiasome250
根据《民法通则》的规定,下列关于法律行为有效要件的表述中,不正确的是()。
家庭社会工作的基本原则主要有()。
在社会策划模式中,社会工作者主要扮演()角色。
以下作品属于“画圣”吴道子的是()。
下面有关全国人大常委会的说法错误的是()
Iamsorryto______(give)yousomuchtrouble.
A、Sheisunwillingtoundertakethem.B、Shecomplainsaboutherbadluck.C、Shealwaysacceptsthemcheerfully.D、Shetakesthem
最新回复
(
0
)