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
Many people believe the glare from snow causes snow blindness. Yet, dark glasses or not they find themselves suffering from head
Many people believe the glare from snow causes snow blindness. Yet, dark glasses or not they find themselves suffering from head
admin
2014-11-27
24
问题
Many people believe the glare from snow causes snow blindness. Yet, 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 the 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 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, 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 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 snow blind 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______.
选项
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
答案
D
解析
细节题。根据短文第二段前半部分可知在白雪皑皑的地方,眼睛没有可关注的东西,而为了找到关注点。目光会不断地来回转移,这样就会造成眼珠、眼肌酸痛。故选项D正确。
转载请注明原文地址:https://jikaoti.com/ti/Uu9FFFFM
0
大学英语四级
相关试题推荐
A、Takeapart-timejobduringtheholiday.B、Askherparentsforhelp.C、Gotravellingaftersummerholiday.D、Giveuptheidea
A、Interesting.B、Helpful.C、Unpleasant.D、Meaningful.C观点态度题。女士问男士他的孩子们以后会不会成为作家,男士说他不希望自己的孩子成为作家,因为他认为写作是非常痛苦的工作。
A、Theyhavebeenappliedin3/4ofthestates.B、TheyaremadebytheThomasB.FordhamInstitute.C、Theyareclearerandstrong
Anewstudyshowsthatstudentslearnmuchbetterthroughanactive,iterative(反复的)processthatinvolvesworkingthroughtheirm
A、Itmeansmoredutiesthanbeingateacher.B、Itrequiresthemothertobewell-educated.C、Itpreventsthemotherfromworking
A、Theclassmeetsduringhisworkinghours.B、He’salreadyfamiliarwiththematerial.C、Hehasanotherclassatthesametime.
A、Itissupposedtobewarmandsunnyintermsoftheweatherforecast.B、Itwon’tgolikewhatthemanexpectsaccordingtothe
A、Becausetelevisionischeapertopurchase.B、Becausepeoplecouldseethesceneandthefiguresinmovements.C、Becausetelevi
A、Theweatherismildcomparedtothepastyears.B、Theyarehavingthecoldestwinterever.C、Theweatherwillsoongetwarmer.
A、Sheep.B、Donkeys.C、Snakes.D、Crocodiles.C事实细节题。短文中提到,这些大猴子也就是baboons,它们最怕的东西是蛇。
随机试题
完善教师道德激励机制是教师道德建设的关键。()
简述报关程序的三个阶段。
产后出血病因中最常见的是
患者神思恍惚,魂梦颠倒,心悸易惊,善悲欲哭,肢体困乏,饮食减少,舌色淡,脉细无力。治疗应首选的方剂是
在Ag-Ab凝集反应中,Ag过量时
男孩10岁,持续发热5天,阵发刺激性咳嗽。静脉滴注头孢曲松4天无效。精神差,双肺呼吸音粗,血象WBC7×109/L,中性粒细胞70%,淋巴细胞30%。胸部X线片示:左肺大片密度增高影。可能的诊断为
癌细胞来自小叶的终末导管及腺泡,未穿破基底膜,累及小叶癌细胞局限于中小导管内,管壁基底膜完整
根据《招标投标法》的规定,下列关于投标保证金的有效期表述不正确的是()
根据我国《义务教育法》的规定,下列表述中哪一种准确地定位了我国义务教育的性质()。
Oceanographyhasbeendefinedtheapplicationofall【S1】______sciencestothestudyofthesea.Beforethenine
最新回复
(
0
)