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
2013-01-20
55
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 snowblindness, 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, snowblindness. ,
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 snowblind 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
本题问眼珠及眼部肌肉酸痛的原因。从第二段第二句和第四句可以确定D为正确选项。
转载请注明原文地址:https://kaotiyun.com/show/Jv2O777K
0
考博英语
相关试题推荐
Thedifferencebetweenaliquidandagasisobvious【l】theconditionsoftemperatureandpressurecommonlyfoundatthesurface
Duringaninternationalcrisis,many______messageswillgenerallyemanatefromthepresident’soffice.
Parentsofwailing(哀号)babies,takecomfort;Youarenotalone.Chimpanzeebabiesfuss.Seagullchickssquawk.Buryingbeetle
Aslongasherparentscanremember,13-year-oldKatieHarthasbeentalkingaboutgoingtocollege.Hermother,Tally,afinanc
Writingaboutmusicislikedancingaboutarchitecture,orsothesayinggoes.SometimesattributedtoFrankZappa,othertimes
Personalcomputersarenolongersomethingbeyondtheordinarypeople;theyareavailablethesedays.
Thegovernmentistryingtodosomethingto_____betterunderstandingbetweenthetwocountries.
Eighttimeswithinthepastmillionyears,somethingintheEarth’sclimaticequationhaschanged,allowingsnowinthemountain
随机试题
A.Councilman小体B.Russell小体C.Mallor小体D.脂质小体病毒性肝炎时,肝细胞固缩坏死形成
小儿,咳嗽气喘,喉中哮鸣,咳痰稀白,形寒,无汗,鼻流清涕,苔白腻,脉浮滑。其证候为
由于项目进度控制不同的需要和不同的用途,业主方和项目各参与方可以编制多个不同的建设工程项目进度计划系统,包括()。
确定保险代理关系的基础是( )。
()属于检索工具书。
2016年10月5号,由中国企业采用全套中国标准和中国装备建造,连接埃塞俄比亚和吉布提两国首都的非洲第一条现代电气化铁路正式通车,标志着中国铁路首次实现全产业链“走出去”。这条现代电气化铁路是()
首次提出心理学必须用实验方法进行研究,从而搭建了实验心理学的框架的心理学家是
A、 B、 C、 A反意疑问句与一般疑问句(IsthisMr.Yim’sdesk?)一样,要用Yes/No来回答。这道问题想确认这是不是Yim的办公桌,(A)项的回答“不是,他的办公桌是旁边那个”符合题意。(B)项
Youshouldspendabout20minutesonQuestions1-13,whicharebasedonReadingPassage1below.CuttySark:thefastestsailing
InAmericanhighschoolstoday,it’stakenasagiventhatextracurricular(课外的)activitiesbringstudentsofdifferentracesto
最新回复
(
0
)