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
财经
Many people believe the glare from snow causes snow-blindness.Yet,dark glasses or not,they find themselves suffering from headac
Many people believe the glare from snow causes snow-blindness.Yet,dark glasses or not,they find themselves suffering from headac
admin
2015-06-25
40
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 glare from snow does not cause snowblindness in troops in a snow—covered country.Rather,a man’s eyes frequently find nothing tofocus on in a broad expanse of barren snow—covered terrain.So his gaze continually shifts andjumps 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 asthey 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 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.
To prevent headaches,watering eyes and blindness caused by the glare from snow,dark glasses are__________.
选项
A、indispensible
B、useful
C、ineffective
D、available
答案
C
解析
根据第一段“Yet,dark glasses or not,they find themselves suffering from headaches and watering eyes.and even snow—blindness’’可知,深色眼镜并不起作用,故选C。
转载请注明原文地址:https://kaotiyun.com/show/4pgc777K
本试题收录于:
英语题库银行系统招聘考试分类
0
英语
银行系统招聘考试
相关试题推荐
Treesshouldonlybepruned(修剪)whenthereisagoodandclearreasonfordoingsoand,fortunately,thenumberofsuchreasonsis
Scienceisadominantthemeinourculture.Sinceittouchesalmosteverytacetofourlife.educatedpeopleneedatleastsomeac
It’shardtosayforsurewhatthenextbigthingwillbe,buttheseitemsmadethelistof10emergingtechnologytrendsthatwil
PassageTwoOverthepastdecade,thousandsofpatentshavebeengrantedforwhatarecalledbusinessmethods.Amazon.comreceiv
Haveyoueverwonderedwhatourfutureislike?Practicallyallpeople41adesiretoDredicttheirfuture42.Mostpeopleseemincl
Exchangelossesfromtransactionsneedtobeassessed________.
IntheUnitedStates,therewasanunusualtaletellingofthedaughterofamechanic(技工)•Onedaywhilewalkingalongthebankof
IntheUnitedStates,therewasanunusualtaletellingofthedaughterofamechanic(技工)•Onedaywhilewalkingalongthebankof
Fiveyearsago,DavidSmithworeanexpensivesuittoworkeveryday."Iwasaclothesaddict,"hejokes,"Iusedtocarryafre
Ms.Arroyasaysthatwhenworkshop______beginstoslowdown,itmaybetimetohiremoreworkers.
随机试题
用况模型是使用客户语言来描述的,而分析模型却是使用_________语言来描述的。
微分方程xy"-y’=0的通解是()
患者,男性,26岁,24年来尿频、尿急、尿痛,有时尿混浊,伴终末血尿,一般抗生素无效。尿液检查:脓球40~50个/HP,红细胞20~30个/HP,蛋白(+)肾切除术后抗结核治疗过程中,如果多次结核菌检查阴性,病人尿频程度较术前反而明显加强,导致尿频的最可能
地下工程防水,顶板卷材防水层上的细石混凝土保护层厚度不应小于70mm,防水层为单层卷材时,在防水层与保护层之间应设置()。
甲与某施工企业签订了一份2年期的劳动合同,合同中约定的生效时间为2014年5月1日,为了考察甲是否具备相应的工作能力,合同约定了试用期,则试用期最长截止于()。
同一投资组合或不同投资组合之间可以在同一交易日内进行反向交易。()
有面值为8分、1角和2角的三种纪念邮票若干张,总价值为1元2角2分,则邮票至少有( )。
[*]
完成某信息系统集成项目中的一个最基本的工作单元A所需的时间,乐观的估计需8天,悲观的估计需38天,最可能的估计需20天,按照PERT方法进行估算,项目的工期应该为(1),在26天以后完成的概率大致为(2)。(2)
设窗体上有一个列表框控件List1,含有若干列表项。以下能表示当前被选中的列表项内容的是
最新回复
(
0
)