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
2011-06-29
50
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.
A suitable title for this passage would be______.
选项
A、Snowblindness and How to Overcome It
B、Nature’ s Cure for Snowblindness
C、Soldiers in the Snow
D、Snow Vision
答案
A
解析
雪盲及如何避免雪盲是文章的主题,A为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/qv6O777K
0
考博英语
相关试题推荐
Areyoualwayssureyouknowwhatpeoplemeanwhentheytrytodescribetheirfeelingstoyou?Weusebothwordsandgesturesto
Areyoualwayssureyouknowwhatpeoplemeanwhentheytrytodescribetheirfeelingstoyou?Weusebothwordsandgesturesto
RecentreformeffortsAhavebeenfocusedonencouraginglifelongorrecurrenteducationtomeetBchangingindividualandsocial
Ascientificlawisliableatanytimetoneedmodifying.Thishappenswhenafactisdiscoveredwhichseemsto______whatthe
Despitetheirspartan,isolatedlifestyle,therearenostoriesofwomenbeingrapedorwantonviolenceagainstciviliansinthe
Whentelevisionfirstbegantoexpand,veryfewofthepeoplewhohadbecomefamousasradiocommentators【31】effectiveontelev
Largelyduetotheuniversitytraditionandthecurrentacademicmilieu,everycollegestudenthereworks______.
DearSirs,IamwritingtoyourofficetoattempttodeterminewhyIhaveencouragedsomanyobstaclestoreceivingmyproper
Thecargoboxhasalabel______onit.Pleasehandleitwithcare.
不管是好习惯还是坏习惯,都是逐渐养成的。当一个人重复做某件事时,一种看不见的力量驱使他去重复做同一件事,这样就养成了习惯。习惯一旦形成,要改掉它是困难的。所以,我们在形成习惯时要小心谨慎,这一点是非常重要的。小孩子常常会养成坏习惯。这些坏习惯中有的一直保留
随机试题
A.骨肉瘤B.乳腺癌C.非霍奇金淋巴瘤D.卵巢肿瘤E.肝细胞癌适合传统模式,术后辅助放化疗;或新辅助化疗后再手术的是
成年男性患者因误食鸡骨后吞咽痛2小时,间接喉镜未发现异物,应行的检查是
A.S区B.C区C.P区D.X区E.前S区HBcAg的编码区为
A.16岁以后B.3~6个月C.1~2岁D.4~6岁E.9~12岁唇腭裂序列治疗程序中语言评价及语言治疗时间为
个体工商户崔某从1999年起在某市经营一家饭店,向工商管理部门申请了营业执照。2006年因妻子生病亟须用钱,加上需要照顾病人无力继续经营,因而经协商将饭店转让给赵某,但双方并未到工商局办理营业执照的更名手续。2010年5月,赵某在经营过程中不慎致使多名顾客
下列有关各类电气装置施工程序的说法中错误的是()。
《学生伤害事故处理办法》认定,学校对学生安全负有的职责是()。
我国的社会保障制度改革的目标体系是建立与社会主义市场经济相适应的多层次的社会保障体系。(某省公开选拔党政领导干部公共科目考试试题)
Ifyou’reinahospitalandyourdoctorwantstomonitoryouwithoutbeingintheroom,there’sanappforthat.Therearealso
小江在制作公司产品介绍的PowerPoint演示文稿时,希望每类产品可以通过不同的演示主题进行展示,最优的操作方法是()。
最新回复
(
0
)