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, with dark glasses or not, they find themselves suffering fro
Many people believe the glare from snow causes snow blindness. Yet, with dark glasses or not, they find themselves suffering fro
admin
2015-01-31
26
问题
Many people believe the glare from snow causes snow blindness. Yet, with 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 overcomed.
Snow-blindness may be avoided by______.
选项
A、concentrating on the solid white terrain
B、searching for something to look at in snow-covered terrain
C、providing the eyes with something to focus on
D、covering the eyeballs with fluid
答案
C
解析
细节题。短文最后一段倒数第二句指出By focusing their attention on one object at a time,the man can cross the snow without becoming hopelessly snow blind or lost.即把目光聚焦在某个东西上,就可以避免雪盲。故选项C正确。
转载请注明原文地址:https://jikaoti.com/ti/MA4FFFFM
0
大学英语四级
相关试题推荐
A、Itisabestsellerfortheaverageperson.B、Itiswrittenforthosewhostudytheuniverse.C、Itisreadmostlybyhisfollow
Byimposingstrictrulesaboutalcohol,parentscanreducetheirkids’impulsestodrink,accordingtoanewstudy.【C1】_____
Byimposingstrictrulesaboutalcohol,parentscanreducetheirkids’impulsestodrink,accordingtoanewstudy.【C1】_____
Byimposingstrictrulesaboutalcohol,parentscanreducetheirkids’impulsestodrink,accordingtoanewstudy.【C1】_____
Byimposingstrictrulesaboutalcohol,parentscanreducetheirkids’impulsestodrink,accordingtoanewstudy.【C1】_____
Byimposingstrictrulesaboutalcohol,parentscanreducetheirkids’impulsestodrink,accordingtoanewstudy.【C1】_____
IoncerentedacaratanagencyinagarageinRome.Theparkingstructurewastightandpoorlylighted,andbeforeIevenexit
A、Privateschoolswereexpensive.B、Teacherswerenotgoodenough.C、Womencouldn’tlearnFrench.D、Womendidn’tlikeschooling.
A、Walkthedog.B、Getoutforsomeexercise.C、Gotothepethospital.D、Gototheanimalshelter.D行动计划题。女士说想养狗,男士提到在动物收养所能够买到更
随机试题
急性白血病骨髓移植的最佳时机是
横断面研究中,因为危险因素和疾病同时存在,而很难确定危险因素与疾病之间是否存在因果关系,这时容易产生的偏倚是
A.主细胞B.壁细胞C.银亲和细胞D.颈黏液细胞E.内分泌细胞胃底腺中能分泌内因子的细胞是
A、贝壳B、果肉C、果实D、种仁E、根茎肉豆蔻的来源是
属于影响中药药理作用机体因素的是()。
下列哪项行为属于我国法律规定的不正当竞争行为?()
善于迅速地辨明是非、合理地采取决定和执行决定的品质是意志的()。
2,2,4,8,32,256,()。
王亮是在校大学生,王亮是共青团员,所以在校大学生都是共青团员。以下哪项与题干的论证最为相似?
Thatanecologicalcrisisconfrontshumankindisnowsocentraltoourthinkingthatthenotionthathumanbeingsadapttotheir
最新回复
(
0
)