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
2014-12-31
45
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.
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,这样就会造成眼珠疼,眼肌酸痛。故选项D正确。
转载请注明原文地址:https://kaotiyun.com/show/Unq7777K
0
大学英语四级
相关试题推荐
Itturnsoutthatagoodnight’srestisgoodforbusiness.One-thirdofAmericanworkersaren’tsleepingenoughtofunction
Itturnsoutthatagoodnight’srestisgoodforbusiness.One-thirdofAmericanworkersaren’tsleepingenoughtofunction
Livinginatimewhenanever-increasingnumberofnewsproviderspushaconstantstreamofheadlinesatuseveryday,peopleca
A、Itisdifficultforstudentsinthedigitalagetoconcentrate.B、MorethanhalfofAmericanteenagerslikesurfingonline.C、
ThefederalautomobileefficiencystandardsannouncedthisweekareanimportantsteponAmerica’spathtoalower-carbonandmo
Mostofuswouldshyawayfrommakingpurchasesinaforeigncountryifwedidn’tknowtheexchangerate.Yet,ifprivacyisthe
AsaprofessoratalargeAmericanuniversity,Ioftenhearstudentssaying:"I’monlya1050."Theunluckystudentsarespeaki
AsaprofessoratalargeAmericanuniversity,Ioftenhearstudentssaying:"I’monlya1050."Theunluckystudentsarespeaki
Ifyouaretryingtodoyourbitforsustainabilityandsavewaterbytakingshortershowers,thenanewreportonsustainabilit
随机试题
简述经济全球化的定义及特点。
有关会阴湿热敷溶液的温度及药液浓度,下列正确的是
为患者进行体格检查时医生首先做到的是()
分年投资计划表中包含()项目。
《中华人民共和国知识产权海关保护条例》所称知识产权海关保护,是指海关对与进出口货物有关并受中华人民共和国法律、行政法规保护的下列权利:
某外贸公司2014年8月从生产企业(一般纳税人)购入一批化妆品,取得增值税专用发票,支付价款40万元、增值税6.8万元,当月将该批化妆品全部出口,取得销售收入60万元。该外贸公司出口化妆品应退流转税()万元。(增值税出口退税率13%、消费税税率30
下列不属于直接人工效率差异形成原因的是()。
诱导需求,医生在涉及自身经济利益的服务中,医生既是顾问,又是卫生服务的提供者,因此可以创造额外需求,即供方创造需求。根据上述定义,下列说法不正确的是:
规定小学教育“发展儿童身心,并培养儿童民族意识、国民道德基础及生活所必需的基本知识技能”的文件是
FoodwasteinSeattleisfinallymadeintoakindof
最新回复
(
0
)