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
Some surveys show that a lot of people believe that the glare from snow causes snow-blindness. Yet, wearing dark glasses or not,
Some surveys show that a lot of people believe that the glare from snow causes snow-blindness. Yet, wearing dark glasses or not,
admin
2011-03-01
28
问题
Some surveys show that a lot of people believe that the glare from snow causes snow-blindness. Yet, wearing 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 actually does not cause snow-blindness in troops in snow-covered country. Rather, a man’s eyes frequently find nothing to focus on in a broad expanse of a wide snow-covered territory. His gaze, in consequence, continually shifts and jumps back and forth over the entire landscape in search of something he can look at. Finding nothing to focus on, hour after hour, the eyes never stop searching, and the eyeballs will become sore and eye muscles will ache. Nature reduces this uncomfortable feeling by producing more and more fluid which covers the eyeball. The fluid covers the eyeball in increasing quantity until vision becomes increasingly unclear. The result may be total, even though temporary, snow-blindness.
Experiments led the Army to a simple method of overcoming this problem. A small group of soldiers will be sent ahead of a main body of troops. They are trained to shake snow from evergreen bushes, creating a dotted line as they cross completely snow-covered landscape. Even these soldiers themselves throw lightweight, dark colored objects ahead, on which they, too, can focus. The men following them can then see something. Their gaze is arrested. Their eyes focus on a bush and, having found something to see, stop searching the snow-blanketed landscape. By focusing their attention on lone object at a time, the troops can cross the snow-covered wilderness without becoming hopelessly snow-blind or lost. In this way the problem of crossing a solid white territory is overcome.
The pioneers ahead of the main body of troops throw some lightweight, dark colored objests to ______.
选项
A、cross completely snow-covered landscape
B、prevent themselves from suffering snow-blindness
C、let the men behind them see something
D、warm themselves in the cold
答案
B
解析
细节题。第三段第三句话指出,走在大部队前面的先遣小分队在前进过程中也不断地向前面方向投掷深颜色、轻质地的物体,为他们自己的眼睛提供可看的东西,以克服雪盲现象。因此,正确应为B项。
转载请注明原文地址:https://jikaoti.com/ti/9cdsFFFM
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
Britainisnotjustonecountryandonepeople,evenifsomeofitsinhabitantsthinkso.Britainis,infact,anationwhichca
GenerationsofAmericanshavebeenbrought【C1】______tobelievethatagoodbreakfastisimportantforhealth.Eatingbreakfasta
Onwhatdayoftheweekwillthemagazinearrive?
Christeacheschildrentheguitar______.
Televisionisthemosteffectivebrainwashingmediumeverinventedbyman.Advertisersknowthistobe【C1】______.Childrenarea
Whena13-year-oldVirginiagirlstartedsneezing,herparentsthoughtitwasmerelyacold.Butwhenthesneezescontinuedfor
Whena13-year-oldVirginiagirlstartedsneezing,herparentsthoughtitwasmerelyacold.Butwhenthesneezescontinuedfor
Itisexcitingtoapplyforajobthatreallyappealstoyou.Inmakingyourapplication,thereareanumberofpointsforyout
AlbertEinsteinissaidtohavebeenaskedbyastudent,"Whatfindinghelpedyoumostwhenyouwere【C1】______thetheoryofrela
InEnglandrecentlythreeforeigngentlemenapproachedabusstop.Aboutfiveminuteslaterthebustheywantedcamealong.They
随机试题
人民法院审查行政诉讼案件原则上不得进行调解,但行政赔偿、补偿以及行政机关行使法律、法规规定的自由裁量权的案件可以调解。()
下列可诊断为无症状HCV携带者的是
A.β2受体激动剂B.β2受体阻断剂C.抗胆碱能药D.糖皮质激素E.肥大细胞膜稳定剂色甘酸二钠(色甘酸钠)属于
以下药材来源于百合科,药用根茎的是
确定建设工程安全作业环境及安全施工措施所需费用,应包括在()内。
期货公司变更法定代表人,国务院期货监督管理机构派出机构应当自受理申请之日起()内作出此准或者不批准的决定。
有限责任公司公开发行公司债券,应当符合的条件有( )。
上市公司的下列事项属于特别事项的是()。
近日一项研究显示,男性与女性在视觉能力上有较大区别:女性在对颜色的识别上要强于男性,而男性的视觉优势则体现在对远处物体的细节敏感度以及对快速移动物体的追踪能力上。研究人员称,这种区别的出现是因为男性与女性长期社会分工角色的不同。以下哪项如果为真,
下列叙述中,错误的是()。
最新回复
(
0
)