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
专升本
Many people believe the glare from snow causes snow blindness. Yet, wearing dark glasses or not, they find themselves suffering
Many people believe the glare from snow causes snow blindness. Yet, wearing dark glasses or not, they find themselves suffering
admin
2019-05-23
82
问题
Many people believe 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 Canadian Army has now determined that 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 barren snow - covered terrain. 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, they eyes never stop searching and the eyeballs become sore and the eye muscles ache. Nature offsets this irritation by producing more fluid which covers the eyeball. The fluid covers the eyeball in increasing quantity until vision blurs, then is obscured, and the result is total, even though temporary, snow blindness.
Expriments 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 corss 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.
The scouts shake snow from evergreen bushes in order to _________.
选项
A、leave the men behind something to see
B、beautify the landscape
C、warm themselves in the cold
D、prevent the men behind from losing their way
答案
A
解析
细节理解题。根据第三段,“The men following can then see something”可知,是为了给后续部队提供可看的目标物,故选A项。
转载请注明原文地址:https://kaotiyun.com/show/0OJC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
Yourmobilephoneneeds________.Youshouldbetterhaveitdonetomorrow.
Lifeismoreenjoyabletopeople_______areopentonewideas.
Hedoesn’tdoitfornothing.
Americansarepoundoftheirvarietyandindividuality,yettheyloveandrespectfewthingsmorethanauniform,whetheritis
Although________happenedinthatcountrysoundslikesciencefiction,itcouldoccurelsewhereintheworld.
AOnlybypracticeBwillyoubeabletoimproveyourCspeakingEnglishandgraduallyDspeakfluently.
Shoppingforclothesisnotthesameexperienceforaman【C1】______itisforawoman.Amangoesshoppingbecauseheneedssomet
Accordingtosociologists,thereareseveraldifferentwaysinwhichapersonmaybecomerecognizedastheleaderofasocialgr
Accordingtosociologists,thereareseveraldifferentwaysinwhichapersonmaybecomerecognizedastheleaderofasocialgr
随机试题
男,49岁。间断喘息3年,无明显规律,发作期间无不适,此次因“气喘3小时”来院,查体:T36.9℃,端坐呼吸,口唇紫绀,双肺呼吸音低,呼气相明显延长,未闻及哮鸣音,血常规WBC8.3×109/L,N0.75。该患者最可能的诊断是(
CD2分子又称为
产后一周称分娩结束,产妇逐渐恢复到孕前状态是
AⅠa期BⅠb期CⅡ期DⅢa期EⅢb期子宫内膜癌术后病理报告:肿瘤侵犯宫颈内膜间质,FIGO2009分期为
产生胆汁的是
A.氯霉素B.多西环素C.土霉素D.四环素E.米诺霉素
完全竞争市场必须具备哪些特征?
在电流速断保护中,动作电流引入可靠系数的原因包括()。
我国第一台电子计算机诞生于哪一年?
(1)LastmonthHansenTransmissionsInternational,amakerofgearboxesforwindturbines,waslistedontheLondonStockExchang
最新回复
(
0
)