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
51
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.
When the eyes ache, tears are produced to_________.
选项
A、loosent the muscles
B、remedy snow blindness
C、clear the vision
D、ease the irritation
答案
D
解析
细节理解题。根据第二段“Nature offsets this irritation by producing more fluid which covers the eyeball”可知,眼泪的产生是为了缓解刺激,故选D项。
转载请注明原文地址:https://kaotiyun.com/show/SOJC777K
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
ItiscommonlybelievedintheUnitedStatesthatschooliswherepeoplegotogetaneducation.Nevertheless,ithasbeensaid
________difficultieswemaycomeacross,we’llhelponeanothertoovercomethem.
A.Ithinkyoungpeopleshouldhavethefreedomandthespacetomaketheirowndecisions.B.Theyseemedtohavereachedanagr
A、Inafast-foodrestaurantB、AtashoppingcenterC、AtacountyfairD、InabakeryC
A、Itallowshimtomakealotoffriends.B、Itrequireshimtoworklonghours.C、Ithelpshimunderstandpeoplebetter.D、Iten
A、Designingbettercars.B、Buildingmorehighways.C、Increasingpeople’sawarenessoftrafficproblems.D、Enhancingdrivers’sen
A、Thursdayevening,from7:00to9:45.B、FromSeptember1toNewYear’sEve.C、EveryMonday,lastingfor12weeks.D、Threehours
TheboyAcalledTomBwasbornCinDthemorningofMay2nd,1990.
InBritainandothercountries,youngpeoplesometimestakea"gapyear",ayearoffbetweenhighschoolandcollege.Thiside
随机试题
领导决策中以“满意标准”代替“最优标准”就是【】
乳痈肿痛可用何药
自汗、盗汗并见,其病机是()
在常用的账务处理程序中,共同的财务处理工作有()。
招募说明书的主要内容不包括()。
为抑制通货膨胀,中央银行可以采取的公开市场操作是()。
不规则需求是指某些物品或者服务的市场需求在不同季节,或一周不同日子,甚至一天不同时间上下波动很大的一种需求状况。根据上述定义,下列哪项属于不规则需求?
以太网中的计算机相互通信时,为了避免冲突,采用下面( )方法和协议。
打开查询设计器建立查询的命令是
DothefollowingstatementsagreewiththeviewsofthewriterinReadingPassage2?Inboxes16-21onyouranswersheetwriteY
最新回复
(
0
)