首页
登录
职称英语
Many people believe the glare from snow causes snow blindness. Yet, with dar
Many people believe the glare from snow causes snow blindness. Yet, with dar
游客
2024-02-06
24
管理
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. [br] 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://tihaiku.com/zcyy/3428112.html
相关试题推荐
[originaltext]Wouldyoubelievethatthefirstoutstandingdeafteacherin
[originaltext]Wouldyoubelievethatthefirstoutstandingdeafteacherin
[originaltext]Mostpeoplewhostartworkingoutinhopesofsheddingpounds
[originaltext]M:Ican’tbelievemyliteratureteacherismakingmereadPride
[originaltext]Peopleallovertheworldtodayarebeginningtohearandlea
[originaltext]Peopleallovertheworldtodayarebeginningtohearandlea
Fightunhealthyfood,notfatpeopleIt’shardlybreakin
Fightunhealthyfood,notfatpeopleIt’shardlybreakin
Fightunhealthyfood,notfatpeopleIt’shardlybreakin
Fightunhealthyfood,notfatpeopleIt’shardlybreakin
随机试题
HiringCelebritiesasVisitingProfessors1.目前有不少大学请明星当客座教授2.对这一现象,人们看法不同3.我的看
[img]2012q1/ct_etoefm_etoefspeakc_1918_20121[/img]Anachievementtestisdiffere
Thegreatadvance【C1】______rockettheory40yearsagoshowedthatliquid-fue
[originaltext]W:Lookatthatsky!Ican’tbelieveIforgotmyumbrellaagain!M
打字人员在抄录上表时因粗心输错了一个数据,该数据可能是()A.5536
办理房屋登记的程序包括( )。A:申请 B:受理 C:审核 D:公证
根据合同法律制度的规定,下列关于运输合同的表述中,正确的是()。A.货物在运输
汉字输入码(即外码)是指将汉字通过键盘输入计算机而设计和代码。输入代码的方案可以
下列关于可变更、可撤销合同特征的说明,正确的是()。A.可撤销合同就是效力待定
知识点:宫内节育器取出术下列情况属于不能取环的是 A.绝育者 B.改用其它
最新回复
(
0
)