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
2023-07-05
50
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/2810066.html
相关试题推荐
MostAmericansconsiderthemselvesfriendlypeople.FolksinthesouthernUn
MostAmericansconsiderthemselvesfriendlypeople.FolksinthesouthernUn
MostAmericansconsiderthemselvesfriendlypeople.FolksinthesouthernUn
MostAmericansconsiderthemselvesfriendlypeople.FolksinthesouthernUn
MostAmericansconsiderthemselvesfriendlypeople.FolksinthesouthernUn
Accomplishedteachersofworldlanguagesarekeenlyawarethatyoungpeople
Accomplishedteachersofworldlanguagesarekeenlyawarethatyoungpeople
Accomplishedteachersofworldlanguagesarekeenlyawarethatyoungpeople
Accomplishedteachersofworldlanguagesarekeenlyawarethatyoungpeople
Accomplishedteachersofworldlanguagesarekeenlyawarethatyoungpeople
随机试题
Itmayturnoutthatthe"digitaldivide"--oneofthemostfashionableof
材料: 观察植物细胞 目的要求: (1)制作植物细胞的临时装片,学习
2011年我国全年货物进出口总额36421亿美元,比上年增长22.5%。其中,
财务报表的作用主要有()。A.财务人员核对账目 B.国家有关部门进行宏观经济调
通信网中的()是通信网通信的汇点和终点,亦称原始消息和发射信号间的交换。A.
下列关于头肩顶形态的说法中,正确的是()。A:一般来说,左肩与右肩高点大致相等,
(2019年真题)某项目环境影响评价需要对环境空气质量进行现状补充监测,下列监测
新生儿败血症最常见的病原菌是( )。A.大肠杆菌 B.绿脓杆菌 C.链球菌
某工程项目施工采用《施工合同条件》,工期为15个月。承包方投标所报工期为13个月
(2011年真题)根据城市、镇规划区的建筑工程,规划许可证包括建设用地规划许可证
最新回复
(
0
)