首页
登录
职称英语
Many people believe the glare from snow causes snow blindness. Yet, dark gla
Many people believe the glare from snow causes snow blindness. Yet, dark gla
游客
2025-04-23
27
管理
问题
Many people believe the glare from snow causes snow blindness. Yet, dark glasses or not they find themselves suffering from headaches and watering eyes, and even snowblindness, 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, snowblindness. ,
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 snowblind or lost In this way the problem of crossing a solid white area is overcome. [br] The eyeballs become sore and the eye muscles ache because________.
选项
A、tears cover the eyeballs
B、the eyes are annoyed by blinding sunlight
C、the eyes are annoyed by blinding snow -
D、there is nothing to focus on
答案
D
解析
本题问眼珠及眼部肌肉酸痛的原因。从第二段第二句和第四句可以确定D为正确选项。
转载请注明原文地址:https://tihaiku.com/zcyy/4050472.html
相关试题推荐
Sincethedawnofhumaningenuity,peoplehavedevisedevermorecunningtoo
Accordingtothelatestpopulation______thenumberofpeopleintheworldwillg
Oldpeoplearealwayssayingthattheyoungpeoplearenot【51】theywere.The
Oldpeoplearealwayssayingthattheyoungpeoplearenot【51】theywere.The
Oldpeoplearealwayssayingthattheyoungpeoplearenot【51】theywere.The
Oldpeoplearealwayssayingthattheyoungpeoplearenot【51】theywere.The
Oldpeoplearealwayssayingthattheyoungpeoplearenot【51】theywere.The
Oldpeoplearealwayssayingthattheyoungpeoplearenot【51】theywere.The
Oldpeoplearealwayssayingthattheyoungpeoplearenot【51】theywere.The
Oldpeoplearealwayssayingthattheyoungpeoplearenot【51】theywere.The
随机试题
I’llWritebackassoonasI__________yourletter.A、WillgetB、getC、havegotB
TheStruggleAgainstSuperbugsARarelydoesabacteriumbe
演员管理属于艺术创作组的工作内容。( )
简要说明经济全球化和经济区域集团化之间的关系。
下列关于建设工程可调总价合同的说法中,正确的是( )。 A、合同执行中承包方
下列对维生素K的药理作用的叙述正确的是A.抑制维生素K的代谢 B.影响维生素的
(2018年真题)用人单位招用人员的禁止行为有()。A.提供虚假招聘信息,发布
A.乳糖操纵子(Lacoperon) B.转录因子IID(TFIID) C
胃体部癌肿发生淋巴转移,一般首先受累的淋巴结群位于( )。A.腹主动脉旁 B
一般说来,下列哪项不是糖皮质激素的禁忌证A、急性粟粒性肺结核 B、糖尿病 C
最新回复
(
0
)