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
25
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] 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
细节题。根据短文第二段前半部分可知在白雪皑皑的地方,眼睛没有可关注的东西,而为了找到关注点,目光会不断地来回转移,这样就会造成眼珠疼,眼肌酸痛。故选项D正确。
转载请注明原文地址:https://tihaiku.com/zcyy/2810064.html
相关试题推荐
[originaltext]M:Soyoureallybelievethatclothescarryakindofmessagefor
[originaltext]M:Soyoureallybelievethatclothescarryakindofmessagefor
Alotofpeopleinstinctivelybelieve—withoutreallyknowing—thatpoorreade
Alotofpeopleinstinctivelybelieve—withoutreallyknowing—thatpoorreade
Alotofpeopleinstinctivelybelieve—withoutreallyknowing—thatpoorreade
Alotofpeopleinstinctivelybelieve—withoutreallyknowing—thatpoorreade
Alotofpeopleinstinctivelybelieve—withoutreallyknowing—thatpoorreade
Peoplewhosejobsrequirethemtositforlongperiodsoftimesufferasmuc
Peoplewhosejobsrequirethemtositforlongperiodsoftimesufferasmuc
Peoplewhosejobsrequirethemtositforlongperiodsoftimesufferasmuc
随机试题
Youaregivenaseriesofnumbers.Yourtaskistoseehowtheyformarelations
Wantproductivityandsuccessinthebusinessworld?Orareyouseekingtob
已充分稳定的二阶系统,要减小超调量、增大响应速率,应选择校正方式()。A.串联超
下列关于橘子的功效与作用,说法错误的是:A.橘子中的维生素A能够增强人体在黑暗环
脑脊液鼻漏伴单侧嗅觉丧失,提示瘘孔位于:()A.鼻窦 B.额窦后壁 C.
一早产儿,出生体重2.5kg,生后第1天其需水量及中性温度应分别为A.60~10
不适合用放射性碘治疗的甲亢患者包括A.严重心、肝、肾衰竭 B.20岁以下、妊娠
某建设单位经相关主管部门批准,组织某建设项目全过程总承包(即EPC模式)的公开招
作业人员工作中正常活动范围与110kV设备带电部分的安全距离小于()m时,设备应
如果甲产品和乙产品的需求交叉弹性系数是负数.则说明甲产品和乙产品( )。A.无
最新回复
(
0
)