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
职业资格
Many people believe the glare from snow causes snow-blindness. Yet, dark glasses or not, they find themselves suffering from hea
Many people believe the glare from snow causes snow-blindness. Yet, dark glasses or not, they find themselves suffering from hea
admin
2021-08-09
18
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 snow-blindness, when exposed to several hours of "snow light".
The United States 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, the eyes never stop searching and the eyeballs become sore and the eye muscles ache. Nature offsets this irritation by producing more and fluid which covers the eyeball. The fluid covers the eyeball in increasing quantity until vision blurs, then is observed, 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 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.
To prevent headaches, watering eyes and blindness caused by the glare from snow, dark glasses are______.
选项
A、indispensible
B、useful
C、ineffective
D、available
答案
C
解析
根据第一段“Yet,dark glasses or not,they find themselves suffering from headaches andwatering eyes,and even snow-blindness”可知,深色眼镜并不起作用,故选C。
转载请注明原文地址:https://jikaoti.com/ti/ipD9FFFM
本试题收录于:
英语学科知识与教学能力题库教师资格分类
0
英语学科知识与教学能力
教师资格
相关试题推荐
某景区利用当地著名佛教庙宇进行宗教文化资源的开发利用,取得了较好的经济效益,同时也出现了商业开发过度、管理不规范以及“僧人”摆地摊、占卦算命等问题,当地政府为此制定景区游览环境综合整治活动方案,进行整改。据此回答下列问题。规范宗教文化资源的开发利用(
Sociolinguistsstudyvarietiesoflanguageand,accordingly,willbeinterestedintheanalysisofallofthefollowingEXCEPT__
Wehadtobepatientbecauseit______sometime______wegotthefullresults.
Listeningtoloudmusicatrockconcerts______causedhearinglossinsometeenagers.
Whenareadertriestoguessthemeaningofanewwordbasedonthecontextualclue,whichoneofthefollowingapproachesishe
Theworldmarketis______changing.Wemustanticipatethechangesandmaketimelyadjustments.
WhichofthefollowingcorrectlydescribestheEnglishphoneme/t∫/?
ChinesewriterCaoWenxuanwasawardedtheChristianAndersonAwardin2016,makinghimselfthefirstChinese______suchaprize.
—Haveyouheardaboutthatfireinthemarket?—Yes,fortunatelynoone______.
Undertheregulations,allthepassengers________remainintheirseatsuntiltheplanelandssafely.
随机试题
组织的文化形象()
兴奋传导速度最慢的心肌细胞是
结核病原发综合征的典型X线胸片表现是
在下列事件中,可引起质量波动的偶然性原因是()。
在北欧国家,社会阶级具有很高的组织化程度。无论是劳方还是资方都被有效地组织起来进行利益争斗,工会的影响力和集中化程度也很高,从而为各利益群体之间进行政治协商提供了基础。政府也很早就介入到劳资关系的制度化过程中。国家或政府作为公共利益的代表,参与和介入到这一
针对社区10位独居老人,社会工作者小王策划了“温馨电话问候”服务,动员社区居民以志愿者身份打电话给独居老人,了解他们的日常生活情况,传递温暖与关爱。为有效管理志愿者,小王对居民志愿者的需要进行评估的内容应包括()。[2010年真题]
音色:甜美
静态链表中指针表示的是()。
对象状态的持久化是通过()实现的。
若变量已正确定义为int型,要通过语句seanf("%d,%d,%d",&a,&b,&C;给a赋值1、给b赋值2、给c赋值3,以下输入形式中错误的是(注:口代表一个空格符)()。
最新回复
(
0
)