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
公务员
Many people believe the glare from snow causes snow blindnenss. Yet, dark glasses or not, they find themselves suffering from he
Many people believe the glare from snow causes snow blindnenss. Yet, dark glasses or not, they find themselves suffering from he
admin
2011-01-01
29
问题
Many people believe the glare from snow causes snow blindnenss. Yet, dark glasses or not, they find themselves suffering from headaches and watering eyes, and even snowblindness, when ex- posed 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 lanscape. By focusing their attention on one object at a time, the men can cross the snow without becoming hopelessly snowblind or lost. In this way the problem of crossing a solid white terrain is overcome.
The scouts shake snow from evergreen bushes in order to______.
选项
A、give the men behind something to see
B、beautify the landscape
C、warm themselves in the cold
D、prevent the men behind from losing their way
答案
A
解析
由第三段的第二句和第三句可知,这样做的最终目的是让后面的人能看见东西。故选A。
转载请注明原文地址:https://jikaoti.com/ti/qMX4FFFM
本试题收录于:
中学英语题库教师公开招聘分类
0
中学英语
教师公开招聘
相关试题推荐
用比值法来定义新的物理量是物理学中的一个重要方法,请你:谈谈你对用比值法定义物理量的理解。
Theevidenceforharmonymaynotbeobviousinsomefamilies.Butitseemsthatfouroutoffiveyoungpeoplenowgetonwithth
Therearemanykindsoffriends.Somearealways【C1】______you,butdon’tunderstandyou.Somesay"onlyafewwordstoyou,but
Oneafternoon,mysonAdamaskedme,"Areallpeoplethesameeveniftheyaredifferentincolor?"Ithoughtforaminute,
TheotherdaymybrotherTomwasbeginninghis56.______motorbikethenourneighbor,Marycameou
ForgetTwitterandFacebook,GoogleandtheKindle.Televisionisstillthemostinfluentialmediumaround.Indeed,formanyof
Americancitiesaresimilartoothercitiesaroundtheworld:Ineverycountry,citiesreflectthevaluesoftheculture.Americ
Americancitiesaresimilartoothercitiesaroundtheworld:Ineverycountry,citiesreflectthevaluesoftheculture.Americ
IwillneverforgettheyearIwasabouttwelveyearsold.Mymothertoldusthatwewouldnotbe【16】Christmasgiftsbecausethe
Manylifestylepatternsdosuch______greatharmtohealththattheyactuallyspeedup______weakeningofthehumanbody.
随机试题
中国甲公司与日本乙公司拟共同设立一中外合资经营企业。在拟订的下列合同条款中,哪一条是违法的?
在套用完变压器概算定额后,()工作内容还需套用其他定额。
下列交易或事项所产生的现金流量中,属于“投资活动产生的现金流量”的有()。
人们欣赏名画《蒙娜丽莎》时,陶醉在“永恒的微笑”中,感到身心非常愉悦。这种情感是()。(2014.贵州)
当国际奥委会主席宣布2008年奥运会在中国北京举行时,此时全场都非常兴奋,大家都鼓掌以示高兴,这种情绪属于()。
Itisdifficulttocomprehend,buteverythingyouhaveeverseen,smelt,heardorfeltismerelyyourbrain’sinterpretationof
下列选项中,属于心理学研究对象的是
(2015年单选1)原铁道部部长刘某因受贿罪、滥用职权罪被追究刑事责任。有人认为,在对刘某量刑时“应考虑他对中国高铁建设的贡献”。这种说法违背了我国刑法中的()。
Yesterdaymyauntboughtsomenew______forherflatattheseaside.
TheAmericandefinitionofsuccessislargelyoneofacquiringwealthandahighermaterialstandardofliving.Itisnotsurpri
最新回复
(
0
)