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
外语
What do cats’ eyes and highway reflector signs have in common? They both act as retro-reflectors(反响反射器). Almost everyone has
What do cats’ eyes and highway reflector signs have in common? They both act as retro-reflectors(反响反射器). Almost everyone has
admin
2013-12-08
32
问题
What do cats’ eyes and highway reflector signs have in common? They both act as retro-reflectors(反响反射器).
Almost everyone has noticed the frightening appearance of animals at night, as their eyes seem to glow in reflected light. One may think that just as reflective highway signs alert the motorists to many road hazards, so early man was often warned of danger by light from his campfire reflected in the eyes of lurking(潜伏)predators. In both cases, the light is ret-roreflected, giving it a particularly bright appearance.
The principles of retroreflection have been understood for centuries. However, it is only within the last fifty or sixty years, with the wide use of the automobile, that this area of optics(光学)has received important commercial application. Today, the uses of retroreflective materials are many. They are applied to bicycles and motor vehicles to make them more visible at night. And they assist pilots by improving the visibility of runway markers.
Large sums are spent for retroreflective materials, but purchasers have often found it difficult to specify performance for the materials they buy. Performance is of concern not only from the standpoint of the brightness of reflected light, but also from the standpoint of its color. It is important, for example, that the yellow hues(色调)in warning signals be of consistent color quality on all road signs so the driver can rely on color, as well as shape, to discern the signs’ meanings. Seven colors — silver, blue, yellow, red, green, brown and orange — are currently used for marking the interstate highway system.
The word "predator"(Para. 2)most probably means "______".
选项
A、early man
B、wild animal
C、evil person
D、campfire
答案
B
解析
本题属于词汇语义题。我们知道,文章在前两段谈论的是动物的眼睛和公路反光标志牌的共同之处。据此判断,第二段第二句讨论的应是这两者的警戒作用;而既然该句前半部分说的是公路反光标志牌,那么后半部分涉及的则应是动物的眼睛。因此,在四个选项中,B)的意思最为贴切。故选B)。
转载请注明原文地址:https://kaotiyun.com/show/oyDO777K
0
成人本科学位英语
相关试题推荐
Alittlegirlwasgivensomanypicturebooksonherseventhbirthdaythatherfatherthoughthisdaughtershouldgiveoneortw
Weallhaveupsanddowns,andusuallyit’sjustbesttoacceptthem.Butperhapsyouareconcernedaboutsomeonewhoseemstob
______thesequestionsmaysoundacademic,answerstothemcouldhaveprofoundeconomicandpoliticalsignificance.
Wethoughttheplantsalldiedfromlackofrain,andweredelightedtoseenew______appearing.
Personalityistoalargeextentinherent—A-typeparentsusuallybringaboutA-typeoffspring.Buttheenvironmentmustalsohav
(Advertising)givesusefulinformationabout(which)(products)to(buying).
Thenewsquicklyspreadthroughthevillage______thewarhadended.
Hardlyhadhefinishedhisspeech______theaudiencestartedcheering.
他直接去了纽约,没在香港停留。
SpeakerA:Youarewashingyourcarevenonvacation.Itmakesmefeelguilty.SpeakerB:________
随机试题
Ipreferthisbook______thatone.
关于柱式桥墩、墩柱配筋的说法,正确的有()。
操作风险分为()。
《中华人民共和国教师法》的基本内容包括()
国务院关于同意将××省××市列为国家历史文化名城的批复××省人民政府:《××省人民政府关于申报××市为国家历史文化名城的请示》(×政[2013]12号)________。现批复如下:一、同意将××市列为国家历史文化名城,同意
若人民币汇率持续上涨,可能出现下列哪些现象?()
某幼儿园聘请某甲担任幼儿班教师。某日上午,幼儿班课间休息时,某甲离校打电话,几个幼儿在教室里的炉火旁烤火,其中某乙(7岁)和某丙(5岁)发生打斗,某乙用石块将某丙的头部打破,而某丙则把某乙按在火炉上,某乙烫伤。为此某丙花去医药费1000元,某乙花去医药费4
Theincreaseinleisuretime,thehigherstandardofliving,theavailabilityofcarstoawiderrangeofthepopulationand,pe
Nouns,verbsandadjectivescanbeclassifiedas
Whydopeopleleavehometotravelaccordingtothepassage?
最新回复
(
0
)