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
(31) with the human eye, a cat’s (32) have more rods than cones, (33) helps the cat see in the dark. Cats also have elliptical p
(31) with the human eye, a cat’s (32) have more rods than cones, (33) helps the cat see in the dark. Cats also have elliptical p
admin
2009-06-24
27
问题
(31) with the human eye, a cat’s (32) have more rods than cones, (33) helps the cat see in the dark. Cats also have elliptical pupils that open and close faster and can become larger than our round (34). In addition, cats and some (35) nocturnal animals have a mirror like membrane on the back of their eyes, which reflects the light passing through the rods back through them in the, opposite direction, This "double exposure" allows cats to (36) well in near darkness.
The human eye changes gradually (37) age, (38) the changes are critical. In darkness, eyes adapt (39) widening the pupils to let in as much light as possible. (40) you get older, these muscles weaken and do not respond as well (41) the need to let in more light.
The result is a small (42) when you try to see in poor light. It’s (43) if your eyes were still young but you were wearing sunglasses at night. There is also evidence that as we age we lose more rods (44) cones.
In the young eye, rods (45) cones by nine to one in the part of the retina called the macula. But an autopsy study of older adults found that while the cones (46) intact, almost a third of the rods in the macula had been lost.
The less responsive muscles in the iris also affect the eye’s ability to adjust when the intensity of light changes, (47) as when a car with its headlights on approaches and then passes.
In older eyes, this phenomenon, (48) dark adaptation, takes longer, which (49) you see less well in the dark after being in the light, and vice versa. The diminished number of rods may be a factor, but in addition, the light-sensitive pigment in the rods regenerates more slowly in (50) eyes.
选项
答案
eyes
解析
转载请注明原文地址:https://kaotiyun.com/show/K7Td777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
BritishGovernmentWhenBritishvotersgotothepollsduringGeneralElectionstodecide(51)willgovernthemtheyusuallyhave
For2,005years,Irelandhasbeenthebestplaceforhumanstolivein.TheUnitedStatesofAmericaisamongthetop10countr
AKeepingGoodRelationswithLocalBusinessmenBServiceProvidedbyLocalNewspapersCLargeCirculationoftheNationalNe
LocalNewspapersInBritain1.Britainhasalargecirculation(发行量)ofthenationalnewspapers.TheDailyMirrorandTheDaily
ImproveComputer-researchSkillsLikemanycollegestudents,JoseJuarezcarriesaroundapocket-sizedcomputerthatletshi
Weexploredthepossibilityofexpansionattheconference.
TheDifferencebetweenManandComputerWhatmakespeopledifferentfromcomputerprograms?Whatisthemissingelementthat
(31)withthehumaneye,acat’s(32)havemorerodsthancones,(33)helpsthecatseeinthedark.Catsalsohaveellipticalp
(31)withthehumaneye,acat’s(32)havemorerodsthancones,(33)helpsthecatseeinthedark.Catsalsohaveellipticalp
(31)withthehumaneye,acat’s(32)havemorerodsthancones,(33)helpsthecatseeinthedark.Catsalsohaveellipticalp
随机试题
以下关于流行病学实验中的盲法叙述正确的是()。
疫毒痢的治法有()
母猪,4岁,直肠垂脱于肛门之外,直肠黏膜暗红,水肿;食欲不振,精神倦怠,体弱乏力,口色淡白,脉象虚弱。若以中药方剂治疗,应以何方剂为主进行加减
A.麦角骨化醇B.胆骨化醇C.维生素D2D.25-(OH)D3E.1,25-(OH)2D3经肾脏羟化后的维生素D是
已知某工程双代号网络计划的计划工期等于计算工期,且工作M的开始节点和完成节点均为关键节点,则该工作()。
集合资产管理计划推广活动结束后,证券公司应当聘请具有证券相关业务资格的会计师事务所对集合资产管理计划进行()。
道德知识的获得和道德观念的形成是属于()。
请根据以下各小题的要求设计VisualBasic应用程序(包括界面和代码)。(1)在名称为Forml、标题为“图片”的窗体上画一个名称为Imagel的图像框,其高为2500、宽为2000。请通过属性窗口设置适当属性,装入考生目录下的图片文件piclJpg
Youmaysaythatthebusinessofmarkingbooksisgoingtoslowdownyourreading.(31)probablywill.That’soneofthe(32)fo
WhatwilltheweatherbelikeinSeattle?
最新回复
(
0
)