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
41
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
called
解析
转载请注明原文地址:https://kaotiyun.com/show/M7Td777K
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
UsuallythereisasubstantialincreaseintheamountofmailduringtheChristmasseason.
Accordingtothepassage,someengineersaretryingtoimprovethehandlebarsbecause______.Thepassageimpliesthat______.
Awell-writtencompositionneedgoodchoiceofwordsandclearorganizationamongotherthings.
LocalNewspapersInBritain1.Britainhasalargecirculation(发行量)ofthenationalnewspapers.TheDailyMirrorandTheDaily
NewIdeasIceland’sPresidentOlafurGrimssonistryingtodrivecarbondioxide(二氧化碳)undergroundto
ImproveComputer-researchSkillsLikemanycollegestudents,JoseJuarezcarriesaroundapocket-sizedcomputerthatletshi
TheDifferencebetweenManandComputerWhatmakespeopledifferentfromcomputerprograms?Whatisthemissingelementthat
(31)withthehumaneye,acat’s(32)havemorerodsthancones,(33)helpsthecatseeinthedark.Catsalsohaveellipticalp
(31)withthehumaneye,acat’s(32)havemorerodsthancones,(33)helpsthecatseeinthedark.Catsalsohaveellipticalp
Between1852,when【C1】______wasfirstestablishedthatMountEverestwasthehighestmountainonearth,and1953,whenEdmundHi
随机试题
轻度或中度高血压病人,手术前应使血压
如下哪项是蛛网膜下腔出血后必须绝对卧床休息的时间界限
咳嗽咽痒,咯痰不爽,或微有恶风发热,舌苔薄白,脉浮缓。方剂选用
A.四肢麻木,腰背剧痛B.手足抽搐,血压下降C.黄疸,血红蛋白尿D.头部胀痛,面部潮红E.口唇水肿,两肺闻及哮鸣音
建设工程项目实施过程中,质量控制系统涉及多个质量责任主体,其中属于监控主体的是()。
洪某系裕华区东府中心村村民。因所住房屋已破旧不堪拟大修,遂向区规划局提出申请要求批准其翻修房屋。区规划局作出不予批准决定。洪某遂向市规划局申请复议。市规划局作出维持区规划局不予批准决定的复议决定。洪某遂向区法院起诉,请求法院判决确认区规划局的不作为行为违法
三星堆遗址最具代表性的器物是()。
在社会工作研究方法中,()结论可以推论。
设事件A,B,C两两独立,则事件A,B,C相互独立的充要条件是().
A、Itisdirtyinseveralplaces.B、Ithasafewtearshereandthere.C、Itisreallywornout.D、Itisoutofdate.A选项中的Itisd
最新回复
(
0
)