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
46
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
remained
解析
转载请注明原文地址:https://kaotiyun.com/show/c7Td777K
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
BritishGovernmentWhenBritishvotersgotothepollsduringGeneralElectionstodecide(51)willgovernthemtheyusuallyhave
BeforeyoudownloadanythingfromtheInternet,youshouldfirstofall______.Ifyouwanttodownloadacertainprogram,whic
InterpretingthenewsThenewspapermustprovideforthereaderthefacts,unalloyed(纯粹的),unslanted(不偏不倚的),objectivelyselec
She’soneofthesmarteststudentsinthewholeschool.
NewIdeasIceland’sPresidentOlafurGrimssonistryingtodrivecarbondioxide(二氧化碳)undergroundto
NewIdeasIceland’sPresidentOlafurGrimssonistryingtodrivecarbondioxide(二氧化碳)undergroundto
TheDifferencebetweenManandComputerWhatmakespeopledifferentfromcomputerprograms?Whatisthemissingelementthat
(31)withthehumaneye,acat’s(32)havemorerodsthancones,(33)helpsthecatseeinthedark.Catsalsohaveellipticalp
Between1852,when【C1】______wasfirstestablishedthatMountEverestwasthehighestmountainonearth,and1953,whenEdmundHi
随机试题
行政机关在作出行政处罚决定之前,应当告知当事人作出行政处罚决定的事实、理由及依据,并告知当事人依法享有的权利。
小叶性肺炎的病变特点是
艾滋病的传播途径不包括
急性细菌性痢疾的临床表现,不典型的是
为了解决计算机CPU处理速度快,外设速度慢的矛盾,计算机采用了()技术。
教育费附加以( )为税基。
北京××商贸有限公司(1101210078)委托辽宁×××进出口公司(2101910061)与韩国签约,为河北××钢铁有限公司(1312931542)进口B50-71A型电动叉车。货物运抵进境后,由大连××货运代理公司(2102981013)向进境地海关申
战略咨询委员会是由中国移动通信集团公司邀请()、国内外知名经济法律学者、电信业知名人士和电信技术专家组成。
某单位需要派出下乡扶贫人员1至2人。经过宣传号召,众人纷纷报名。经过一番考虑,领导最后将扶贫人选集中在小王和小张两人身上。大家对最终的挑选结果作了如下猜测:(1)小王会被挑选上;(2)如果小王被挑选上,那么小张就不会被挑选上;
语言处理程序用于将源程序转换成机器语言形式,语言处理程序将进行语法、语义等方面的检查工作。语言处理程序包括汇编程序、编译程序和______3种。
最新回复
(
0
)