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
22
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
to
解析
转载请注明原文地址:https://jikaoti.com/ti/uFxsFFFM
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
WhichofthefollowingstatementswouldBowlbysupport?Itissuggestedthatmodemsocietiesdifferfromtraditionalsocieties
InterpretingthenewsThenewspapermustprovideforthereaderthefacts,unalloyed(纯粹的),unslanted(不偏不倚的),objectivelyselec
NewIdeasIceland’sPresidentOlafurGrimssonistryingtodrivecarbondioxide(二氧化碳)undergroundto
Maryevidentlyisthemost(diligent)studentamongus.
(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
ChrisBoningtonhasclimbedMountEverestatleasttwicesofar.
Between1852,when【C1】______wasfirstestablishedthatMountEverestwasthehighestmountainonearth,and1953,whenEdmundHi
随机试题
X线片上显示为包绕牙根的、连续不断的高密度线条状影像在牙体X线片上影像密度最高的是
关于医德教育意义的叙述,不正确的为()
对罪犯在服刑期间发现漏罪及犯新罪的管辖错误的是:()
下列选项中说法错误的是()。
会计法律制度侧重于调整会计人员的()和结果的合法性。
基准比较法在实际应用中存在的问题有( )。
外国企业在中国境内未设立机构、场所,而有取得的来源于中国境内的利润、利息、租金、特许权使用费和其他所得,或虽设立机构、场所,但上述所得与其机构、场所没有实际联系的,自2000年1月1日起,减按()的税率征收预提所得税。
【2010江西真题】课程标准是()的基本纲领性文件。
下面对对象概念描述正确的是
Theplanecrashed,itsbombs()asithittheground.
最新回复
(
0
)