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
56
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
with
解析
转载请注明原文地址:https://kaotiyun.com/show/47Td777K
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
Youshouldhaveblendedthebutterwiththesugarthoroughly.
Theconferenceexploredthepossibilityofclosertradelinks.
InterpretingthenewsThenewspapermustprovideforthereaderthefacts,unalloyed(纯粹的),unslanted(不偏不倚的),objectivelyselec
TheDifferencebetweenManandComputerWhatmakespeopledifferentfromcomputerprograms?Whatisthemissingelementthat
(31)withthehumaneye,acat’s(32)havemorerodsthancones,(33)helpsthecatseeinthedark.Catsalsohaveellipticalp
ChrisBoningtonhasclimbedMountEverestatleasttwicesofar.
ChrisBoningtonhasclimbedMountEverestatleasttwicesofar.
Between1852,when【C1】______wasfirstestablishedthatMountEverestwasthehighestmountainonearth,and1953,whenEdmundHi
Between1852,when【C1】______wasfirstestablishedthatMountEverestwasthehighestmountainonearth,and1953,whenEdmundHi
随机试题
病毒性肝炎病变中,属于渗出病变的是
限定放大摄影的放大倍数,取决于
患者突然昏倒,口噤不开,面青身凉,苔白,脉迟有力。当首选的药物是
A.天竺黄B.竹茹C.淡竹叶D.前胡E.白前具有清心利尿功效的是
具有吗啡受体纯拮抗作用的镇痛药具有吗啡受体部分激动作用的镇痛药是
根据《合同法》的规定,下列要约中,不得撤销的有()。
由于蚕丝特有的化学特性使绣品难以在四川潮润的气候下长期保存,所以在四川地区考古发现的绣品极少,无法以考古的方法来追溯蜀绣的起源。但是,蜀绣仍以其他形式留下了吉光片羽。1986年,在成都三星堆遗址出土了一件距今约4800年的青铜立人像,该铜人身穿龙纹礼衣,
9,9,16,36,(),169
A、Atthepeakinhistory.B、Morethantheaverageofthepasttenseasons.C、Morethantheamountofthisseason.D、Lessthanth
Youmightthinkalittleglobalwarmingisgoodforfarming.Longer,warmergrowingseasonsandmorecarbondioxide(CO2)—whatpl
最新回复
(
0
)