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
59
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
than
解析
转载请注明原文地址:https://kaotiyun.com/show/v7Td777K
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
hespokeinatemperatemanner,notfavouringeithersideespecially.
UniversityPhysicsUniversityPhysicsisintendedforstudentsofscienceandengineering.Primaryemphasisisonphysicalprinc
NewIdeasIceland’sPresidentOlafurGrimssonistryingtodrivecarbondioxide(二氧化碳)undergroundto
ImproveComputer-researchSkillsLikemanycollegestudents,JoseJuarezcarriesaroundapocket-sizedcomputerthatletshi
(31)withthehumaneye,acat’s(32)havemorerodsthancones,(33)helpsthecatseeinthedark.Catsalsohaveellipticalp
(31)withthehumaneye,acat’s(32)havemorerodsthancones,(33)helpsthecatseeinthedark.Catsalsohaveellipticalp
ChrisBoningtonhasclimbedMountEverestatleasttwicesofar.
ChrisBoningtonhasclimbedMountEverestatleasttwicesofar.
Between1852,when【C1】______wasfirstestablishedthatMountEverestwasthehighestmountainonearth,and1953,whenEdmundHi
随机试题
A.影响药物吸收B.影响药物分布C.影响药物代谢D.增加药物排泄E.减少药物排泄麻仁丸与士的宁联用,能
试验检测机构换证复核是指试验检测等级证书有效期满,根据试验检测机构申请,由原发证机构对其()的核查。
将0.400mol/L的NH3.H2O与0.200mol/LHCl等体积混合,在混合后的溶液中加入少量强酸,则溶液的pH将()。
根据《常用化学危险品贮存通风》原则,危险化学品储存方式中不包括的是()。
套利证券组合是预期收益增加而风险没有增加,因而套利证券组合要满足三个条件。以下关于满足的条件,说法正确的是()
识别和认定银行各类资产风险含量的基本标准是()。
【2015辽宁鞍山】老谋深算属于()。
在()周边距离十米至三百米内,不得举行集会、游行、示威,经国务院或者省、自治区、直辖市的人民政府批准的除外。①国务院的所在地②重要军事设施③最高人民检察院的所在地④航空港⑤火车站
A.sendingB.aswellasC.beyondPhrases:A.【T1】______thereachofmostAmericansB.【T2】______youngpeopletocolleg
告缗(2009年历史学统考真题)
最新回复
(
0
)