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
When we can see well, we don’t think about our eyes very’ often. It is only when we cannot see perfectly that we come to see how
When we can see well, we don’t think about our eyes very’ often. It is only when we cannot see perfectly that we come to see how
admin
2009-08-15
58
问题
When we can see well, we don’t think about our eyes very’ often. It is only when we cannot see perfectly that we come to see how important our eyes ale.
People who are nearsighted can only see things that are very close to their eyes. Many people who do a lot of close work, such as writing, reading and sewing, become nearsighted. Then they have to wear glasses in order to see distant things clearly.
People who are farsighted suffer from just the opposite problem. They can see things that are far away, but they have difficulty reading a book unless they hold it at arm’s length. If they want to do much reading, they must get glasses too.
Other people don’t see clearly because their eyes are not exactly the right shape. This, too, can be corrected by glasses. Some people’s eyes become cloudy because of cataracts (白内障). Long age these people often became blind. Now, however, it is possible to operate on the cataracts and remove them.
When night falls, colors become fainter (更暗淡的) to the eye and finally disappear. After your eyes have grown used to the dark, you can see better if you use the sides of your eyes rather than the center. Sometimes, after dark, you see a small thing to one side of you, which seems to disappear if you turn your head to its direction. This is because when you turn your head, you are looking at the thing too directly. Men on guard duty sometimes think they see something moving to one side of them. When they turn to look straight at it, they cannot see it any more, and they believe they were mistaken. However, this mistake happens because the center of the eye, which is very sensitive (敏感的) in daylight, is not as sensitive as the sides of the eye after dark.
选项
A、we are sick
B、we can’t see clearly
C、we wear glasses
D、we burst into tears
答案
B
解析
从文章第一段It is only when we cannot see perfectly that we come to see how important our eyes are.可以看出答案。
转载请注明原文地址:https://kaotiyun.com/show/Weyd777K
本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
0
公共英语二级笔试
公共英语(PETS)
相关试题推荐
Mr.Longwasonlythirtybutdrankforthirteenyears.Hespentmuchtimeintherestaurantsandoftendrunkalotthere.Hehad
______,thisbookwillselllikenotcakes.
WhydideverybodyinthevillagethinkMarkwoulddie?
Whatarethereinthebriefcase?
KeepUpwiththeJonesesIntheUnitedStates,whenonebecomesrich,hewantspeopletoknowit.Andevenifhedoesnotbe
Accordingtotheauthor,babieslearntodothingswhich______.InPapousek’sexperimentbabiesmakelearnedmovementsofthe
Onedaytheycrossedthe______bridgebehindthepalace.
IarrivedintheUnitedStatesonFebruary6,2005,butIremembermyflintdaythereveryclearly.Myplane【B1】atKennedyAirp
Readingisawayofenjoyment,relaxation,restorfreedomfromworry.Thesecanbefeltbythereadersfromtheactualreading
Whatwasthematterwithyouthismorning?Youlooked______youhadn’tsleptforthelasttwenty-fourhours.
随机试题
腰骶部脊膜膨出枕部脑膜膨出
妊娠晚期无痛性反复阴道流血高血压、水肿、蛋白尿
方法发明专利人享有下列哪些权利()
1.背景某民航机场,飞行区指标为4E,近期机场当局拟对站坪和目视助航设施进行改扩建,并新增航管设备。建设单位对立项工程计划造价为:站坪工程20000万元,航管安装工程2000万元,目视助航工程1600万元。建设单位拟通过招标选择三项工程专业施工单位。在投
以下哪项不是单位内部会计控制的重点内容?()
融资租赁房屋在租赁期内房产税的纳税人是( )。
确定测量仪器的计量特性,并签发关于其法定地位的官方文件,称为_________。
设函数u=u(x,y)满足及u(x,2x)=x,u’1(x,2x)=x2,u有二阶连续偏导数,则u’’(x,2x)=().
Mr.Blackwasyoungandable.Thebosslikedhim.LastmonthhewassenttoChinaonbusiness.BeforehewentbackfromChina,h
在云南省西北部的玉龙雪山脚下坐落着人间仙境般的丽江古城。古城里聚居的居民以纳西族为主,是我国唯一的纳西族自治区。人们惊讶于这里“天人合一”的古朴意识及其博大精深的文化内涵,赞叹西南边陲的少数民族先人们在丽江这片奇丽的土地上筑起了一座没有城墙的古城。古城里的
最新回复
(
0
)