首页
登录
职称英语
About ten men in every hundred suffer from color blindness in some way; wome
About ten men in every hundred suffer from color blindness in some way; wome
游客
2023-09-10
38
管理
问题
About ten men in every hundred suffer from color blindness in some way; women are luckier only about one in two hundred is affected in this manner. There are different forms of color blindness. A man may not be able to see deep red. He may think that red, orange and yellow are all shades of green. Sometimes a person cannot tell the difference between blue and green. In rare cases an unlucky man may see everything in shades of green—a strange world indeed.
In certain occupations color blindness can be dangerous and candidates are tested most carefully. For example, when fighting at night, soldiers use lights of flares to signal to each other. A green light may mean "Advance" and a red light may mean "Danger! Keep back!" You can see what will happen if somebody thinks that red is green! Color blindness in human beings is a strange thing to explain. In a single eye there are millions of very small things called "cones". These help to see in a bright light and to tell the difference between colors. There are also millions of "rods" but these are used for seeing when it is nearly dark. They show us shape but not color. Walt until it is dark tonight, arid than go outside. Look round you and try to see what colors you can recognize,
Birds and animals which hunt at night have eyes which contain few or no cones at all, so they cannot see colors. As far as we know, bats and adult owls cannot see colors at all only light and dark shapes. Similarly cats and dogs cannot see colors as well as we can.
Insects can see ultra-violet rays which are invisible to us, and some of them can even see X-rays. The wings of a moth may seem gray and dull to us, but to insects they may appear beautiful, showing colors which we cannot See. Scientists know that there are other colors around us which insects can see but which we cannot see. Some insects have favorite colors. Mosquitoes like blue, but do not like yellow. A red light will not attract insects but a blue lamp will. [br] According to the passage, color blindness can be dangerous in certain occupations like ______.
选项
答案
soldiers
解析
由题干关键词dangerous定位原文第二段,第二句所举的soldiers的例子显然就是为了证明主题句所说的对于某些职业来说色盲会造成危险。
转载请注明原文地址:http://tihaiku.com/zcyy/3001980.html
相关试题推荐
[originaltext]Workinglonghourscangreatlyincreasetheriskofsuffering
[originaltext]Aboutahundredyearsago,thepeopleofLondonwereamazedt
[originaltext]Aboutahundredyearsago,thepeopleofLondonwereamazedt
HealthCareandEpidemicsEveryonesuffersfromdiseasea
HealthCareandEpidemicsEveryonesuffersfromdiseasea
HealthCareandEpidemicsEveryonesuffersfromdiseasea
HealthCareandEpidemicsEveryonesuffersfromdiseasea
HealthCareandEpidemicsEveryonesuffersfromdiseasea
HealthCareandEpidemicsEveryonesuffersfromdiseasea
HealthCareandEpidemicsEveryonesuffersfromdiseasea
随机试题
Thedevelopmentofwritingwasoneofthegreathumaninventions.Itisdiff
Childrenaretheindividualswithinourculturesthatarethemost______tothed
A--judicialsystemB--InsuranceLawC--crimina
[originaltext]Startingabusinessisnevereasy.ButanorganizationlikeT
【B1】[br]【B4】A、countedB、agedC、seemedD、livedB惯用衔接题。Agefrom...to...意为“(一群人的年
异烟肼可使下述哪些药物的代谢减慢、作用增强()A.麻黄碱 B.恢压敏 C
提问者把重要人物、团体或自己的观点加在问话里,有暗示或诱导对方做出答案的问题属于
( ),教育部颁发了《幼儿园教育指导纲要(试行)》,这标志着我国幼儿教育改革进
沙盘推演测评的特点包括( )。A.能考察参与者的综合能力 B.能直观展现参与
采用垫层法加固厚度较大的软弱地基,其最主要的作用是()。 A.应力扩散,满足
最新回复
(
0
)