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
34
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:https://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
Slovenlyspeechcomesoffthesamespool.Vocabulary,likebluejeans,isb
Theexperience______inthewarwillbeofgreatvaluetous.A、togainB、gainin
Forthispart,youareallowed30minutestowriteashortessayentitledMyVie
一般认为肌力水平达到峰值的年龄为A.10~20岁 B.20~30岁 C.30
下列关于可摘局部义齿支持形式的叙述,错误的是()A.牙支持式义齿的力
患者,女,31岁,发热,全身酸痛,轻度黄疸半个多月,伴有酱油色尿。实验室检查:H
把下面的六个图形分为两类,使每一类图形都有各自的共同特征或规律,分类正确的一项是
D第一步,本题考查非整数数列中的分数数列。 第二步,由于反约分后无明显规律,分数做差,考虑做差。两两做差得到新数列:、(),分子不变,分母为公差为3的等差
简述培养幼儿好的饮食习惯包括哪些方面。
最新回复
(
0
)