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
35
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] What might be the reason that a blue lamp will attract insects but a red light won’t according to the passage?
选项
答案
Some insects’ favorite color is blue.
解析
由题干关键词blue lamp和red light可定位原文最后一段,倒数第三句话说Some insects have favorite colors,可以直接得出答案。
转载请注明原文地址:http://tihaiku.com/zcyy/3001984.html
相关试题推荐
[originaltext]WhenIraqitroopsblewuphundredsofKuwaitioilwellsatth
[originaltext]Workinglonghourscangreatlyincreasetheriskofsuffering
[originaltext]Aboutahundredyearsago,thepeopleofLondonwereamazedt
[originaltext]Aboutahundredyearsago,thepeopleofLondonwereamazedt
[originaltext]Manypeoplesufferfromsomeformofextremeanxiety.Someex
[originaltext]Manypeoplesufferfromsomeformofextremeanxiety.Someex
HealthCareandEpidemicsEveryonesuffersfromdiseasea
HealthCareandEpidemicsEveryonesuffersfromdiseasea
HealthCareandEpidemicsEveryonesuffersfromdiseasea
HealthCareandEpidemicsEveryonesuffersfromdiseasea
随机试题
占accountfor
Accordingtoresearch,therearesituatio
试述研究学生的气质类型的意义。
关于常用土方施工机械的经济运距,下列说法错误的是()。A.履带式推土机的推运距离
风痰上扰证。眩晕,头痛,胸膈痞闷,恶心呕吐,舌苔白腻,脉弦滑,宜选用的方剂是A.
隔离的目的是A.控制传染源B.切断传播途径C.保护易感人群D.防止病原体扩散E.
A.交叉感染 B.自身感染 C.医源性感染 D.二重感染 E.呼吸道感染
育龄期女性月经周期子宫内膜变化规律是()。A.月经期-增生期-分泌期 B
发行人和保荐人报送发行申请文件,初次应提交()。A:原件一份,复印件两份B:原
某建设工程项目,监理合同履行过程中发生如下事件: 事件1:总监理工程师对部分监
最新回复
(
0
)