小伙伴们，公共英语考试大家复习的怎么样了呢？下面是帮考网分享一些公共英语考试三级部分的复习资料，一起来看看吧！

公共英语三级模拟试题B5-1：

Congenital color vision disorder is usually called color blindness,which can not distinguish various colors or certain colors in the natural spectrum;and those with poor ability to distinguish colors are called weak colors.Although people with weak color perception can see the colors seen by normal people,their ability to identify colors is slow or very poor.When the light is dark,some of them are almost similar to color blindness or show color fatigue,which is similar to color blindness In general,it is not easy to strictly distinguish the boundaries.Congenital factors are common in color blindness and color weakness.About ten men in every hundred suffer from colour blindness in some way;women are luckier only about one in two hundred is affected in this manner．There are different forms of colour 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．Wait until it is dark tonight then 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 ultraviolet rays which are invisible to us and some of them can even see X-rays．The wings of a moth may seem grey 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．

1、Among people who suffer from color blindness ________．

A．some may see everything in shades of green

B．few can tell the difference between blue and green

C．few may think that red orange and yellow are all shades of green

D．very few may think that everything in the world is in green

答案：D

解析：在第二段最后一句中作者说在罕见的病例中，不幸的患者会把每一种色彩都当作是深浅不同的绿色。ABC的错误之处都在于对色盲人数多少的限定词some或few不够准确。

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