About ten men in every hundred suffer from color blindness i

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 matter,Perhaps,after all,it is safer to be driven by a woman!
There are different forms of color blindness.In some cases a man may not be able to see deep red.He
may think that red,orange and yellow are all shadows 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.
Color blindness in human beings is a strange thing to explain.In a single eye there are millions of very small
things called "cones" (圆锥细胞).These help us to see in a bright light and to tell the difference between colors.
There are also millions of "rods" (棒条体),but these are used for seeing when it is near dark.They show us
shape but no color.
Some insects have favorite colors.Mosquitoes (蚊子) prefer blue to yellow.A red light will not attract
insects,but a blue lamp will.In a similar way human beings also have favorite colors.Yet we are lucky.With
the aid of the cones in our eyes we tan see many beautiful colors by day,and with the aid of the rods we can
see shapes at night.One day we may even learn more about the invisible (看不见的) colors around us.
1.The passage is mainly about _____.
A.color and its surprising effects
B.women being luckier than men
C.danger caused by color blindness
D.color blindness
2.According to the passage,