There are different kinds 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 shades of green. Sometimes a person can’t 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 (圆锥体)”. These help us to see in the bright light and to tell differences between colors. There are also millions of “rods (柱状体)”, but these are used for seeing when it is nearly dark. They show us shapes but not colors.

　　Some insects have favorite colors. Mosquitoes (蚊子) like blue but do not like yellow. A red light will not attract insects, but a blue light will. Human beings also have favorite colors. Yet we are lucky. With the help of the cones in our eyes, we can see many beautiful colors by day, and with the help of the rods we can see shapes at night.

　　64. This passage is mainly about ___________.

　　A. colour and its surprising

　　B. women being luckier than men

　　C. danger caused by colour blindness

　　D. colour blindness

　　65. According to the passage, with the help of the “cones”, we can ___________.

　　A. tell different shapes

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