About ten men in every hundred suffer from color blindness in some way. Women are luckier, only about one in two hundred if 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 shades of green. Sometimes a person can’t tell the differences between blue and green. In rare cases an unlucky man sees everything in shades of green--- a strange world in deed.
Color blindness in human beings is a strange thing to explain. In a single eye there are millions very small things called “cones”. These help us see in a bright day and tell the differences between colors. There are also millions of “rods”, but these are used for seeing when it is nearly dark. They show us shapes(形状) but not color. 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. In similar way human being also have favorite colors. Yet we are lucky. With the aid of cones in our eyes we can 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 colors around us.
小题1:The passage is mainly about ______.

A．color and its surprising effects on drivers

B．women being luckier than man in that fewer of them are color blind

C．danger caused by color blindness

D．color blindness and how our eyes tell different colors and shapes

小题2:According to the passage, with the help of “cones” we can _____.

A．tell different colors	B．see in weak light
C．tell different shapes	D．tell orange from yellow

小题3:Why do some people say it is safer to be driven by women?

A．Women are more careful.

B．There are fewer color blind women.

C．Women are fonder of driving than men.

D．Women are weaker but quicker in thinking.

小题4:Which of the following statements about color blind people is true?

A．Not all of them have the same problem in recognizing colors.

B．None of them can see deep red but all can tell blue from green.

C．None of them can tell blue from green but all can see deep red.

D．All of them are lucky enough to see everything in shades of green.