河北省定州中学2017届高三下学期英语周练试题（4.9）

百强校河北定州中学2016-2017学年第二学期高三英语周练试题（4.9） 一、阅读理解 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 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 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 but not color. Some insects have favorite colors. Mosquitoes like blue but do not like yellow. A red light wil