Unit 7 The Sea
第Ⅰ卷
第一部分 听力(略)
第二部分 阅读理解(共两节，满分40分)
第一节(共15小题；每小题2分，满分30分)
阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。
A
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 difference between
