About ten men in every hundred have the trouble of colorblindness in some way. Women are luckier, only about five in every hundred are affected in this matter. Perhaps, after all, it is safer to be driven by a woman.

There are different shapes of color blindness. For example, a man may be able to see deep red. He may think that red, orange and yellow are all shades of green. Sometimes a person can not tell the difference between blue and green. Only a few unlucky men may see everything in shades of green-a strange world indeed.

Colour blindness in human beings is a strange thing to say clearly. In only one eye there are millions of very small things called “cones^①”. These help us to see in a bright light and to tell difference between colours. There are also millions of “rods^②”，but these are used for seeing when it is nearly dark. They show us shapes but no colours. Some insects have favourite colours. Mosquitoes^③ like blue but do not like yellow. A red light will not attract insects, but a blue light will. Human beings also have favourite colours. Yet we are lucky. With the help of the cones in our eyes we can see many beautiful colours by day, and with the help of the rods we can see shapes at night. One day we may even learn more about the invisible^④ colours around us.

生词注释：①cone n.锥形物　②rods n.棒　③mosquitoe n.蚊子　

　　　　　④invisible adj.看不见的

1.“colour blindness”means       in Chinese.

       A.色盲                        B.颜料                    C.盲目                   D.瞎

2.Why do some people say it is safer to be driven by women?

       A.Women are better at driving than men.

       B.Women are more careful.

       C.There are fewer colour blind women.

       D.Women are friendly to people.

3.With the help of the “cones”, we can      .

       A.tell different shapes   B.kill insects

       C.see in a weak light     D.tell orange from yellow

4.We can attract and kill mosquitoes by using a       light.

       A.red                          B.yellow                 C.blue                    D.green

5.Which of the following sentences about the colour blindness is TRUE?

       A.None of them can see deep red.

       B.Not all of them have the same problem in recognizing(识别)colour.

       C.None of them can tell the difference between blue and green.

       D.All of them see everything in shades of green.

完形填空

Big schoolbags have been a serious problem for students for a long time.Maybe your schoolbag is too 　1　 to carry，and it troubles you a lot 　2　 you want to find a book out to read，Now an e-textbook will 　3　 you.

It is said that e-textbooks are going to be 　4　 in Chinese middle schools.An e-textbook，in fact，is a small 　5　 for students.It is much 　6　 than a usual schoolbag and easy to carry.Though it is as small as a book，it can 　7 　 all the materials（材料）for study.The students can read the text page by page on the 　8　，take notes with the pointer（屏写笔）.Or even “　9　” their homework to their teachers by sending e-mails.All they have to do is to press a button.　　

Some people say e-textbooks are good，but some say they may be 　10 　 for the students’ eyes.What do you think of it?