Never ________ been to the Great Wall.

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完形填空

　　What actually happens when we read? Some people think that we read one word 1 , understand it and then go on to the next. Other people think that our eyes smoothly 2 over each line from left to right, then back to the beginning of the 3 line, and so on. In fact, the physical action of reading usually doesn't working 4 of the way.

　　 5 you do this experiment with a friend. Get hold of a book with a large page 6 and with lines that go right 7 the page. 8 your friend to 9 the book up and to read it with the top of the book just 10 his eyes level. This 11 that you can watch the movement of his eyes as he reads the page. 12 you do this, you will see that your friends' eyes don't make a continuous forward sweep. 13 they progress by little “jumps”, moving, then stopping, as they progress along the line.

　　 14 to be this starting and stopping movement 15 the eyes can see only when it is not moving. Every time the eye 16 it sees a phrase or even a sentence, then jumps to the next part of the line and so on.

　　There is another interesting fact about eye movement. You will notice that 17 , the reading goes back and looks again at something he has read 18 , in other words, he returns to an earlier part of the text probably because he 19 he is not understanding it properly. Then he comes back to 20 he stopped and continues reading.

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