When night falls, colors become fainter to the eyes and finally disappear. After your eyes have grown used to the dark, you can see better if you use the side of your eyes rather than the centers. Sometimes, after dark, you see a small thing to one side of you, which seems to disappear if you turn your head in its direction. This is because when you turn your head, you are looking? at the thing too directly. Men on guard duty sometimes think they see something moving to one side of them. When they turn to look straight at it, they can not see it any more, and they believe they were mistaken. However, this mistake happens because the center of the eye, which is very sensitive in daylight, is not as sensitive as the sides of the eye after dark.
59.We dont know that our eyes are of great importance until ________.
A. we think about our eyes B. we cannot see clearly
C. we wear glasses D. we have to do much reading
60.According to the passage, a ________ is more likely to be nearsighted.
A.tailor B. doctor C. guard D.painter
61.People who are farsighted ________ .
A.cannot do a lot of close work without glasses
B.can only see things that are very close to their eyes
C.have difficulty reading a book if they hold it at arms length
D.have the same problem as the nearsighted people
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2016-02-29
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