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Suppose you are reading a book. Suppose you suddenly close your eyes, can you still see the book? "Of course not." you will say. But can you tell why? You would p1.say, "When I close my eyes, my eyesight cannot get out of my eyes to get to the book." Many others might give an explanation(解释) very much like the above. But this explanation is w2. .

You cannot see any object if light from that object doesn’t get i3.your eyes. Some of the things you see give off light of their own.

The sun, the star, a lighted lamp are examples that can be seen by their own light. Such things are luminous(发光的). Most of the things you see are not g4.off light of their own. They are simply reflecting(反射) light that falls on them from the sun or some other luminous bodies. The moon, for example, doesn't give off any light of i5. own. It's non-luminous. You see it because sunlight falls on it and some of it reflects in your direction. So moonlight is only second-hand sunlight.

When you look at a book, it sends to your eyes some of the light which falls on it, and you see the book. If light could be kept out from w6.you are, so that there would be no light for the book to reflect, then you could not see the book e 7.with your eyes wide open.

Light travels so fast that the time it t8.from the book to your eyes is so short as if there was none at all. Light r 9.us from the moon, which is about 380,000 kilometers away, in only a little more than a s10..

1.probably 2.wrong 3.into 4.giving 5.its 6.where 7.even / easily 8.takes / travels 9.reaches 10.second 【解析】本文主要谈论我们为什么看见东西，主要物体的光线进入你的眼睛，如果物体的光线不进入你的眼睛，你就看不到任何物体。你看到的一些东西...

Answer 1