缺詞填空 先通讀下列短文,掌握其大意,然后根據(jù)短文內(nèi)容和所給首字母,在空格內(nèi)填入一個適當(dāng)?shù)脑~,使短文意思完整。所填單詞在題后橫線上必須完整寫出(本大題共6分,每格0.5分)
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 p
__小題1: say, "When I close my eyes, my e
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___ cannot get out of my eyes to get to the book." Many others might give an explanation(解釋) very much like the above . But this explanation is w
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___.
You cannot see any object if light from that object doesn’t get into 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.
S
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__ things are luminous(發(fā)光的). Most of the things you see are not giving 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 i
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_ own. It's non-luminous. You see it because sunlight falls on it and some of it reflects in your d
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__. 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 w
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__ you are, so that there would be no light for the book to reflect, then you could not see the book e
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__ with your eyes wide open.
Light travels so fast that the time it t
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__ from the book to your eyes is so s
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_ as if there was none at all. Light r
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__ us from the moon, which is about 380,000 kilometers away, in only a little more than a s
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__.