You can not see any object unless light from that object gets into your eyes. Some of the things you see give off light of their own. The sun, the stars, a lighted lamp are examples that can be seen by their own light. Such things are luminous. Most of the things you see are not giving off light of their own. They are simply reflecting light that falls on them from the sun or some other luminous bodies. The moon, for example, does not give off any light of its own. It is non-luminous. You see it because sunlight falls on it and some of it reflects in our direction. So moon light 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 where you are so that there would be no light for the book to reflect, then you could not see the book even with your eyes wide open.
Light travels so fast that the time in which it travels from the book you are reading to your eyes is so short as if there were no time at all. Light reaches us from the moon, which is about 380 000 kilometers away, in only a little more than a second.
【小題1】You can see the book because_______.

A．your eyes are close to it B．it reflects some of the sunlight
C．it has light of its ownD．your eyesight can get to it
【小題2】The underlined word “l(fā)uminous” means_______.
A．visibleB．a(chǎn)ll colorsC．giving off lightD．sunlight
【小題3】________ have light of their own.
A．The sun and the moonB．The stars and the earth
C．The sun and the starsD．The moon and the earth
【小題4】Which of the following is true?
A．All the things you can see give off light.
B．Light from the book is much shorter than that from the moon.
C．The moment you open your eyes the light from the book travels to your eyes.
D．Light travels so fast that there is no time for you to read.


【小題1】B
【小題1】C
【小題1】C
【小題1】C

解析【小題1】B 細(xì)節(jié)題;從文章的第一段的句子：You can not see any object unless light from that object gets into your eyes.說明是太陽光線反射到我們的眼鏡才能看見東西。
【小題1】C 前面提到的東西：The sun, the stars, a lighted lamp都是散發(fā)光線的。
【小題1】C解析同上題，這些東西都是有自己的光的。
【小題1】C 推理題：從最后一段的Light travels so fast that the time in which it travels from the book you are reading to your eyes is so short as if there were no time at all.說明光的速度很快，你一睜開眼，光線就到你眼中了。選C。

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