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.

25. You can see the book because__________.

A. your eyes are close to it　　　　　　　　　　　　　　　 B. your eyesight can get to it

C. it has light of its own　　　　　　　　　　　　　　　　　 D. it reflects some of the sunlight

26. The underlined word “l(fā)uminous” means__________.

A. visible（可見的）　 B. all colors　　　　　　　 C. giving off light　　　　 D. sunlight

27. 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. Light travels so fast that there is no time for you to read.

D. The moment you open your eyes the light from the book travels to your eyes.

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