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You cannot 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 ssen 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. Then 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 your direction. So moonlight is only secondhand sunlight.
When you look at a book, it sends your eyes some of the light that 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 it took no time at all. Light reaches us form the moon , which is about 380,000 kilometers away, in only a little more than a second.
You can see the book because___________.
A. your eyes are close to it . B. it reflects light
C. it has light of its own D. your eyes can get to it
The word “ reflects” means____________.
A. throws back B. takes back
C. gives off D. sends out
___________ have light of their won.
A. the sun and the moon B. The stars and the earth
C. The sun and the stars D. The moon and the earth
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阅读下面短文, 掌握其大意, 然后从1￣20各题所给的四个选项中, 选出一 个最佳答案。
Suppose you are reading a book. Suppose, too, you suddenly 1 your eyes. Can you 2 see the book? "Of course not," you will say. But can you tell why? You would probably say, "When I close my eyes, my eyesight cannot 3 my eyes to get to the book." But this explanation is 4.
You cannot see any object 5 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 6 their own light. Such things are luminous (发光的). Most of the 7 you see are not giving off light of their own. They are 8 reflecting (反射的) light that falls on them from the sun or some other luminous body. The moon, for example, does not give off any light of 9 own. It is non-luminous. You see it because sunlight falls on it and some of it reflects 10 your direction. So moon light is 11 second-hand sunlight.
When you 12 a book, it sends to your eyes some of the light which falls on it, and you see the book. If light 13 out from where you are so that there 14 no light for the book 15, then you could not see the book even with your eyes wide open.
Light travels so fast that the time 16 it travels from the book you are reading to your eyes is so short 17 there were no 18 at all. Light 19 us from the moon, which is about 380,000 kilometers away, 20 only a little more than a second.
(1)A. shut to B. open C. close D. close to ［ ］ (2)A. yet B. even C. already D. still ［ ］ (3)A. get out B. get into C. get through to D. get out of ［ ］ (4)A. misunderstand B. no fact C. mistake D. wrong ［ ］ (5)A. when B. if C. unless D. as ［ ］ (6)A. at B. by C. in D. of ［ ］ (7)A. things B. object C. body D. matter ［ ］ (8)A. simply B. difficultly C. differently D. probably ［ ］ (9)A. it B. its C. it's D. his ［ ］ (10)A. in B. at C. on D. with ［ ］ (11)A. simple B. only C. certain D. like ［ ］ (12)A. see B. look C. look at D. watch ［ ］ (13)A. could be kept B. could keep C. will be kept D. will keep ［ ］ (14)A. would B. would be C. will be D. should be ［ ］ (15)A. to reflect B. reflect C. reflecting D. reflected ［ ］ (16)A. on which B. which C. in which D. in that ［ ］ (17)A. as B. like C. if D. as if ［ ］ (18)A. distance B. time C. place D. room ［ ］ (19)A. reaches at B. reaches to C. reaches D. gets through to ［ ］ (20)A. as B. during C. on D. in ［ ］
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| When I was a boy, every holiday that I had seemed wonderful. My 1 took me by train or by car to a hotel by the 2 . All day, I seem to remember, I 3 on the sands with strange 4 children. We made houses and gardens, and 5 the tide destroy them. When the tide went out, we 6 over the rocks and looked down at the fish in the rockpools. In those days the 7 seemed to shine always brightly 8 the water was always warm. Sometimes we left beach and walked in the country, 9 ruined houses and dark woods and climbing trees. There were 10 in one's pockets or good places where one could 11 ice-creams. Each day seemed a lifetime. Although I am now thirty-five years old, my idea of a good 12 is much the same as it was, I 13 like the sun and warm sand and the sound of 14 beating the rocks. I no longer wish to 15 any sand house or sand garden, and I dislike sweets. 16 , I love the sea and often feel sand running through my fingers. Sometimes I 17 what my ideal (理想中的) holiday will be like when I am 18 . All I want to do then, perhaps, will be to lie in bed, reading books about 19 who make houses and gardens with sands, who watch the incoming tide, who make themselves 20 on too many ice-creams.... | |||
| ( )1. A. teacher ( )2. A. sea ( )3. A. played ( )4. A. moving ( )5. A. made ( )6. A. rolled ( )7. A. light ( )8. A. and ( )9. A. exploring ( )10. A. sweets ( )11. A. make ( )12. A. house ( )13. A. hardly ( )14. A. waves ( )15. A. destroy ( )16. A.But ( )17. A. wonder ( )18. A. strong ( )19. A. children ( )20. A. happy |
B. parents B. lake B. slept B. excited B. brought B. jumped B. sun B. yet B. examining B. sand B. sell B. holiday B. almost B. tides B. fix B. However B. feel B. weak B. boy B. tired |
C. nurse C. mountain C. sat C. anxious C. watched C. turned C. moon C. but C. repairing C. ice-creams C. buy C. garden C. still C. hands C. use C. Otherwise C. understand C. young C. girls C. sad |
D. younger sister D. river D. stood D. nervous D. heard D. climbed D. lamp D. or D. measuring D. money D. offer D. tide D.perhaps D. feet D. build D. Besides D. believe D. old D. grown-ups D. sick |
| 完型填空。 | ||||
| When I was a boy, every holiday that I had seemed wonderful. My 1 took me by train or by car to a hotel by the 2 . All day, I seem to remember, I 3 on the sands with strange 4 children. We made houses and gardens, and 5 the tide destroy them. When the tide went out, we 6 over the rocks and looked down at the fish in the rock-pools. In those days the 7 seemed to shine always brightly 8 the water was always warm. Sometimes we 9 beach and walked in the country, exploring (搜寻) ruined houses and dark woods and climbing trees. There were 10 in one's pockets or good places where one could 11 ice creams. Each day seemed a life-time. Although I am now thirty-five years old, my idea of a good 12 is much the same as it was. I 13 like the sun and warm sand and the sound of 14 beating the rocks. I no longer wish to 15 any sand house or sand garden, and I dislike sweets. 16 , I love the sea and often feel sand running through my fingers. Sometimes I 18 what my ideal (理想的) holiday will be like when I am 19 . All I want to do then, perhaps, will be to lie in bed, reading books about 54 who make houses and gardens with sands, who watch the incoming tide, who make themselves 20 on too many ices creams. | ||||
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