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.
1.You can see the book because___________.
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A．your eyes are close to it . |
B．it reflects light |
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C．it has light of its own |
D．your eyes can get to it |
2.The word “ reflects” means____________.
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A．throws back |
B．takes back |
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C．gives off |
D．sends out |
3. ___________ have light of their won.
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A．the sun and the moon |
B．The stars and the earth |
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C．The sun and the stars |
D．The moon and the earth |
完形填空(共20小题,每小题1.5分, 满分30分)
I’ll never forget May 12, 2008, we were having classes at Beichuan Middle School , Sichuan Province, when a huge 36 hit the area.
At about 2:28 p.m, our 37 , Mr.Wang, was teaching us singing on the fourth floor on the teaching building. 38 we felt the building shaking violently. It was an earthquake! Our building starting to 39 . It was too late to rush out to the 40 . We were told to hide under the desks. 41 later, the whole building fell down. We were 42 in ruins. We couldn’t move at all. No one could really imagine at that split second, how much pain we had 43 or how desperate(绝望的) we felt as we waited to be 44 . I heard Mr. Wang calling our names again and again… .
Hours later, some people came to rescue and 45 of us were saved.
Later, I 46 this huge earthquake scaled 8.0 magnitude. It hit several provinces, including Sichuan, Gansu and Shanxi. So far it has 47 more than 80,000 and injured 360,000. My hometown ----Beichuan was 48 the worst-hit areas. Our school , which was 49 filled with vigor(活力) and laughter, was a dead valley.
Words after such a 50 could appear nothing but empty and pointless. So many people’s lives were taken away, so much 51 was done and the whole city was 52 . Beichuan has become a history.
Now , some of my classmates and I were 53 to study in a middle school in Jiangsu Province. I still 54 dreaming and still strive for a better future: to make our homes beautiful yet 55 .
May victims rest in peace. May survivors live to be stronger.
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--- Are you pleased with what he has done?
--- Not in the least. It couldn’t be ___________.
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A．so bad |
B．much better |
C．any worse |
D．the best |
_____________, Mother will wait for him to have dinner together.
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A．However late is Father |
B．However Father is late |
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C．However is Father late |
D．However late Father is |
--- Would you like me to show you the way?
--- ____________.
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A．That’s very kind of you |
B．Yes, you could |
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C．Good idea ! |
D．With great pleasure. |
Listen! His family must be quarrelling, ___________ ?
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A．mustn’t it |
B．isn’t it |
C．aren’t they |
D．needn’t they |
