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¡ªDo you know sound travels very fast?

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C. much faster than D. slower than

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I want   it today.

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1.Our books are all over the place. 2.Neil's mother is calling him from the UK. 3.Where is Tom¡¯s key ring? 4.There are a lot of after-school activities in their school. 5.His book is next ...

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¡ªCould you please tell me ?

¡ªYes. There is one on Center Street.

A. when was the telephone invented

B. when you will take your vacation

C. where can I buy some stamps

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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 p1.say, "When I close my eyes, my eyesight cannot get out of my eyes to get to the book." Many others might give an explanation(½âÊÍ) very much like the above. But this explanation is w2. .

You cannot see any object if light from that object doesn¡¯t get i3.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. Such things are luminous(·¢¹âµÄ). Most of the things you see are not g4.off light of their own. They are simply reflecting(·´Éä) light that falls on them from the sun or some other luminous bodies. The moon, for example, doesn't give off any light of i5. own. It's non-luminous. You see it because sunlight falls on it and some of it reflects in your direction. 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 w6.you are, so that there would be no light for the book to reflect, then you could not see the book e 7.with your eyes wide open.

Light travels so fast that the time it t8.from the book to your eyes is so short as if there was none at all. Light r 9.us from the moon, which is about 380,000 kilometers away, in only a little more than a s10..

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The Summer Palace __________ a hill and a man-made lake.

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________ comes after September and before November in a year.

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C. March D. October

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I hear the tall girl wearing glasses is your new classmate. She¡¯s from America, _____ ?

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