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What is the sky？ Where is it？ How bright is it？ What lies above it？ These questions are difficult to answer, aren’t they？
Is the sky blue？ The sky has no color. We know that there is air around the world. When planes fly, they need air to lift their wings. Planes can’t fly very high because the air gets thinner when they go up higher. If we go up about 1,200 kilometers from the earth, we’ll find no air there.
When we talk about the sky, we usually mean the atmosphere around the earth. It is like a very thick “cover” over the earth and keeps it warm. Without the “cover”, the earth would be a very cold place and nothing could live on it.
Looking up above us, you will see the blue sky with white clouds. It is usually light blue, but the sky would be dark blue if you go to the top of the highest mountains. And you will see fewer clouds between you and the sun.
And if you sit in a spaceship high above the earth, there is no air at all. The sky would be so dark that its color would be black.
Sometimes the sky doesn’t look blue. When the sun rises and falls, you will see red, orange, and other colors in the sky. These are the most beautiful moments of the day.
Now you may understand that we see colors because the air scatters (散射) the sunlight. Light travels through the air. Without air, there would be no light and no colors.
1.Planes can’t fly very high because ____________.
A．there is air around the world
B．the air gets thinner when they go up higher
C．it’s warmer in the sky
D．the air gets thicker when they go up higher
2.We can see colors of the sky because ____________.
A．the sun rises and falls every day
B．the sky has lots of colors
C．the air scatters the sunlight
D．the sunlight has many colors
3.Which of the following is TRUE？
A．There is little air without light and colors in the sky.
B．The sky will look red, orange and other colors at noon.
C．The sky ha
s
only one color when the sun rises and falls.
D．The sky is dark blue if you go to the top of the highest mountains.
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A poor girl was selling flowers in the street 21 Christmas Eve. Her parents were ill, so she 22 get money for food. It was very cold. The girl felt cold and hungry. She stopped 23 a beautiful house. The girl knocked 24 the door and a man came out. She asked 25 he needed some flowers. The man said he didn't want 26 . She left the house and felt tired. She sat down at the 27 of a tall wall. She looked 28 the flowers. 'Ihe flowers 29 very nice. She suddenly had an unusual feeling. She felt she became light, 30 slowly she began to fly into the sky. She 31 higher and higher and at last she found herself on the clouds. A group of people were coming to meet her. At the head of them 32 her granny. She welcomed her and asked her why she didn't 33 .The girl told her that she had to 34 to get money became her parents were badly ill. Granny told her 35 and gave her lots of beautiful clothes and delicious food. The girl laughed 36 .
It snowed 37 that night. The girl died 38 a smile on her face. 39 , people in the beautiful house began to sing Christmas songs and 40 .
21. A. in B. on C. at D.（不填）
22. A. could B. had better C. would like D. had to
23. A. in front of B. in the front of C. behind D. beside
24. A. at B. to C. in D. for
25. A. what B. why C. if D. when
26. A. some B. any C. nothing D. something
27. A. head B. foot C. top D. middle
28. A. for B. up C. (不填) D. at
29. A. feels B. felt C. smelt D. smells
30. A. and B. but C. so D. or
31. A. went B. got C. looked D. flew
32. A. has B. was C. had D. were
33. A. get money B. go out C. come to see her D. stay at home
34. A. fly into the sky B. come here C. sell flowers D. help others
35. A. didn't worry B. not to worry C. to not worry D. to worry not
36. A. happy B. happier C. happiest D. happily
37. A. heavily B. heavy C. largely D. strongly
38. A. had B. has C. with D. without
39. A. By the way B. At the same time C. except the girl D. By way
40. A. looked after the girl B. talked about the girl
C. enjoyed themselves D. watched themselves
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Is the sky blue？ The sky has no color. We know that there is air around the world. When planes fly, they need air to lift their wings. Planes can’t fly very high because the air gets thinner when they go up higher. If we go up about 1,200 kilometers from the earth, we’ll find no air there.
When we talk about the sky, we usually mean the atmosphere around the earth. It is like a very thick “cover” over the earth and keeps it warm. Without the “cover”, the earth would be a very cold place and nothing could live on it.
Looking up above us, you will see the blue sky with white clouds. It is usually light blue, but the sky would be dark blue if you go to the top of the highest mountains. And you will see fewer clouds between you and the sun.
And if you sit in a spaceship high above the earth, there is no air at all. The sky would be so dark that its color would be black.
Sometimes the sky doesn’t look blue. When the sun rises and falls, you will see red, orange, and other colors in the sky. These are the most beautiful moments of the day.
Now you may understand that we see colors because the air scatters (散射) the sunlight. Light travels through the air. Without air, there would be no light and no colors.
小题1:Planes can’t fly very high because ____________.
| A．there is air around the world |
| B．the air gets thinner when they go up higher |
| C．it’s warmer in the sky |
| D．the air gets thicker when they go up higher |
| A．the sun rises and falls every day |
| B．the sky has lots of colors |
| C．the air scatters the sunlight |
| D．the sunlight has many colors |
| A．There is little air without light and colors in the sky. |
| B．The sky will look red, orange and other colors at noon. |
| C．The sky has only one color when the sun rises and falls. |
| D．The sky is dark blue if you go to the top of the highest mountains. |