A 跨学科 物理
[2025 南通市启东市期中]We all know the skies are blue on sunny days. But do you notice the colour of the mountains? 1. In fact, all mountains look blue from a faraway place. It's really a magical thing. Do you know what's the reason for the blue skies and blue mountains?
2.
Sunshine is a mix of red, orange, yellow, green, blue, indigo and purple. The light in different colours has a different wavelength.
The atmosphere(大气层) is full of very small air molecules. When light meets them, it gets scattered around. 3. The blue light is about half the wavelength of the red light and it gets scattered much more easily than the red light.

4.
More distance(距离) from a mountain means more atmosphere. Finally, we only see the blue light. The mountain disappears into the sky. The same thing happens with tall buildings, too.
5.
A. So blue is the main colour of the atmosphere.
B. This interesting science is very useful in our life.
C. You can find the answer from the science of sunshine.
D. You may say mountains are certainly green because of trees.
E. That means when meeting air molecules, light goes to different directions(方向).
F. You needn't feel surprised when you see blue mountains or buildings far away next time.

B
Sometimes we may forget something easily. Don't worry. If you want to have a good memory, please follow me. 1.
If you want to remember something well, you need to review it regularly. After you learn the material, you need to review it right away, then two days later, then a week later, then two weeks later, and then a month later. 2.
My second piece of advice is to mark the important parts of your book. This will help you in two ways. For one thing, it will help you concentrate on(专注于) the most important parts. It is always easier to remember only the key points. 3. When you open your book, the coloured parts will show you the most important parts at once.
4. One good time for memorizing information is in the evening. Review what you have learned before going to bed. It will be kept in your mind deeply. The other good time is in the morning because you have just rested and your brain is fresh and clear. 5.
课时作业本 英语(南通专用)八年级上
A. For another, this will make the review easier.
B. Here is some advice to help improve your memory.
C. Another piece of advice is to review at a proper time.
D. You have to read the whole book from the beginning to the end.
E. So it's easy to remember the important information in the morning.
F. After a month, you will find that you can remember the material easily.