The blue sky was covered with a silky cloud curtain

1) The blue sky was covered with a silky cloud curtain, and after a while, a colorful halo appeared around the sun. It's like a rainbow, but it's not as bright as a rainbow; The color arrangement of the rainbow is inner ultraviolet red, while the halo is just the opposite, which is outer ultraviolet and inner red. This is the "halo", commonly known as the "wind circle".

2) Our ancestors observed and recorded the "halo" very early. Far away in the oracle bone inscription of Yinxu, the word "halo" has appeared. In the Western Zhou Dynasty, the "halo" was officially recorded as a celestial phenomenon.

And Europeans did not have a detailed record of "halo" until 1630, more than a thousand years later than China.

3) Although people have noticed this beautiful light phenomenon for a long time, it has been nearly a hundred or two hundred years since the scientific explanation of its cause was given. In 1666, Newton made a very simple experiment that had a great influence on the development of science later. He lets a beam of sunlight shine through the prism, and it turns red.

Orange, yellow, green, blue, indigo, and purple color bars. This led to the first realization that sunlight was originally made up of seven different colors of light, and when they passed through a prism, due to the wavelength. The refractive angles are different, so that their true colors are revealed.

These two left laid the foundation for the scientific explanation of "halo" (4) sounding data show that the white silk-like cloud curtain, whose height is more than 5,000 meters above the ground, is composed of hexagonal column-shaped Xiaoice crystals. If the hexagonal cylinder is not adjacent to each other, it is actually a triangular prism. Therefore, the hexagonal cylindrical ice crystals are like a prism, which can divide sunlight into seven color bars.

When countless trillions of Xiaoice crystals are irradiated by the sun, various colors of light are refracted at a certain angle, forming a gorgeous and colorful love ring.

5) People are interested in halo not only because of its colourful colours, but also because it is a precursor to weather changes. According to the statistics of China's Altay Prefecture in Xinjiang, there were 1,052 "dizziness" in 1980, and the wind appeared within two days after the "dizziness". Significant weather changes such as rain accounted for 80.

6) However, not all 'halos' are signs of wind and rain. After long-term observation, meteorologists have found that when the duration of the "halo" is less than 1 hour (commonly known as the "short halo"), wind or rain will occur in the next 12 hours to 36 hours; When the duration of the "halo" is more than 5 hours (commonly known as "long halo"), there will be no wind and rain.

7) The beautiful love ring is nature's weather forecast map, we understand and use it to observe the wind and clouds, and we can better arrange work and life.

1.What do they refer to in the three natural paragraphs, and what the word in the four natural paragraphs correspond to.

They are the light emitted from the sun, and the second is the "seven-colored bar" and "brilliant and colorful".

I'm doing it, and I won't either, and I won't be able to compare it to looking at the clouds and knowing the weather.

1 The object of the selected text is .

2 In what two ways does the first paragraph of the text illustrate the difference between halo and rainbow? Here's how to explain it.

1) (2) 3 "this discovery" in the selected paragraph refers to ( ).

a Sunlight is made up of seven different colors of light.

b Experiments to provide a scientific explanation for the causes of halos.

c This light phenomenon has been noticed for a long time.

d Different refractive angles make them show their different colors.

4 The correct understanding of the content of the selected paragraph is ( ).

a halo is formed by the refraction of sunlight by ice crystals in clouds.

b Halo is formed by the reflection of sunlight through air.

c Halo is formed by the refraction of light rays through ice crystals in clouds.

d halo is formed by the reflection of light rays through air.

5 What is the example of the Altay region of Xinjiang given in the first paragraph of the selected text?

Answer: 6 What are the two types of halos in the first paragraph? Briefly talk about the effects of each of these two types of halos on the weather.

Answer: 7 Imitation example sentence: People are interested in halo not only because of its colorful color, but also because it is a precursor to weather changes.

8 The selected text explains "halo" from several aspects in turn, and the correct one summarized below is ( ).

A explanatory concept: retrospective history, explanation of causes, and explanatory role.

b Explain the concept of tracing history Describe experiments Divide into types.

c. Tracing Color, Explaining the Concept, Explaining the Cause, Explaining the Role.

d Tracing Colors Describing Experiments Explaining Causes Dividing Types.

Answer: 1 dizzy.

2 For comparison. (1) Brightness and (2) Color arrangement.

3 a4 a5 halo is a precursor to weather changes.

6. Short halo: there will be weather changes such as wind and rain; Long halo: There will be no change in wind and rain.

7 "Omitted". 8．a

Question 1: (1) Brightness and (2) Arrangement of colors.

Question 1: Categorization Clearly explain that not all "halos" are signs of wind and rain (or answer "short halos are signs of wind and rain, long halos are unchanged", etc.).

Question 1: Test question analysis: From the "semicolon" between the sentences in the paragraph, we can judge two aspects, from the two sentences "but there is no bright rainbow" and "the color arrangement of the rainbow is ultraviolet red inside", it should be seen that "bright" and "color" are written.

Comments: This question has a certain degree of difficulty, and the text information in the passage is relatively implicit, which is not easy for students to judge. Expository texts often explain things that are more complex and explain more than one aspect of the situation, so to answer such questions, you should read the passage carefully, pay attention to the relationship between the sentences before and after and have some hints, such as punctuation, such as transitional words, to find a breakthrough from the subtleties.

Question 1: Test question analysis: Pay attention to the semicolon in this paragraph, you can see that there are two types of explanations according to the length of time when "halo" appears; Grasp the first general sentence to understand the object of this question. The answer to "role" must mention the word "organized" (or "organized").

Comments: This question is difficult, the classification and explanation method in the passage is not too obvious, and the "role" students do not know much about it. "Classification" is mainly for the more complex description objects are divided into different situations to explain separately, so that readers can clearly understand the characteristics of the description objects, and the classification method in the expository text is well reflected in the relationship between paragraphs.

The categories must have different characteristics.