If there is no dust in the air Read the answer

1 What method of explanation is used in paragraph 1?

2 What is the "accident" in the phrase "the existence of dust often brings accidents" in the first paragraph?

3 What would happen to the earth if there was no dust in the air? Please divide the article according to the content of the article.

4 Can the word "primary" be removed from the underlined sentence in the first paragraph, and why?

5 In the process of human survival and development, sometimes dust is also inseparable. Please follow the content of the article, through imagination. Write about one way that humans might use dust to their own service and present it in concise language.

Answer. 1 column of numbers, examples.

2 Surgical accidents.

3 The earth's surface will become unbearably hot; There will be no clouds and rain in the sky; Harmful rays from the universe will directly enter the earth's surface, posing a deadly threat to humanity. (The meaning is correct).

4 No, because "primarily" means the most important of the things in question, and it means that the main causes of dust are human activities, the natural weathering of the earth's crust, and the movement of various celestial bodies in the universe, but there are other reasons for its creation, and it would be too absolute to be true to remove them.

5 There is no uniform answer. Example 1: Dust particles can be used for artificial rainfall to solve the drought caused by climate warming.

Example 2: Dust can be used to absorb a portion of radiant heat to control the discomfort caused by rising or decreasing temperatures. (as long as the knowledge provided in the article is used and there is some feasibility).

1. The role of the paragraph in the text is:

3. Read the first paragraph intensively, and briefly talk about the specific performance of the "protective film" of dust.

Condensation nuclei are

5. Can the dotted "general" presumption in the paragraph be deleted? Tell us why.

1. The transitional role of connecting the previous and the next.

2. (1) Without dust, the light from the sun will not be reflected, scattered and refracted, and the earth will be pitch black.

2) Without dust, the temperature on the surface of the globe will be incredibly hot.

3) There is no dust, and the clouds in the sky are also very difficult to form.

4) Without dust, many harmful rays in the universe will enter the earth's surface unhindered and pose a deadly threat to humans and all living things.

3. (1) The combination of dust and water vapor becomes cloud droplets, which reflect a part of the solar radiation that hits them back to space. (2) Dust can absorb a part of radiant heat.

4. Condensation nucleus is a water droplet embryo formed by adsorbing water vapor on its own surface when the air and other hygroscopic particles such as dust and smoke particles reach a saturated state and the relative temperature reaches 300% 400%.

5. No, you can't. "General" indicates that the radius of the particles is usually between millimeters, and the deletion becomes a certain range within this range, which is too absolute, thus reflecting the accuracy of the explanatory language.

If there were no dust in the air, the earth would be pitch black;

If there were no dust in the air, the earth would be extremely hot;

If there is no dust in the air, it is difficult for clouds, rain, thunder and lightning to form in the sky;

If there were no dust in the air, harmful rays in the universe would pose a deadly threat to humanity.

Dust has both disadvantages and advantages.

You can't have dust in the air.

1.Appropriately fill in the words "scatter" and "reflection" in the horizontal line of the second natural paragraph.

a b 2.Second, what do the two dotted "they" in nature refer to?

they" means. they" means.

3.The order in which this article is explained is:

a.Chronological order bLogical order cSpatial order dSequence of procedures.

4.What is the method of explanation for each of the underlined sentences in the text?

5."Dust is mostly hygroscopic. This sentence is taken from the text, and you think it should be put back at the beginning of the paragraph?

A: 6Briefly use a set of analogies: "If there really were no dust in nature, what would be the situation for us?" ”

A: 7Can the dotted words be removed from the following sentences, and why?

Even some things that people regard as "waste" often have their existence value that cannot be ignored.

Reflection bScatter.

2.refers to "soil and rocks"; refers to "these and other organic particles." ”

4.Column numbers, compare 5Fifth natural paragraph.

6.If there is no dust in the atmosphere, the strong sunlight will make it impossible to open the eyes, if there is no dust in the atmosphere, the sky will become white, if there is no dust in the air, how monotonous nature is! If there were no dust in the air, everything on the ground would be wet, and if there was no dust in the air, there would be less and less water on the earth, and eventually it would dry up completely, and living things would not be able to survive.

7."Often" is the majority of the meaning in the text, and if "often" is deleted, it will become the meaning that all things that are regarded as waste have their existence value that cannot be ignored.

8.Everything has two sides.