"If there is no dust" PPT courseware download 5

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"If there is no dust" PPT courseware download 5

Freely read the last sentence of sections 4-6. What did the tablemates discover through discussion?

Read sections 4-6 silently, cooperate with deskmates, and complete fill-in-the-blank exercises orally.

written material

Advantages: low cost, durable, waterproof, lightweight.

Material: polyethylene.

Proportion of waste particles in garbage: 40%

Disadvantages: flammable and produces toxic gases when burned

While plastic brings convenience to people's lives, it also brings "white pollution" to the environment.

For example, when plastics burn, they produce toluene, which can cause blindness.

Comprehension explanation method:

1. The diameter of dust particles is generally between one millionth of a millimeter and several hundredths of a millimeter.

2. Dust that can be seen by the human eye is the largest among dusts, while fine dust can only be seen under an electron microscope.

3. If there is no dust in the atmosphere, strong sunlight will make it impossible to open your eyes.

Appreciate the accuracy of word choice

1. "The diameter of dust particles is generally between one ten thousandth and one millionth of a millimeter." Can the "general" be deleted? Why?

2. What is the original meaning of "behemoth"? Does it contradict "the diameter of dust is generally between one ten thousandth and one millionth of a millimeter"? Why?

3． "Sunlight is reflected by dust, and its intensity is greatly weakened. What is the role of "big" in a sentence?"

The text tells us: "Everything has its two sides." Please connect with things around you and give one or two examples to illustrate this principle.

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"If there is no dust" PPT courseware download 6:

"If there is no dust" PPT courseware download 6 Please ask students to read the text freely and softly, pay attention to the correct pronunciation of the characters, read the text thoroughly, and think while reading: Are the thoughts you just had the same as the content of the text? What are the similarities and differences? Appearance (m) Chao (zhāo) Hui Diameter (..

"If there is no dust" PPT courseware download 4:

"If there is no dust" PPT courseware download 4 The power of dust According to a survey: 25% of the defects of repaired DVD players on the market are caused by dust. In dry, sandy and dusty areas in the north, as well as heavily polluted cities, this proportion is even higher. ..

"If there is no dust" MP3 text reading download:

"If there is no dust" MP3 text reading and download Dust is something that everyone hates. It hinders environmental sanitation and harms human health. Therefore, throughout the ages, people have always wiped their clothes diligently to prevent them from being contaminated by dust. However, have you ever thought that human beings cannot live without dust. ..

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Update Time: 2024-10-04

This template belongs to Chinese courseware People's Education Press fifth grade Chinese textbook industry PPT template

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