"Bat and Radar" PPT free courseware

Description

"Bat and Radar" PPT free courseware

Part One: Knowledge Tips

Bats are mammals with a mouse-like head and trunk, dark brown fine hairs, and cortical membranes on their limbs and tail. They fly in the air at night and eat mosquitoes, moths and other insects. Its eyesight is very weak and it relies on the ultrasonic waves it emits to guide its flight. When resting, it hangs upside down under the eaves or under a tree by its claws, and hibernates in a hidden place in winter.

Radar is a device that uses extremely short radio waves for detection. It can be used to determine the direction, distance, size, etc. of a target. It is not affected by climatic conditions in use. It is widely used in military, astronomy, meteorology, navigation, aviation, etc.

Bat and Radar PPT, Part 2: Learning Objectives

1. Recognize 12 new characters, be able to write 14 new characters, and correctly read and write words such as "radar, horizontal seven and vertical eight".

2. Practice dividing the text into paragraphs and summarizing the main ideas of the paragraphs.

3. Find out how scientists uncovered the secret that bats can fly at night.

4. Understand the connection between the safe flight of airplanes at night and the flight of bats, and stimulate students' interest in loving and studying science.

Bat and Radar PPT, Part 3: Word Learning

Can recognize characters

bat revelation even keen tethered

bell fly proof barrier fluorescent screen

word explanation

[Enlightenment] A truth understood through enlightenment prompts.

[Sensitive] (feeling) sensitive; (eyesight) sharp.

[Horizontal seven and vertical eight] Some are horizontal and some are vertical, which is a messy expression.

【Obstacle】Things that block the road and prevent smooth passage.

【Imitation】Learn to do something according to a ready-made pattern.

Bat and Radar PPT, Part 4: Word Practice

1. Compare and form words.

vertical rope study

Hard fly poor

2. Choose words to fill in the blanks.

Enlightenment

1. This matter ( ) us, we should stay calm and don’t panic when things happen.

2. This book can () stimulate children’s minds.

Bats and Radar PPT, Part 5: Overall Perception

This article mainly talks about how scientists uncovered the mystery of _________ ____ through ________, and were inspired by it to install __ __ on the aircraft to ensure that the aircraft can ___ ______ at night.

paragraph division

Part One: (1, 2) Talking about night flights of airplanes because people got inspiration from bats.

Part 2: (3~7) After repeated research and experiments, scientists have revealed the secret of why bats can fly at night.

Part Three: (8) Scientists imitated the way bats find their way and installed radar on airplanes, making them safe to fly at night.

Bats and Radar PPT, Part 6: Text Interpretation

Two bright spots appeared in the clear night sky. As they got closer, they could see clearly that they were two lights, one red and one green. Then there was a rumble. It was a plane flying at night.

How can a plane fly safely in the dark night? It turns out that people got inspiration from bats.

Connecting the previous and the next, the relationship between airplanes and bats is named.

Bats fly at night and can also catch moths and mosquitoes; and no matter how they fly, they have never collided with anything, and they can dexterously avoid even an extremely thin wire.

Bats are excellent at flying at night.

Discussion and exchange

Read paragraphs 4-6 of the text and think:

What kind of experiments did scientists conduct to explore the conditions under which bats can fly safely at night? What conclusion was drawn?

Scientists have conducted three different experiments to prove that bats fly at night not with their eyes, but with their mouths and ears working together to find their way.

Try to compare these two sentences. What is the difference? Let’s talk about which conclusion is more scientific.

Sentence 1: Bats fly at night not with their eyes, but with their mouths and ears to find their way.

Sentence 2: Bats fly at night not by their eyes, but by the cooperation of their mouths and ears to find their way.

It is unscientific to throw away "cooperation", because in the second and third experiments, the ears were plugged and the mouth was sealed respectively, which means that the ears or mouth were exposed alone, but the bats lost the ability to detect their way secretly. This shows that pathfinding relies on the simultaneous functioning of these two organs, so the use of "cooperation" in the text is scientific.

Bats and Radar PPT, Part 7: Class Summary

The text mainly talks about how scientists uncovered the secret of bats ( ) through repeated experiments, and were inspired by it to install ( ) on airplanes, which solved the problem of airplanes flying at night. Tell people that research on ( ) can shed some light on human inventions and creations, and guide us to love ( ) and enjoy ( ).

Expand and extend

People have gotten a lot of inspiration from animals and invented many tools. Can you give such an example?

Bats and Radar PPT, Part 8: Homework

1. Try to write a paragraph with the title "The Autobiography of a Bat", using the first person.

2. After class, look for books related to the secrets of animals and plants, read them, understand our nature, and be a good student who loves science.

Keywords: Free download of Chinese PPT courseware for the fourth grade of the People's Education Press, Volume 1, bat and radar PPT download, .PPT format;

For more information about the "Bat and Radar" PPT courseware, please click on the Bat and Radar PPT tab.

"Bat and Radar" PPT courseware download:

"Bat and Radar" PPT courseware download part one content: review old knowledge and consolidate dual bases, read pinyin and write Chinese characters fēi kē xu ji shǐ yn jiū ( ) ( ) ( ) ( ) imitate sentences. Bats scurry around like headless flies. , hanging on the rope...

"Bat and Radar" PPT teaching courseware:

The first part of the PPT teaching courseware "Bat and Radar": Learning objectives 1. Recognize 12 new words such as bat and bat, read the polyphonic character system accurately, be able to write 14 words such as da and mosquito, and be able to write 13 words such as radar and safety. . 2. Read the questions beside and after the text and ask your own...

"Bat and Radar" PPT download:

"Bat and Radar" PPT Download Part One: Review Knowledge Through the study of the previous class, what knowledge did we learn about bats? Bats fly at night not with their eyes, but with their ears and mouth. The title of the article is "Bat and Radar", why...

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Update Time: 2024-11-14

This template belongs to Chinese courseware The first volume of fourth-grade Chinese compiled by the People's Education Publishing House industry PPT template

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