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Authoritative PPT Summary
"The Secret of Manna" PPT courseware
Part One: Teaching Objectives:
1. Clarify the author’s ideas and grasp the main content of the article.
2. Understand the characteristics of popular science writing and appreciate the accurate and vivid language style of scientific essays.
3. Explore and understand the laws of things and establish a scientific outlook on exploration.
Teaching focus:
1. Grasp the key sentences and clarify the structure and content of the article.
2. Taste the key words and sentences and learn the language features vividly introduced in the article.
Teaching difficulties:
Explore and understand the laws of things and establish a scientific outlook on exploration.
The Secret of Manna PPT, Part 2: Knowledge Links
1.About the author:
Qiu Chunlin, contemporary writer and professor. (The pen name is Ge Fu, etc., born in 1930 in Yancheng, Jiangsu Province. He began to create in his spare time in the early 1950s, writing not only essays and fables, but also scientific essays and literary theory. The published collections of fables include "Fig", "Monkey Stabs Tiger", "Sail and Rudder" and other works have been adapted into animated films.)
2. Understand the meaning of words
Manna: The text refers to the whitish and sugary excrement excreted by aphids.
Auspicious: Refers to good luck.
Dreaming: sleeping, falling asleep. Pursuing something even in sleep describes an urgent desire.
Absurd: (thoughts, words, and deeds) are so wrong that they make people wonder.
Bustling: bustling, harmonious; bustling, chaotic. This article refers to the way ants line up and hustle.
The secret of nectar PPT, the third part of the content: Explanation of the topic:
"Manna" is a whitish and sugary excrement excreted by aphids, which is not uncommon. The "secret" adds a mysterious veil to "Nectar", and the title sets up suspense, attracts readers, and reveals the truth.
Read the text aloud and get a preliminary understanding of the content of the article
This scientific essay selects "manna" which is often mentioned in ancient Chinese classics as the object of explanation, introduces its true identity - aphid excrement, and explains in detail the causes of its production and its harm.
Grasp key words and clarify the structure of the article
The first part (1--3) introduces the sacred status of nectar in the hearts of ancient Chinese people.
The second part (4--11) "decrypts" the nectar from a scientific perspective and unveils the "divine object" and "holy medicine".
The fourth natural paragraph is a transitional paragraph that connects the previous and the following. The sentence "The so-called nectar is not the 'spirit of the gods' descended from heaven at all. It is really ridiculous to say that it is just the excrement of an aphid", which reveals the secret of nectar. The Mystery, the second part of the general article, is divided into three levels:
The first level (5) introduces the name, species, living habits and harm of aphids.
The second level (6-7) introduces the process of nectar formation.
The third layer (8-11) explains the harm of aphid honey.
The Secret of Manna PPT, Part 4: Scientific Language
1. Scientific and accurate language
(1) More than 2,000 species have been discovered around the world. Among them, except the gall aphids, they are all the enemies of crops. Wheat aphids, bean aphids, cotton aphids, vegetable aphids, peach aphids, orange aphids, apple aphids, botrytis aphids, sugarcane aphids, etc. that harm crops, vegetables and fruit trees are all members of the aphid family.
"Already discovered" means that there are more than 2,000 aphids discovered so far, and there may be more that have not been discovered, which shows that the number of aphids is truly astonishing. Reflects the accuracy of expository language.
(2) According to analysis, carbohydrates account for about 70%, saccharin accounts for more than 20%, and protein accounts for 3%.
2. Language with strong literary color - vivid and interesting
When an aphid is foraging, it first uses the short hairs on its lip to explore the surroundings. Once it finds a prey target, it pierces the plant tissue with its sharp, sucking mouthparts, and keeps doing so. to absorb sap from plants.
When introducing the living habits of aphids, write that aphids use "explore", "discovery" and "suck" when foraging, vividly showing the scene when aphids suck plant juice, and vividly introducing the life characteristics of aphids.
They follow closely behind the aphids and gently tap the ants' butts with their tentacles from time to time. The aphid felt very happy after being slapped, so it raised its buttocks and excreted drop by drop of aphid nectar, giving the little ants a hearty meal.
The Secret of Manna PPT, Part 5: Exploration
How to understand the attitude and behavior of ancient people towards nectar at the beginning of the article?
There is a sharp contrast between the attitude and behavior of ancient people towards nectar and the results of the revelation of nectar. The nectar, which was regarded as the essence of gods by the ancients, is actually the excrement of aphids. This makes people dumbfounded and dumbfounded. The revelation of the secret of nectar shows that the understanding of things cannot just stay on the surface, but must gradually understand the essence through continuous exploration.
The nectar that ancient people regarded as sacred was just the excrement of aphids. The secret was revealed, which made people dumbfounded and dumbfounded! What kind of enlightenment does this fact leave us?
1. Get rid of superstition and understand things scientifically!
2. Think independently, not superstitious about the ancients, authority, or books.
3. Advocate science, oppose ignorance and superstition, oppose pseudoscience, and oppose cults.
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"The Secret of Nectar" PPT:
"The Secret of Manna" PPT Part One: Learning Objectives: 1. Clarify the author's ideas and master the main content of the article. 2. Understand the characteristics of popular science writing and appreciate the accurate and vivid language style of scientific essays. 3. Explore the laws of understanding cultural relics and establish scientific...