1, know four new words such as "needle".
2. Read and recite the text correctly, fluently and emotionally, and experience the mystery and interest of nature.
3, master some ways to identify the direction, pay attention to things around, and discover the consciousness of scientific knowledge.
4. Cultivate love for nature and interest in observing things.
Key point: master some methods to distinguish the direction
Difficulties: Why are the sun, Polaris, trees and snow natural compasses?
Teaching mode: independent inquiry, cooperation and communication.
Preparation before class:
1, compass
2. Courseware: natural compass (tree shadow, Polaris, thick leaves, snow).
3. Tree painting, Polaris painting, etc.
4. Electronic organ.
5. Understand other ways to tell the direction.
6. New word card, physical display platform.
Class hours: two class hours.
teaching process
First, riddle introduction, suspense and excitement.
1. Students, the teacher has a riddle here. Who can guess? Show me the riddle: it's shaped like a clock, not a watch, and it doesn't show hours and minutes. Invented by the ancients in China, it is essential to find the direction. )
2. Answer by name (compass)
3. The physical display platform displays the compass. What is the function of compass?
Students, what will you do if you get lost in the city? (Call uncle policeman, call 1 10, call parents, ask pedestrians ...) What should you do if you get lost in the wild and don't have a compass? The text we are going to learn today is to tell you some ways to get lost in the wild and identify the direction. Do you want to know? Let's go and have a look.
5. blackboard title: if you get lost in the wild.
6. Explain: What does "if" mean? (that is, if, if)
"Wild" is a place far away from residential areas.
"Getting lost" means not knowing the direction and going the wrong way.
Second, the first reading perception and cooperative literacy
1, the teacher reads the text (while a student is playing "Song of Spring") and thinks: What do you know?
2. Students can read the text freely, draw words they don't know, and mark how many bars the poem has, and communicate in groups.
Please take out your dictionary and look up the words you don't know.
4. The teacher uses the form of "driving a train" to check the situation of each group learning new words by themselves.
5. Students read the text again, find out the words they don't understand, and communicate and solve them in groups; If you can't explain clearly in the group, present it to the whole class for communication; Write the words that students can't understand on the blackboard and let the teacher explain them.
6. Explanation of words:
(1) Canal: an artificially opened waterway for irrigation or drainage.
2 panic: I am not calm and anxious.
(3) Nature: Natural existence, natural production, not artificial manufacture.
4 Loyalty: Loyalty and reliability.
Third, read the text carefully and study independently.
1. Read the text by name and think: What kinds of things can the text tell you? (Blackboard: Sun, Polaris, Trees, Snow)
2. What chapters in the text tell us that the sun, Polaris, trees and snow can help us to find our way? (Section 2-5)
3. Choose your favorite section from 2-5 (study in groups of four).
Teacher courseware demonstration:
Tips for group study 1: When (), rely on () and use () to tell the direction.
Tip 2: read a chapter in the group in a collective and individual way; Think about it.
Tip 3: draw with "﹏" line; Discuss and ask questions in the group; Finally, communicate in class. (Writing on the blackboard: reading, thinking, drawing, discussing, asking and speaking)
Fourth, report reading aloud and classroom communication.
(1) group representatives read the text and demonstrate four ways to identify the direction in the text with the help of courseware.
1, how does the sun show the way? Choose a group to study the second section: At noon, the sun is in the south and the shadow on the ground points to the north. (Courseware demonstration) Let's read the second section with praise. Now, please be the sun. Change the sun in the second paragraph of the text to "I" and read it together. It seems that students are really smart, so how can you tell the direction at night? (Polaris)
2. How does Polaris point the way? Part III Group Report: Some students may not know Polaris. Will our group take you to the night sky? (Show courseware: Polaris) On a clear night, Polaris always hangs high in the north. In clear weather, there is the sun during the day and the Polaris at night to guide the way. What should we do if it rains? (A big tree can show the way)
3. How does the big tree show the way? Choose to study the group report in the fourth section: on rainy days, the side with dense branches and leaves is the south, because the south is exposed to the sun for a long time, and the branches and leaves grow luxuriantly, while the side with sparse branches and leaves is the north. (Courseware demonstration)
Winter is coming, snowflakes are flying and many leaves are falling. What should you do if you get lost in the wild at this time? (Know the direction by snow)
How does snow guide the way? Group report on studying Section 5: The snow in the ditch after snow melts quickly in the north, because the sun shines, the ditch can't stop the sun, and the sun shines directly on the snow in the north. The slow melting side is the snow in the south. (Courseware demonstration)
(2) The sun, Polaris, trees and snow can show us the way. What kind of compass can you call it? (natural compass) blackboard writing: natural compass.
Section 1: If you get lost in the wild, don't panic. What should you do (calm down) and why? Student: There are many natural compasses in nature, which will help you find your way. (blackboard writing: determine the direction)
(4) Read Section 6 together. Nature has many natural compasses. As long as we observe carefully and think more, we will find the mystery of nature, which careless children can't get. ).
(5) Extending and guiding discovery.
1. Who else knows the way to tell the direction?
You can find a stump in the forest and tell the direction according to its annual rings, because its annual rings are always wide in the south and narrow in the north.
You can observe an independent tree with lush foliage on the south and sparse foliage on the north.
You can tell the direction through the ant's cave. Because most of the holes of ants face south.
(4) where there are many rocks, you can also find an eye-catching rock for observation. The mossy side of the rock is the north side, and the dry and bare side is the south side.
2. Observe carefully in the later life, and pay attention to find out what other methods can distinguish the direction.
(6) Emotional reading, summarizing the full text.
1, the teacher plays Song of Spring. With the music, students read the text from beginning to end and find out the antonyms of this lesson (sparse-thick, fast-slow, south-north).
2. Boys and girls read each other;
3. Read aloud between groups;
4. "Driving a train" style, everyone reads a sentence.
5. Teachers guide reading (while students are reading)
6. Teachers guide reading (during students' reading)
7. Act out the text and deepen the theme
① Teachers and students perform together;
② Team cooperation performance;
③ Select a team to report the performance.
Today, we have a little girl who got lost in the wild. Let's help her, shall we?
Lost girl (crying): Why are they all trees? Why is there no road? I can't go home.
Sun: Stop crying, son. Let me help you. It's noon. Look, I'm looking at that big tree. The shadow of the big tree refers to the north.
Polaris: Don't cry, don't cry. At night, if the weather is fine, just find me and you will know where the north is.
Tree: I can help you too. Look at my leaves. On the one hand, it is rich, on the other hand, it rarely sees sunshine. Leaves are scarce. The thick side is south and the thin side is north.
Snow White: If it is winter, you just need to look at me. The light intensity in the south makes me melt quickly, and the light intensity in the north makes me slow down naturally.
Students: Yes, we will all lend a hand of friendship to help you.
Lost little girl (wiping tears): Oh! I see, thank you, goodbye!
8. Summary of this lesson
This paper introduces several ways to identify the direction by using the sun, trees, Polaris and snow. Students also talk about other ways, such as stumps, ants and stones. As long as you observe carefully and think more, you will find more secrets of nature.
blackboard-writing design
If you get lost in the wild.
(Sun map) (Polaris map) (Tree map) (Snow map)
Observe carefully and think more.