By observing the activities of a large number of animals and plants, it is found that there is a mechanism similar to a clock in the life of animals and plants, which is called "biological clock". Through the study of this article, students can learn a lot about animals and plants. If they want to discover more phenomena, they must learn to observe carefully. In this paper, the total score method is adopted. The first paragraph roughly shows that nature has always been a wonderful place. The second, third and fourth paragraphs describe the different activity times of plants and animals respectively. The last paragraph reveals that the "living clock" is the "clock of life", which is the so-called "biological clock". This structural arrangement makes the article clear in level and thorough in reasoning.

& lt teaching objectives >

1, know 14 new words and can write 10 new words. Understand the meaning of words such as "prepare for action", "patrol" and "visit".

2. Learn the content of the text and understand the overall writing order of the total score of the text.

There are many wonderful phenomena in life. Educate students to learn to observe carefully and be conscientious in life.

& lt teaching focus >

1. Read aloud the second and third paragraphs of the text.

2. Understand the key words and feel the author's writing style.

& lt teaching difficulties >

The mystery of nature clock. (No need to explain too much, preliminary perception)

& lt course schedule > 2 class hours

< teaching preparation > slides

first kind

First, start with the topic, stimulate interest and ask questions

1. Students like to guess riddles. Let's see who can guess quickly.

Show me the riddle: All three brothers love racing. They are short and tall. They can walk without feet, but they can tell us when to get up and when to go to school. Blackboard: Clock

2. Students, there is a great and magical magician who can let you master the time when there is no clock. Guess who this great magician is? (blackboard writing: nature)

3. Read the questions together and ask: What's small? " Will it come to mind after reading the topic? And then what?

Students may ask:

(1) What is a natural clock?

What are these clocks like?

(3) How does it tell us the time? (Sort out the students' questions and simply write them on the blackboard.

Second, recognize new words and perceive them as a whole.

1, students, how should we solve the little question mark? Reading the text is the best way to untie our greetings.

2. When reading the text, the teacher reminds everyone to pay attention to two points, (1, to read the pronunciation correctly, you can ask the deskmate or the teacher if you don't know the words. 2. Read sentences fluently. )

Students read the text and the teacher makes a tour. )

The clock in nature is slowly striking. How are you getting ready?

Pass on new words: show the new words to be learned in this lesson. Group cooperative learning, correct pronunciation of new words, mark unknown words; Help each other. If everyone agrees, the group leader will check and read correctly, and ask the group leader to send a "smiling face" to each group member, check the learning situation of each group, focus on helping students with poor ability, and praise the group with good cooperative learning in time.

4. New words My friend brought a series of new words. Can you read these words? (No Pinyin)

When night falls, find out the details of dandelion's quiet cave.