At this time, Zhang Lu, who was not far behind Beibei, saw that the children were so hesitant, she finally couldn't help it, so she stood up and walked to the edge of the vineyard and suddenly said loudly: "Wow, what a big vineyard." The grapes here are sure to be delicious when ripe, and I have to admit that grapes are really an irresistible delicacy, tsk! ”

Zhang Lu deliberately sighed loudly, she deliberately let the children hear it to remind them that human beings, as advanced animals, our main food includes fruits. After Zhang Lu finished speaking, he smiled evilly and slowly set his eyes on Beibei.

Bei Bei didn't notice Zhang Lu who suddenly appeared in front of her left until this time, so she glanced at Zhang Lu angrily. The man was wearing a professional white shirt and trouser suit today, with a neat and smart hairstyle, and she didn't look like a tourist at all.

However, the children didn't care about these, Li Zitong, who had been thinking with her chin in her arms, was suddenly inspired after listening to Zhang Lu's casual exclamation, and she happily raised her hand and said to Teacher Beibei: "I think this world has plants first, and then animals." Because there are many animals whose main food is plants, such as cows and sheep and other animals that eat grass. Therefore, in this world, the emergence of animals should be premised on the emergence of plants, and after the emergence of animals, other high-level animals will be developed, not only plants as food, but also other low-level animals as food. ”

After listening to Li Zitong's irrefutable complete answer and beautiful explanation, Bei Bei happily motioned for her to sit down: "This classmate's answer is completely correct, please applaud and encourage." ”

Dozens of children suddenly burst into warm applause, Bei Bei glanced at Zhang Lu over there, she was looking at herself slyly, Bei Bei couldn't judge for a moment whether Zhang Lu wanted to help herself or deliberately made trouble.

However, in order not to delay everyone, Bei Bei had no time to estimate Zhang Lu, so she then asked, "Now, can the classmates answer me?" Where does the energy we rely on come from? ”

Suddenly, the children fell into deep thought again, and Bei Bei took the opportunity to glance at Zhang Lu again, and found that she was staring at Lei Ping next to her, and Lei Ping's gaze quickly turned away after encountering Zhang Lu. Bei Bei knows that Zhang Lu likes to bully people who are particularly shy and honest the most, Lei Ping looks like such a stupid boy, almost like himself, so he is the easiest to be bullied by Zhang Lu.

Zhang Lu suddenly found that Bei Bei was glaring at him, so he slowly returned to Bei Bei's back with a wicked smile and came to Kong Wenjia's side. Bei Bei stared at Zhang Lu viciously all the way, and it was only then that she realized that Sister Kong Wenjia was also here, and nodded happily to Sister Kong, revealing her baby-like bright smile.

The naughty Zhang Lu took the opportunity to sit down next to Kong Wenjia, and then put her face to face with Kong Wenjia, and the two smiled at Bei Bei together. Beibei's long eyelashes suddenly jumped up, her eyes immediately changed, and a fierce light stabbed at Zhang Lu next to Kong Wenjia.

Zhang Lu smiled and showed a smug expression to Beibei, Kong Wenjia pushed her away at the right time, so Zhang Lu lay down to the side very cooperatively and didn't get up again. It was only at this time that the expression of the three sisters finally ended with Bei Bei's satisfied smile.

"Students, have you thought of the answer?" Bei Bei turned her head and asked everyone.

"Teacher, I think it is the soil on the earth that provides energy to all plants, and finally indirectly to all living things."

"I think all living things have energy from the sea, even animals and plants on land, they can't do without water, and this water comes from the ocean."

"Animals and plants need to breathe, and I think their energy comes from air."

The children expressed their opinions one after another, and Bei Bei obviously didn't get the results she wanted at this time, and she looked at Teacher Lei Ping next to her.

Lei Ping smiled and said, "Teacher Yang is worthy of being a professor at a famous school, and the children's minds have been mobilized by your course, and they have never been so active." I think the students are good, you can't expect them to answer every question correctly, they are still elementary school students. ”

"Hmm." Bei Bei nodded, looking at her classmates and motioning for everyone to stop.

"The students' answers have a certain amount of truth but are still a bit one-sided, you are answering the basic conditions for the survival of living things, but my question is where the energy of living things comes from. In fact, almost all living things on Earth use the energy they rely on for their survival and daily activities from the sun. ”

"The Sun?!" The classmates muttered quietly.

"Yes." Bei Bei picked up the kettle next to him, took a sip of water, and explained: "In addition to all kinds of meat, our food also includes vegetables, fruits, rice, etc., right?" ”

"Hmm," the classmates nodded together.

"So, the appearance of animals is premised on plants, and to use a simple analogy, if there is no grass in the world, then there will be no sheep, so there will be no wolves. Of course, there will be no predators that feed on other animals, such as snakes, lions, tigers, etc. Because they don't have a source of energy, the reason is that they don't get the food they need to survive. ”

Bei Bei paused and continued: "So, the energy of most animals comes from plants, and without grass, there are no cattle and sheep, and there are no jackals, tigers and leopards. Without seaweed, there would be no fish, shrimp, dolphins, whales, etc. The emergence of plants has led to the diversification of energy transfer to other higher organisms, giving rise to the emergence of other new species. ”

So, where does the energy of plants come from? Experiments have been done that from budding to growing into an adult, the soil on which a plant depends does not decrease. However, most plants are rich in water, so they absorb water from nature. However, water is not the fundamental source of energy for other animals, water is just a basic substance for the survival of most organisms, and it is not counted as energy. Therefore, there is only one source of energy for plants, and that is the radiation of the sun. Plants absorb the energy of solar radiation through photosynthesis and turn it into their own biological energy, so that plants have the energy to grow and grow, do you understand? ”

The children listened attentively to Mr. Beibei's speech, and everyone nodded their heads, expecting Beibei to continue.

Of course, Bei Bei didn't mean to end, she looked around for a while and thought for a while and continued: "In addition to the biological energy of animal and plant survival activities, there are many, many forms of energy around us. For example, wind energy, electric energy, and firewood, coal, and oil that have been eliminated, these energy sources are also important energy sources for human survival and development on the earth, and they all come from solar radiation, and the energy they contain comes from the sun.

"Let's talk about wind energy first, it is obvious that the atmosphere on the earth's surface must have energy, and the energy of the air flow inside the atmosphere is because the solar radiation transfers heat to the air, so the wind is formed, and there is wind energy. As for electrical energy, first of all, thunder and lightning in nature, solar radiation can make some active air and dust in the atmosphere form clouds, and the interaction and collision of clouds will cause clouds to produce electric charges, and then release thunder and lightning. As for the common electrical energy in our lives, they also come from solar radiation, and the heat energy brought by solar radiation causes the water on the earth's surface to evaporate and migrate in the air, and finally reach some higher land and form rivers and lakes, which then flow to the sea. People use the gravitational potential energy of these water sources to turn their gravitational potential energy into electrical energy by cutting magnetic inductance lines. ”

"As for firewood, you should think that firewood is a plant, and its energy comes from the sun, coal and oil, which are all tens of millions of years ago when plants were buried for a long time, and they also come from the sun. So students, now you know what the sun means to us. If there is no sun, there will be no life on the earth, there will be no beauty and ugliness, there will be no friendship, family affection, and love. ”

After Bei Bei finished speaking, the classmates hadn't come back to their senses, and everyone looked at Teacher Bei Bei attentively and looked forward to her continuing to speak. At this time, there was a sudden applause from behind Beibei, it turned out that Zhang Lu stood up and clapped his hands while walking over this side and said, "Teacher Yang's speech is really amazing, I am very happy to hear such a wonderful speech from Teacher Yang." ”

The students only reflected at this time, and everyone followed Zhang Lu and Lei Ping to give Bei Bei a warm applause.

Bei Bei was angry and funny about Zhang Lu's sensational behavior, turned her head to look at her in confusion, as if complaining that she had messed up her train of thought, and Bei Bei was about to wrap up. Kong Wenjia sat in place and looked at the two of them with a smile, her face full of happiness.

"Okay, students, let's make a final summary. In the short history of more than 2 million years on this earth, we humans have been dependent on the energy of the sun to thrive, but there is still one energy that is exceptional, and that is nuclear energy. ”

"Nuclear energy is similar to the energy of the sun, which reorganizes the structure of the atoms inside the matter through harsh high temperature and high pressure conditions, so as to release the original nuclear energy of the matter. This is the only primitive energy that does not depend on solar energy, and it is also a manifestation of the reaction of human civilization to the energy of the universe. ”

"The objective law of the mutual transfer of energy between substances in the universe is eternal. Countless stars in the universe transfer their energy to the surrounding planets through radiation, and the energy radiated by these stars transfers energy to the next ring in various ways on a few conditional planets, thus creating life and enabling these lives to continue and develop, thus creating civilization. Therefore, all life in the universe is the pride of the universe, and they are all the energy inheritors of the advanced form of the universe. ”

"Finally, we can finally point to the topic of today's topic, through an afternoon of labor, let us think about where the energy of life production activities comes from, so as to see the essence of life, the essence of all life in the universe is energy. The transmission of energy within the universe will not stop, and life, as an advanced form of cosmic energy, will not die out on some planets with conditions. That's the topic of today, the relationship between life on earth and the sun, the relationship between life and energy. It's just that life on earth has an important characteristic, that is, it relies on water to cultivate a life form with high-level energy adaptation and management, and water is an important medium for the adaptation and transmission of life energy, which is not included in the scope of today's curriculum. So, that's the end of today's lesson, it's a pleasure to be with you, students. ”

After Bei Bei finished speaking, she stood up, looked at her classmates with a smile and bowed slightly. Teacher Lei Ping next to him also stood up and said happily: "Thank you, Teacher Yang, for giving us such a meaningful lesson today, everyone applauds and thanks Teacher Yang." ”

In the end, the classmates all stood up and gave Bei Bei a long and warm applause and the most enthusiastic smile.