After going home from school late and dealing with simple extracurricular homework, Ding Xuecheng went into the bedroom after eating, took out the learning machine and prepared to use it for the first time.

Ding Xuecheng imitated the method of guessing the teaching design of the science teacher in the morning, imagined the tasks, process and problems of today's magic mirror activity, and wrote them down on the light curtain.

1. Activity 3: "Let's Observe" - our sensory organs, observe the melon, parent-child time (use various sensory organs to observe the objects around us with the family).

2. Our sensory organs and their functions. Objects: fruits (tomatoes, oranges, melons), flowers (osmanthus), yogurt, sweets, birds (larks), mountain streams, pebbles.

3. Problem Design:

(1). What are the sensory organs of our body? What can you feel about each?

(2). What organs do we use to observe objects?

(3). What characteristics of objects can be understood by using sensory organs?

(4). What sensory organs are used in the process of observing melon?

(5). What should I pay attention to in the process of observing objects?

(6). What objects have you observed with your loved ones? Give examples of what sensory organs were used and what was observed.

"Congratulations to Bobo, you will be rewarded with 500 points for designing the 'exploratory experiment' experimental plan in advance."

"In advance? What stage of knowledge is that? ”

"3rd and 4th grade, intermediate. Years 1 and 2 are the lower grades and focus on observational experiences. ”

"I didn't expect to score points like this, and the rewards are really everywhere!"

Ding Xuecheng took out the learning machine and shouted softly: "Turn on." ”

Click on the WLAN settings, scan the surrounding WIFI signals, and a large row is displayed. Ding Xuecheng randomly picked a strong signal, used the master key to decode, and automatically accessed.

Click on the browser, type "human sensory organs" in the search window, click search, the window flashes, and hundreds of thousands of relevant information appear.

I casually found a "sensory organ-360 encyclopedia" and clicked in, and the content that appeared in front of me was to introduce the "sensory organ" - the human body has a variety of sensory organs. Mainly eyes, ears, nose, tongue, skin, etc. Sensory organs are a type of organ that connects the human body with the external environment and perceives changes in the surrounding things.

There is a detailed description below, Ding Xuecheng exclaimed: "It's so convenient, it's so comprehensive, it's really fast, what information you want to check is at your fingertips!" ”

Therefore, Ding Xuecheng checked all the knowledge that needs to be understood in advance, especially the role of people's "five senses" and the five intuitive senses (sight, smell, taste, hearing, and touch) read and memorized in detail; He also searched for maple leaves, chrysanthemums, oranges, tomatoes and other pictures to watch, which pictures were clearer and richer than those in the "album", and he couldn't help but call it "enjoyable".

Before going to bed, Ding Xuecheng logged in to the magic mirror space.

"Bobo-san, it's nice to see you again today!" As soon as Bei Bei saw Ding Xuecheng's friendly greeting, he was less happy and looking forward to the mechanical mode of the previous few times.

"Hello, Babe! The learning machine is very useful, and I made preparations before coming in today, hoping to surprise my friends. ”

"If you prepare, you will stand, and if you don't prepare, you will waste. Thinking about everything is a sign of maturity, and you are making rapid progress! ”

"Well, I will work hard, and I will do my best to do what I promised you, you can rest assured!"

Then, the three friends came together and greeted each other.

Ding Xuecheng didn't talk much nonsense, and directly greeted Beibei: "Beibei, projection today's activity task." ”

The light curtain unfolds to show the content of today's event.

The third activity: "Let's Observe".

Activities:

1. Our sensory organs.

2. Observe the melons.

3. Interactive activities: Together with friends, comprehensively use various sensory organs to observe the objects around you. [Note: Do it again with your family when you get back.] 】

"Everybody's got it, right? Let's go! ”

The four figures disappeared from the classroom space and coalesced in a botanical garden.

The environment is autumn, and there are many large and small greenhouses and greenhouses in the botanical garden, and Ding Xuecheng and the four of them are in a greenhouse, which is full of tomatoes.

Kiki screamed, "So many big and red tomatoes!" Such a maturity. ”

Yanyan looked around and observed for a while before asking, "How do you know?" ”

Ding Xuecheng wanted to explain, so he hurriedly stepped forward and said, "I checked the information in this area, let me tell you." Tomatoes are divided into red, pink, orange-red and yellow according to the color of the peel according to different varieties; According to the shape of the fruit, it can be divided into round, oblate, oblong, and pointed. When choosing tomatoes, choose one that is pink in color, round in color, and has small white dots on the skin, and feels like a faint layer of powder on the surface, and it is very soft to pinch. The pedicle must be rounded, preferably with a light cyan. The kernels are earthy yellow, and the flesh is red, sandy, and juicy. Don't buy tomatoes with pointed, high bottoms, angular or irregular shapes, and don't pick tomatoes that feel light to hold, these are ripe tomatoes. The ripe tomatoes are all red, very hard to the touch, polyhedral in appearance, and the seeds are green or ungrown when you break them open, and there is no juice in the pulp. This is a method used by traders to ripen bananas, coating tomatoes with a chemical drug called 'ethephon', which is less toxic but harmful to the human body if consumed for a long time. ”

"You know so much!" The two girls exclaimed in unison.

He stopped talking, glanced at Ding Xuecheng, and said, "Do you know the origin of tomatoes?" ”

Yanyan was surprised again: "I know, tomatoes are also called tomatoes, but they are all over the world, what else does it come from?" ”

Binbin felt that Ding Xuecheng couldn't answer, so he was about to start talking, but Ding Xuecheng's leisurely voice came from his ears.

"Tomatoes, also known as tomatoes and persimmons, are rich in carotene and lycopene. The normal outdoor growing season is summer and autumn, and the ancient name is June persimmon and good news three yuan. Native to Peru and Mexico in South America, it was originally called 'wolf peach'. The fruit is rich in nutrients and has a special flavor. It can be eaten raw, cooked, processed into ketchup, juice or canned whole fruit. Tomatoes are one of the most widely cultivated fruits and vegetables in the world, cultivated in greenhouses, plastic greenhouses and other conservation facilities. ”

"It first grew in South America, because of the delicate color, people are very wary of it, as the" fox fruit ", also known as the wolf peach, only for viewing, dare not taste, later a painter, when painting tomatoes, hunger and thirst, really can't help but eat one, since then tomatoes have entered the table, Westerners called tomatoes, after the introduction of China, because of the similar appearance with our persimmons, so we call it 'tomatoes', and now it is an indispensable delicacy in people's daily life."

"Wow, so much knowledge, you know, Bobo-san's is amazing!"

"No wonder Binbin is intoxicated with explaining to the little girl, this voice of exclamation, worship and praise is so beautiful!"

At this time, the light curtain shakes, and a line of words is displayed on it: [Question 1]. What sensory organs are used to identify whether tomatoes are ripe? Interpret the vision.

"Huh? Beibei, this time answering questions is interspersed in the course of the event? ”

"Yes, keep an eye on the light curtain and be ready to answer questions."

"You can taste the color, size and shape of the tomato with your eyes, and you can taste the softness and hardness of the tomato by hand. The answer is eyes, hands, tongue. Vision is a physiological word. Light acts on the visual organ, the eye, causing it to feel the excitement of the cells, and its information is processed by the visual nervous system to produce vision. Through vision, people and animals perceive the size, brightness and darkness, color, movement and stillness of external objects, and obtain various information that is of great significance to the survival of the body, at least more than 80% of the external information is obtained through vision, and vision is the most important feeling of people and animals. ”

If you answer correctly, you will be rewarded with 30 points; In addition, 100 points will be awarded for erudition. ”

Ding Xuecheng was overjoyed: "Haha, check the information in advance to prepare, and it really works!" ”