Kiki was looking around again, and suddenly pointed ahead and said, "There seems to be the sound of running water in the woods over there." ”

"Let's take a look."

The four of them left the greenhouse and walked along the path towards the woods.

Qiqi pulled Yanyan to jump in front of her, Binbin was in the center, and Ding Xuecheng followed behind.

Kiki's exclamation came from afar: "Wow, it's a mountain stream, so quiet!" ”

Bin Bin shook his head and recited the verses: "People are idle and osmanthus flowers fall, and the night is quiet and the spring mountains are empty." The moonrise frightens the mountain birds, and the spring stream sings. ”

Yanyan: "Some of the scene, people, osmanthus, mountain streams, streams; But it's not night, it's not spring, there's no moon, there's no birdsong. ”

Kiki: "Listen! There is a bird call, what kind of bird is it? ”

Binbin: "In the air, it's a lark. The lark is a representative bird of the grassland, belonging to the small songbirds, often singing while flying, because it flies very high, people often only hear its sound, and do not see it. ”

Ding Xuecheng listened to the talk of his friends, so he paid attention to the light curtain. Learning knowledge is one aspect, and he is more concerned with getting points.

The light curtain shakes, and the problem appears: [Problem 4]. The ear is also one of the sensory organs of the human body, what will you find when you listen with your ear? Explain the sense of hearing.

"Beibei, we can hear all kinds of sounds with our ears, such as talking, running water, birds, and we can also use our ears to distinguish the loudness, pitch and timbre of sounds."

"Sound waves act on the auditory organ, the ear, so that its receptor cells are excited and cause impulses from the auditory nerve to cause incoming information, which is caused by the analysis of auditory centers at all levels. Hearing is an important sensory channel second only to vision. It plays a significant role in people's lives. ”

If you answer correctly, you will be rewarded with 15 points; The latter supplement is also correct, it is the acoustic knowledge of the middle and high school stage, and further learning will be carried out in the middle and high school physics classes, and another 50 points will be awarded. ”

The group walked along the path by the mountain stream, and what appeared in front of them was a greenhouse, in front of which there was a small pool, which was full of large and small pebbles, black, yellow, green, gray, white, colorful, and shiny in the sun.

"What beautiful pebbles!" Kiki jumped down first and picked one up.

Yeon-yeon: "Like a bird's egg~!" ”

Kiki: "It's round, it's so smooth to the touch, it's so comfortable!" ”

Binbin: "I have rain flower stones in my flower pots and goldfish bowls, which are similar to these. ”

The light curtain is up again: [Question 5]. How does it feel to touch a pebble with your hand? Explain the sense of touch and summarize what sensory organs the human body has.

Ding Xuecheng: "It feels cold, lubricated, and hard to the touch!" Tactile is a general term for mechanical stimuli such as contact, sliding, and pressure sensation. Most animals have tactile apparatus all over the body, like human skin located on the surface of the human body, relying on the free nerve endings of the epidermis to feel a variety of sensations such as temperature, pain, and touch. The sensory organs of the human body are: eyes, ears, nose, tongue and skin. ”

"Congratulations to Bobo, the answer is completely correct, and 10 points will be awarded respectively, for a total of 30 points."

"Come on, it's Muskaya in the greenhouse!" Kiki made a new discovery and hurriedly greeted everyone.

"It seems to be ripe, can you pick one and eat it?" Bin Bin seemed to have induced his appetite just now, but he didn't eat enough, and asked Ding Xuecheng with his eyes.

"Beibei, do you want points again?"

"5 points apiece."

Ding Xuecheng exclaimed: "Why is it so expensive? ”

"It's good to eat here, and this one is even better." Babe blinked hard.

"Oh~......, I understand! I bought it as if it was delicious! ”

"I've asked Beibei, you can pick one and eat it."

When Binbin heard this, he volunteered to run to the melon field, and said as he ran: "I'll come, and if I only pick one, I will pick the big one and the ripe one." ”

The light curtain flickered, and the problem reappeared: [Question 6]. Together with friends, comprehensively use various sensory organs to observe the melon and select the ripe melon; Taste the melon and say how you feel.

Ding Xuecheng watched the task, called two girls, and gathered around Binbin to see how he chose the melon.

Binbin walked around the melon orchard, observing the color of the melon, sometimes running over to look at the umbilical eye of the melon's big head, and tapping with his fingers, and finally chose a big waxy melon and pinched off the melon vine.

Moved the melon over, Binbin introduced to everyone: "The selection of melons should first look at the color, this kind of melon, waxy yellow is ripe, the most delicious; Look at the top of the melon, the umbilical mark is round and big is a good melon, if the umbilical mark on the top of the melon is very small, it means that the melon has not yet grown, and no matter how big the melon is, it is not sweet; Then press it slightly hard with your fingers to feel slightly softer, but don't feel too soft, otherwise it will be cooked! Tapping lightly with your fingers, a slight trill is ripe, the hard erection is not mature, and the muffled sound is overcooked; You also need to smell the fragrance, generally ripe melons can smell a relatively strong natural aroma here in the big head; Finally, look at the melon, the melon is ripe and falls, and when you pull it with your hand, the rhizome falls off, leaving a round pit, which is a ripe and sweet melon. ”

"Awesome, awesome, awesome!"

"There is so much knowledge in choosing melons?!"

"Well, I've seen it for a long time, and Binbin's knowledge is really extensive!" Ding Xuecheng really admired Binbin, when he was in the countryside, he didn't see his grandmother picking gourds, pumpkins, and cucumbers in the vegetable garden, but he didn't expect to be so exquisite. This time he really praised Binbin, not only Binbin can bring points to himself.

Seeing that Ding Xuecheng was impressed, the little girl was amazed and very satisfied, holding the big melon and shouting: "There are knives on the table just now, let's go back the same way, and wash the melon by the stream by the way." ”

Ding Xuecheng retold the experience of selecting melons in front of the light curtain, and was rewarded again.

"Make full use of sensory organs such as eyes, ears, nose, and hands to select ripe melons, and reward 40 points."

Four friends sat around the dining table, watching Bin Bin peel and cut into pieces, one petal per person.

Kiki and the two boys grabbed it and ate it in large gulps, but Yeon-yeon cut her petal into small pieces and ate them slowly.

Everyone ate the melon and praised it vigorously.

Kiki praised loudly: "It's so fragrant, so sweet!" ”

Ding Xuecheng ate the melon he bought with points, and ate a little slurred: "The fresh melon is really crisp, refreshing, smooth, and juicy!" ”

Bin Bin boasted a little: "The skin is sallow, the flesh is golden, the seeds are full, and they are just ripe!" ”

Yanyan took a small bite of the melon cut into small pieces and said, "I also knocked on it just now, and sure enough, it was as Binbin said, and the watermelon was also like that, right?" ”

Binbin: "Well, almost. The watermelon skin is thicker, and it is useless to press it, mainly to knock and listen to the sound. ”

"Beibei, ripe melon tastes sweet and delicious, smooth and juicy, fragrant, thirst-quenching, and has an endless aftertaste."

"The description of the feeling of tasting the melon is accurate and vivid, clear and clear, I have been whetted by the appetite, it is a pity that I can't eat it...... Bonus 30 points. The event is over and ready to return. ”

The friends left with satisfaction, and Ding Xuecheng was "transmitted" to the classroom space, and he had to accept the reward for completing the task.

Click on the character attributes, and Ding Xuecheng looked down one by one.