Lovely Allergen

The self-heating rice is getting louder and louder. Don't turn your face to Jiang Yufan's mouth when Lezhi, "Why does this have a sound?"

Jiang Yufan shook his head frantically, gesturing to him, "I don't know..."

Hu Xuan in the front seat turned around, raising her hand with a silent expression and drawing a cross on her chest.

But Song Yu seemed to be isolated from the world, without any response, and even half of a mind map had been drawn on the blackboard.Behind him, the whole class laughed and performed a wonderful pantomime. The only accompaniment was the sound of self-heating rice, which was comparable to the increasingly exciting symphony in the golden hall.

Not only that, the experience is still in 4D, with a hot white mist wafting from the drawer of Lezhishi, and the aroma of fish-flavored pork shreds.

I wanted to have a meal secretly, but now it's fine. The whole class, including Song Yu, who leads the class, knows that he is cooking.

Le Zhishi gave up completely. He had already been scolded and ordered out of the classroom in his mind, and then squatted down in the corridor to have a sad meal.

He feels that he is now a very experienced person, and he can answer the question "What is the experience of social death" anonymously.

Finally, after ten long minutes passed, Song Yu turned around blankly and put the half of chalk that was not used up on the table, "This is what I want to say next."

The sound of self-heating rice began to become like a deflated and deflated balloon, and the sound became more and more lingering, just like Lezhishi's head hanging down on the table.

"The first part is to find your weakest link. You all understand the barrel effect." Song Yu said down, but unsurprisingly, he went down the podium.

Rows of students under the stage hurriedly put away their mobile phones, and the student at the front turned to look at Le Zhishi with the mentality of watching a theater.

According to the rumors, the person who bullied his younger brother came to lead the class, so that he was caught stealing food in class. If you don't give a severe lesson, you can't justify it.

"Systematic sorting of wrong questions is an effective way. Making mistakes is not terrible. Everyone will make mistakes. It is terrible that many mistakes will be repeated and eventually lead to loss of points. So what you should do is to reduce the frequency of the same mistake."

In words, he had already walked to the side of Lezhishi, his slender hand seemed to be unwittingly on his desk.

He speaks steadily and logically. From the topic of sorting out wrong questions to the skills of scoring multiple-choice questions in mathematics, such as the combination of figures and substitution methods, Coke Zhishi is an ostrich, except for his own heartbeat. , I can't hear anything.

Song Yu seemed to torture him deliberately, and stood by his side and said that he would not go anywhere.

"...This is the part of multiple-choice questions. Now you practice the multiple-choice skills just mentioned with the questions at hand, for ten minutes." After speaking, Song Yu finally lowered his head and looked at Le Zhishi who had been pretending to be dead. , The bent knuckles tapped the tabletop lightly.

Le Zhishi raised his head pitifully, with an expression that I really knew I was wrong, and honestly took out the self-heating rice box hidden in the drawer.

Song Yu raised his eyebrows in a low voice, "Is it sweet?"

Hearing this sentence, the surrounding students couldn't help but laugh.

"It's okay." Le Zhishi replied very honestly, then added in a low voice, "It's kind of fragrant."

Jiang Yufan is a loyal person. Seeing that Song Yu was embarrassed, he immediately explained to him, "Senior, I bought this. I bought it wrong. Blame me. I can write a review."

Seeing that he was taking responsibility, he immediately spoke when he was happy to know, "No, I want to eat it myself."

Zhang Chen didn't think it was too much of a lively event, "Senior, I can prove that it was eaten when Lezhi. They had been sneaking in for a long time before, and they just wanted to eat self-heated rice during the evening study.

Jiang Yufan was very angry, "Are you qualified to say it? It's as if you haven't eaten takeaways during your own study. And he didn't plan to eat in the classroom."

The two quarreled, Song Yu's eyes swept over the students who were laughing, everyone seemed to be full of expectations for his punishment, and finally, he spoke blankly.

"Take this opportunity to tell everyone the principle of self-heating rice."

Zhang Chen's face was unbelievable, which was completely different from the direction he wanted to file a penalty complaint against Sanlian.

Ignoring the whispers of the surrounding students, Song Yu picked up the lunch box on the desk and said, "Look here."

"The bottom layer of the self-heating rice box contains a heating package, which contains chemical agents such as quicklime, sodium carbonate, and aluminum-magnesium mixture. Quicklime is calcium oxide. It reacts with water to form calcium hydroxide and releases a lot of heat. Carbonic acid Sodium often plays an auxiliary role in it, and aluminum-magnesium powder can also release heat through oxidation. So when we inject water, the heating pack will work to automatically heat the food."

He lowered his head and met Lezhishi's surprised eyes, and continued: "However, this kind of self-heating fast food may also explode, and the freshness of the food is not enough. It is not recommended to eat regularly."

After finishing speaking, Song Yu put down the lunch box and pointed back to the blackboard, "I have written several related reaction equations in the lower right corner of the blackboard, and interested students can take a look."

Lezhishi looked at the equation on the blackboard.It turned out that at that time he already knew what had happened, and he wrote it calmly.

At first, everyone just thought it was funny and wanted to see the excitement, but I didn't expect the mutation chemistry class of the social death incident, and it was a bit embarrassing.The magic is that part of it reflects that they have learned it before, but they have never connected to life. Such a comparison, it feels magical.

"Combining with the example just now," Song Yu leaned at Lezhishi's desk, "you should never forget that calcium oxide is an exothermic reaction when it meets water."

Everyone laughed at the same time, but Zhang Chen was obviously still unwilling. He raised his hand with a stern expression on his face, "Senior, then why is there a sound? It's too funny."

This is obviously to bring everyone's attention back to the time when the self-heated rice was sneered.

Song Yu leaned at the table and did not answer directly, but looked at other students, "You should have done chemistry experiments. Can anyone tell me which chemistry experiments you have done have special sounds?"

A girl whispered, "Sodium and water..."

Song Yu nodded to her affirmatively, "This example is very classic, and many chemical reactions make noises." He deliberately glanced at Zhang Chen, who had deliberately asked the question earlier, "Nothing to fuss about."

Zhang Chen couldn't hold her face quickly, and obviously felt a trace of sarcasm in the other's cold tone.

"Except for the reaction itself, a large amount of water vapor will be generated during the exothermic process, and sound will also be produced under collision. This process contains many reactions like galvanic batteries, which you have not learned so far."

Song Yu lowered his head and glanced at him, "I believe... if Le Zhishi's classmates knew the principle behind this from the beginning, they would not choose to heat self-heating rice in a quiet environment."

Le Zhishi classmate.

This title sounds strange when Lezhi, but somehow it evokes a hint of joy.

Although Song Yu still had a cold expression, it didn't mean to blame.The clear sentences are to popularize chemistry knowledge, but everyone can hear the hidden excuses.

Le Zhishi thought that the bottom line of his anonymous answer can now be updated in real time with the sentence "I live again!" No, he can even cancel anonymity.

As he was stunned, a broad palm fell on his head, rubbing his fluffy and soft hair, very short and light.He didn't react, he only felt the hand leave the top of his head, but left a word.

"If you don't eat it, it will be cold."

The killing came suddenly, and the students around were a little surprised.

The so-called rumors of poor brotherhood were self-defeating under Song Yu's extremely rare close contact.

Lezhi didn't lift his head, "I'll go out to eat."

After he finished speaking, he took the lunch box and walked out, kind of on the same hand.

The bathroom was on the right side of the stairs, next to the bathroom, and when Lezhi saw no one, he slipped in.The taste of convenience food is ordinary, the rice is hard, and the dishes are a bit too salty.

He chewed and was in a daze. After swallowing, he raised his hand fascinatedly, touched the top of his head, bowed his head and took another big mouthful.

I didn't feel hungry until I was hungry. What happened just now happened again. I couldn't eat well when I knew it. I was worried about what Jiang Yufan said he wanted to taste.But the little Jiang Yufan has experienced too much, can't remember anything, waited for five minutes and didn't come.

Song Yu is still in the class. Lezhishi didn't want the ink to be too long, so he cleaned up and returned to the classroom.When he arrived at the door, Song Yu was standing on the podium speaking the English review plan. He stood at the door and shouted a report softly, but did not enter directly.

Hearing the sound, Song Yu nodded to him, and then continued speaking if nothing happened.

Le Zhishi quietly returned to the position and listened to the lecture with other students.After the entire class, Song Yu, who did not bring any materials, only spent ten minutes sorting out the context of the mind map, and then led everyone through it with clear thoughts, even beyond many teachers.

"Time is limited, so let's talk about it." Song Yu stood sideways, looked down at his watch, and was about to study in the first night.

"Lezhishi."

Hearing his name was called, Lezhi was stunned for a moment, and quickly raised his head to look at his brother.

Song Yu clicked his chin toward the blackboard, "wipe the blackboard."

Le Zhishi immediately nodded obediently, "Hmm." He said that he was about to stand up.

Since childhood, when Le Zhishi was afraid of Song Yu’s ignorance, especially after he did something wrong, if Song Yu taught him a lesson, or gave him something similar to punishment, it would mean that he was not angry. .

Song Yu couldn't speak when he was really angry.

They all know each other enough.

"Don't wipe it," the girl taking notes looked up. She didn't listen to much during the explanation before. Now she rushed to copy the blackboard, "I haven't finished copying yet." Other people also followed, Le Zhishi was in a dilemma.

Song Yu glanced faintly, "Since the phones you bring can chat, you should also be able to take pictures."

Everyone was choked by this sentence, especially those who were still chatting gossip and watching jokes in the group just now.

The school bell rang and Song Yu left the classroom.Le Zhishi wiped the blackboard as he said. Jiang Yufan spoke of loyalty and took another blackboard eraser to accompany him, "Is that delicious meal?"

"It's okay." Lezhishi looked at him, "I waited for you for five minutes, and you didn't go."

"You've been waiting for me for a long time. I said why it took so long. I forgot." Jiang Yufan rolled up his sleeves, "Zhang Chen's stupid fork still stuns you, asking if you are too embarrassed to come back, and you are so angry. If I can't chase, I will vent my anger at others."

Lezhishi waved his arms and worked hard to wipe the blackboard. He didn't care much about what he said when he was away. "He also has the mouth addiction for the past two days. If the person I like likes others, I am definitely not happy. "The hand holding the eraser suddenly stopped, and Lezhishi's gaze stayed on the lines of equations in the corner.

This was the last unfinished task in the clearing task that Song Yu assigned to him.

"Is your phone on you?" He turned his head to look at Jiang Yufan who was photographing dust.

"Yeah, what's the matter." Jiang Yufan took it out and handed it to him, "You only remembered to shoot now, it's all gone."

Le Zhishi didn't speak, and used his mobile phone to take pictures of the equations in the lower right corner.

"Thank you, send me this."