"Senior sister, is this another chemistry class?"

A cute girl in a blue and white school uniform ran in front of Wu Dan.

"Senior sister?"

Wu Dan glanced down at her clothes and pants, and was speechless in shock, she was actually wearing the school uniform of Dongfeng Private Middle School.

The staircase suddenly became crowded, and she was surrounded by students.

"Senior sister, the fourth class of high school is also doing experiments in the laboratory."

"So what, that nasty isn't there anymore anyway......"

A tall boy behind Wu Dan walked to the front and looked at the boys with cigarettes in the corridor with disdain: "Is it the freshman in the first year of high school who has floated, or are we unable to hold the knife?" ”

He was not wearing a school uniform, his hair was dyed golden, and a scorpion was tattooed on his arm, and he gently dragged Wu Dan's right hand: "Sister Yan, please." ”

The first-year high school students saw the tattooed man opening the way for Wu Dan and took the initiative to make a way for the students of the first-year high school class.

"Sister Yan? What the hell ......"

"Do they think I'm Ma Yan?"

Wu Thant was completely in a state of confusion, and before she knew it, she had melted into the nightmare of Dongfeng Private Middle School.

Seeing Wu Dan's distraction, the tattooed man took the initiative to put his arm around her shoulders and went in front together, followed by a small group of students, all of whom seemed to be in the first class of high school.

"Wait!"

When they walked to the classroom of the fifth class of high school, more than a dozen boys in black short-sleeved shirts each had a broom stick in front of them.

The boy at the head was aggressive, holding a stick in his hand, and looked at the tattooed man viciously: "Zhao Chao, this is the third floor, I advise you not to put up a shelf in our first year of high school, you are arrogant." ”

The corners of Zhao Chao's mouth rose slightly, with a playful smile on his face, and he walked up to him casually and glanced at them with disdain.

"Smack!"

Zhao Chao didn't want to talk more, so he directly waved his hand and slapped him in the face.

"Brother Yang!"

The group of students behind him were excited, clenching their sticks and ready to move.

"Don't ......"

He stopped the group of students behind him and glanced at Zhao Chao coldly: "What's special!" Zhao Chao, there are only so few people left in your junior class, and you dare to be so arrogant? ”

This student, who is called "Brother Yang", talked about Zhao Chao's sore spot, and he was about to "teach a lesson" to the group of hairy boys in the fifth class of high school, but the director of the third grade of high school came.

"What are you doing?"

Wu Dan learned from Su Daoqin's memory that the director of the third grade of high school was called Zhao Fu, and he was also the head teacher of the first class of high school.

Zhao Fu is very strict, but he is very good to the students, he has a serious face in class, and he calls the students brothers and sisters after class, and the students are very convinced.

The group of students in the fifth class of the first year of high school also knew how to play tricks, and as soon as they saw Zhao Fu coming, they hurriedly hid in the classroom.

Zhao ...... Teacher. ”

Wu Dan almost shouted the words "Zhao Fu" directly.

"Hmm."

Zhao Fu sighed, looking like he hated iron but not steel: "Zhao Chao, the school has not been peaceful recently, first the students in the fourth class of the second year of high school collectively jumped off the building to commit suicide, and then a large number of students in our class ran to the top floor to commit suicide, in this period, you must not take the lead in causing trouble for me!" ”

"Teacher Zhao! These stinky boys just owe a beating! ”

Zhao Fu waved his hand, "Okay, you go to the laboratory for class, today you will join the second and fourth classes of high school."

"Remember, don't get me in trouble! If you do something during this period, just wait for the withdrawal notice! ”

After Zhao Fu finished speaking, he hurriedly entered the principal's office.

"Sister Yan, don't worry, the 'toad' in the fourth class of the second year of high school is no longer there, let's go to the laboratory."

Zhao Chao grabbed Wu Dan's hand very gentlemanly and didn't let go until he walked into the laboratory.

There were only four or five girls left in the fourth class of the second year of high school, and Su Daoqin stood on the podium.

"Su ...... Daoqin. ”

Seeing that he couldn't control his excitement at all, Wu Dan directly called out his full name.

The students behind Wu Thant couldn't believe their ears, staring at Wu Thant in a daze, speechless.

"Ma Yan, what did you just call me?"

Su Daoqin stared at Wu Dan in disbelief, he really couldn't believe that Ma Yan would talk to him in such a tone.

Wu Dan suddenly came back to his senses: "Oh, Mr. Su, I'm sorry, I ......"

Su Daoqin's impression of Ma Yan was not bad, and he didn't ignore it: "Okay, students in the first class of high school, you can choose a position by yourself." ”

Zhao Chao glanced at Wu Dan in surprise and took her to the corner to choose a place.

The remaining dozen or so students in the first class of the third year of high school chose a few positions at random.

"Students, the experiment we did today is very simple, the purpose of this experiment is to understand some characteristics of concentrated sulfuric acid."

"The instruments we used in this experiment are: tray balance, beaker, graduated cylinder, thermostat, alcohol lamp, glass rod ......"

Su Daoqin couldn't understand what Wu Dan said at all, her attention was all focused on the book in Su Daoqin's hand, and Wu Dan always felt as if she had seen it somewhere.

"Does anyone know how this experiment works?"

The four or five students in the fourth class of the second year of high school should have done a preview in advance, and they raised their hands in unison, and the students in the first class of the third year of high school were in a fog and at a loss.

"Ma Yan."

"Tell me about the principle of this experiment."

Wu Dan was blank for chemistry, she held back for a long time, and finally slowly opened her mouth: "Teacher, I, I don't know ......"

"What? Ma Yan didn't even know such a simple experimental principle? Isn't she the first in her grade? ”

"It turns out that this is the 'good student' in the teacher's mind......"

"No, Xueba shouldn't have overturned on such a simple issue!"

The students present were all surprised, and they all stared at Wu Thant.

"Look at what! Who hasn't made a mistake yet?! Zhao Chao yelled in front of Su Daoqin, and no one dared to speak out again.

"Ahem...... Cough. ”

Su Daoqin was a little embarrassed: "Be quiet." ”

"The heat of dissolution of pure concentrated sulfuric acid is 43.6 kilojoules at 20 degrees Celsius, so there is a large amount of heat release when mixed with water......"

Su Daoqin patiently explained on the podium and said a lot, but Wu Dan didn't understand a word.

Halfway through the conversation, Su Daoqin received a phone call, "Okay, let's do the experiment by ourselves, pay attention to safety." Zhao Chao, you and Ma Yan take care of discipline. ”

After giving the order, he hurried out of the classroom.

"Experimenting?"

Wu Dan suddenly remembered the "accident in the laboratory", Ma Yan was in the laboratory, if he continued to develop according to this trend, Wu Dan would definitely have an accident.

Wu Dan quickly searched her mind for what happened to Ma Yan in the laboratory, but every time she thought of the most critical moment, her head was in sharp pain.

"That ghost trapped me in the nightmare of Dongfeng Private Middle School, and he wanted to kill me in the same way......"

Knowing that tragedy would happen, U Thant could not stop it......