The happiest thing about math class is that you can brush up on math questions without distractions, and there will be no distractions or worries!

Li Dan only took more than 30 minutes to finish a set of mathematics college entrance examination questions, and before he had time to savor the aftertaste, the bell rang after class.

The third class is chemistry.

Chemistry teacher Wang Jianguo is a Shaanxi man who is about to retire, and he can't find any other faults except that his Mandarin is not very standard.

Especially his own affinity, it's simply overwhelming!

Although he is close to the age of six, Wang Jianguo is particularly passionate in the classroom, and is good at kneading all kinds of interesting jokes into classroom knowledge to teach.

Therefore, chemistry class can be said to be the favorite class of the whole class!

Not one of them!

As a senior scumbag, Li Dan will also widen his eyes and listen attentively in chemistry class.

The difference is that ordinary students will memorize chemistry knowledge in their minds through this entertaining and educational way.

And Li Dan remembered all those funny jokes in the Shaanxi dialect, and he didn't remember any chemical knowledge!

As for Da Chun, chemistry class was the only one he couldn't sleep in all the classes!

It's his nightmare!

Because the whole class was simply too joyful, too noisy.

Especially Li Dan beside him, listening to the lecture while listening to the silly music of "hey, hey, hey" in his ears, there is no sleeping environment at all!

"Kids! Kids! Babies! ”

This is the classic opening remark of chemistry teacher Wang Jianguo before the official start of each class.

After the whole class was creepy and goosebumps fell all over the ground, Wang Jianguo squinted his small eyes, grinned a big mouth, and looked kind like a big fat man of 200 pounds.

In fact, he was terribly thin.

Nearly 1.8 meters tall, but weighing less than 100 pounds, walked like a bamboo pole carrying a big lantern, swaying, as if a gust of wind would blow down.

Li Dan also likes to sway when he walks on weekdays, and most of them are imperceptibly influenced by Wang Jianguo.

"Children, everyone who has studied chemistry knows that there are many chemical substances that are very stable, resistant to high temperatures, resistant to acid and alkali corrosion, and resistant to oxidation."

Wang Jianguo was happy, and a mischievous smile suddenly flashed in his eyes: "Hehe, stable is like some people's achievements, and it can't make any waves at all!" ”

The whole class continued to look at Wang Jianguo with interest, knowing that he would definitely have follow-up questions, this was already an old routine.

However, it has been more than two years, and instead of dissipating interest, everyone is eating more and more of him!

Especially in the period when the college entrance examination is approaching, teachers in almost every subject will consciously or unconsciously put pressure on students in class.

The string in everyone's head is getting tighter and tighter, and it's about to break!

It is only in the chemistry class that everyone can find a sense of relaxation and experience the fun of learning itself.

Wang Jianguo continued to say with a smile: "However, no matter how stable the substance is, once a catalyst is added, a magical chemical reaction will occur!" So, can any of you make a simple inventory of the catalysts we learned in the three years of high school? ”

When even a very well-behaved girl stood up and was about to answer, she was beckoned to the podium by Wang Jianguo and handed her a piece of chalk.

The girl hesitated, then blushed and began to write the chemical formulas of various catalysts in front of the blackboard.

Manganese dioxide, magnesium oxide, iron oxide, copper oxide, potassium permanganate......

After a period of searching, the girl finally wrote all the catalysts she could think of on the blackboard, then turned around and looked at Wang Jianguo with a pleading gaze.

"Okay, Cai Linlin's writing on the blackboard is relatively complete, and she basically lists the most common catalysts."

Wang Jianguo smiled slightly, looked at the students under the podium and continued: "Now, who can write down all the chemical reactions related to these catalysts? ”

The difficulty of this question has suddenly increased to a big notch, and everyone looks a little hesitant to look at me, I look at you.

At this time, Chen Xiaoxu, the representative of the chemistry class, slowly stood up.

What does a chemistry class representative do? Isn't it to save the teacher at a critical moment?

Chen Xiaoxu walked onto the podium calmly and confidently, took the chalk in Wang Jianguo's hand, and began to write the blackboard.

In a short time, more than ten chemical reaction formulas were written.

Wang Jianguo nodded secretly while watching from the side, and after Chen Xiaoxu finished writing all the chemical reaction formulas, he returned to the podium.

"So here's the problem! Who can count in the shortest amount of time how many different chemicals are contained in these chemical reactions, and how many different chemical reactions can be produced between these chemicals? ”

Wang Jianguo raised his wrist and looked at the time on his watch, and then stretched out a finger: "I'll give you 10 minutes, as long as any student can say the correct answer during this time except for Chen Min, I will tell you a joke I have learned the most." ”

Chen Min, a member of the study committee, shrugged his shoulders helplessly, continued to bury his head in the "Science Fiction World" magazine on his desk, and immersed himself in science fiction novels full of whimsy and high technology.

At this moment, she has been deeply shocked by Liu Cixin's "The Wandering Earth".

It's just a short science fiction novel of tens of thousands of words, but it creates the feeling of a grand science fiction masterpiece full of imagination and plot tension.

Every sentence, every word, and even every punctuation mark in the novel is worth savoring when reading, and it is simply addictive to it.

Especially when we see the thousands of Earth Guardians who stood to the end being forcibly stripped of their protective clothing by millions of ignorant rebels, frozen to death in the extreme cold of the night, and turned into thousands of standing flags.

Chen Min felt that his heart was rubbed violently, and he couldn't help but sigh secretly in the depths of his heart.

"The truth is often in the hands of a few...... But the minority has to obey the majority...... In the end, is the truth still in the hands of the majority......

"Mr. Wang, these chemical reactions on the blackboard contain a total of 42 different chemical substances, and a total of 1,247 different chemical reactions can be produced between these chemical substances. Is this answer correct? ”

A voice suddenly sounded from the back of the classroom, and it was particularly abrupt.

The classmates turned around one after another, and saw Li Dan standing on the seat with a smile, with a pair of small slitted eyes that looked extraordinarily focused.