Li Dan was stunned instantly, he didn't expect that the so-called master-servant relationship between Da Chun and Lin Xian'er was really there.

And, not just the two of them, but both of them for generations!

Since it has already involved the privacy of other people's families, Li Dan feels that his curiosity must be stopped.

Because there are some things that are not enough for outsiders.

Once it leaks out, it will cause irreparable disasters to both sides.

"Hmm...... Xian'er, I'm just curious, something like this, you don't need to tell me about it......"

Lin Xian'er smiled slightly and said, "Dandan, don't worry." What I tell you, you can know. ”

Li Dan smiled awkwardly, and after making it seem like he was a little childish for a long time.

Come on, let's take a look at the two books I borrowed from the library to ease my current awkward situation......

Li Dan sat at the dining table, casually took out "Mathematical Principles of Natural Philosophy" and "Introduction to Calculus and Mathematical Analysis" from his schoolbag, and quickly integrated his whole body and mind into it.

Lin Xian'er looked at Li Dan's concentration on reading and did not seem to be fake, she was slightly surprised, and after observing for a while, she turned around and returned to the study on the second floor.

Since Li Dan didn't take the initiative to let her help with science comprehensive, there was no need for her to do more.

And Lin Xian'er knew that if Li Dan could really understand the two books he borrowed from the library, then there would be no problem with high school physics in the first place.

As for the two courses of chemistry and biology, they mainly rely on the foundation of daily learning, and she has sorted out some key knowledge points to Li Dan the night before.

Tonight, as long as Li Dan is left enough time to review and sort out again.

Li Dan opened his bow left and right and looked at the two books for a while, then simply took out the high school physics single subject review materials from his schoolbag, and began to read these three books at the same time.

The knowledge points and practice questions on the review materials that were like books from heaven have suddenly become clear and thorough, no matter how complex the mechanical analysis questions are, under the mathematical analysis method of calculus, they have instantly become like pediatrics.

Li Dan has done seven or eight questions in a row with the highest error rate in the physics test paper over the years, and he feels like a full-level hero in a god costume in the Glory of Kings PK with the hero who goes out at the first level on the opposite side, it's not too easy!

One knife for a child!

Another knife is another child!

Whew – the physics part of the exam shouldn't be too problematic!

Li Dan then took out the thickest review material from his schoolbag, which was the "Compilation of Comprehensive Knowledge Points and Exercises for Science in the College Entrance Examination".

This book not only includes all the knowledge points in the physics, chemistry, and biology textbooks of the three years of high school, but also brings together the original questions of the college entrance examination in the last five years, as well as a large number of mock exercises.

Looking at this new book, which is almost 95 percent, Li Dan himself is a little embarrassed.

Since the beginning of the third year of high school, Li Dan has been pressing this book thicker than a dictionary in the deepest part of the drawer, not only the outer cover has no obvious wear and scratches, but the pages inside are brand new, except for a little yellowing, there is not even a little curl and folding!

"It's barely worth it to read such a book with a precious reading card."

Li Dan selected the green reading card in his mind from the "Compilation of Comprehensive Knowledge Points and Exercises for Science in the College Entrance Examination" on the desktop, and then clicked to use it.

In an instant, Li Dan felt as if his brain was about to crack open in an instant, and a heart-piercing pain swept through his entire mind, and countless knowledge points, information flows, and exercises all rushed into his brain.

It's like my brain has turned into a big iron pot, and all the messy ingredients are stuffed into the pot in no particular order!

Fortunately, this large iron pot was large enough, and although the large number of ingredients that suddenly poured in was huge and varied, it did not overflow from the pot.

At this moment, the slightly rudimentary tree of knowledge in Li Dan's mind suddenly stretched out its huge roots and inserted them into the ingredients in the big iron pot like countless dense straws.

Gradually, the ingredients in the big iron pot disappeared at a speed visible to the naked eye, and all of them turned into a variety of nutrients, which were transmitted to the branches and forks of the tree through the rhizomes of the tree of knowledge.

Suddenly a miracle happened.

The tree of knowledge, which was originally bare, with only one trunk and a few pitiful branches, trembled violently, and a majestic force suddenly broke through the bark, and three thick branches extended from the main trunk, closely surrounding the main trunk with a three-legged momentum, proudly pointing to the sky.

Although these three thick branches of the knowledge tree are of the same origin, they are very different from each other.

One of the branches was slightly thicker than the other two, and the bark shimmered with a pale blue halo and was densely covered with dotted lines, like a vast cosmic star map.

The other two shimmer light green and purple, respectively.

The tender green one is full of vitality and exudes a strong breath of life.

The blue-purple one is full of change and mystery, and seems to contain all the secrets of cause and effect between the elements.

"Light blue represents physics, while baby green represents biology, and blue purple represents chemistry......

Li Dan closed his eyes slightly, and was engrossed in feeling the incomparably wonderful tree of knowledge in his brain, and the whole person seemed to have entered an incomparably mysterious state.

Is this the charm of knowledge...... It's just amazing......"

Li Dan has always hated exam-oriented education.

Therefore, everything related to exam-oriented education is a source of pain for him.

It was only at this moment that Li Dan finally realized the charm of these subjects he learned in high school.

In particular, the close and interdependent relationship between physics, biology, chemistry and mathematics is simply the top logical aesthetics in the world!

This top-notch beauty brings people comfort and refreshment, and completely crushes the coolness brought by electronic products!

"Read more, read good books, read good ......"

"There is a golden house in the book, and there is Yan Ruyu in the book......"

"If you don't read for a day, you will be born in the dust; I didn't read for two days, and my speech was boring; If you don't read for three days, your face is hateful. ”

It's no wonder that since ancient times, so many nerds have buried themselves in stacks of books all their lives, and regarded reading as the best enjoyment!

"Alas-I really envy Da Chun, and Lin Xian'er! There are so many good books to read in my own study......"

Li Dan shook his head and sighed: "However, Da Chun, this poor worm! Being in the midst of blessing and not knowing blessings, passing through Baoshan without entering, is simply a waste of resources......"

Li Dan was about to continue to bury his head in reading, but the walls around him suddenly flickered, and there was a shrill siren in his ears.

"Didi! Tick Tick! Tick Tick! ……”

Li Dan was stunned!

What the hell is going on?!

How did you make it look like Resident Evil in the villa room?!