It's the big guy again.

Ling An was rarely attracted to attention.

Hua Ji, this kid, has something to do with his own family, and his father and his father have been friends since childhood. The two families are also familiar with each other, and the relationship between Huaji and the three siblings of the Ling family is similar to that of brothers.

It was only later that Huaji's father joined the army......

He is a few months younger than Ling An, because Ling An is the second oldest in the family, so Hua Ji is used to calling him the second brother.

"Huaji!"

Hua Ji felt that the voice in the classroom suddenly became quiet, and his heart trembled, and he looked up to see Teacher Chen, who was lecturing, staring at him with a frown.

This kid, ask for more blessings. Ling An shook his head secretly.

"Huaji, what did you just say down there?"

Teacher Chen was a little unhappy, and what she was talking about now was all about the point.

This little fat man himself is still very clear, smart, but he loves to desert, this is not the first time, Mr. Chen decided to teach him a lesson.

"Forehead ......"

Hua Ji touched his head and was about to make up a reason, but he saw Teacher Chen's face change on the stage.

What's wrong?

Hua Ji was a little confused, and subconsciously looked at Ling An beside him, but found that the second brother looked back, and his expression was a little surprised.

Could it be ......

Ling An had an ominous premonition in his heart.

Anyway, everyone looks back, and if you look back yourself, there's no problem.

This time, Hua Ji almost fainted with fright.

Ling An was also very surprised.

Because there was a slight movement in the back door just now, Ling An, who didn't care about it, was also curious because of the change in Teacher Chen's expression and turned his head to look over.

The back door was open, and the principal, who had always liked to stand in the C position, was now next to a middle-aged man who was smiling and had a gentle expression, and looked like he was about fifty years old.

The middle-aged man was dressed plainly, but there were already exclamations from someone in the classroom.

Earth Federation, Asia Defense Chief, Zhou Yang.

The legendary S-class warrior has fought bloodily on the Martian battlefield for more than 30 years, and has repeatedly performed miraculous feats, until the last two years, because of his age and the new S-class soldier taking over, he returned to Earth from the front line and became the chief of defense of Asia.

Such a legendary figure will appear here!

By the way, President Zhou Yang's high school alma mater is Yuanyang No. 1 Middle School! No wonder he's here.

This is indeed a big shot, but this kid Huaji ......

Look at Huaji, he is already pale at this moment.

No, why am I carrying it so much, and I was caught deserting when Chief Zhou Yang came to inspect...... At this moment, Hua Ji's expression was as if he had eaten Coptis chinensis. He seemed to have seen that the principal would call him to the office alone after class, and then ......

Hiss! It can't be like this!

Huaji, this kid is indeed smart, and as soon as his eyes rolled, he thought of an idea.

At this moment, everyone was still in the excitement and surprise brought by Chief Zhou Yang, and Hua Ji suddenly said calmly:

"Teacher Chen, I was thinking about the connection between the discovery of G matter and the human race entering the fortress era just now, and there were some things that I didn't understand, so I couldn't help but ask Ling An."

"I'm sorry for the delay, I'll write a review." After speaking, Hua Ji also bowed to the teacher, and looked at Teacher Chen stunned.

And Ling An didn't expect that this kid from Huaji would make a move! Seeing Hua Ji wink at himself as he hooked down, the corners of Ling An's mouth twitched slightly.

With what he knows about Mr. Chen......

"That's it, it's okay, the teacher forgive you." Teacher Chen also relieved himself from the arrival of President Zhou Yang, and saw that the principal secretly gave him a gesture to continue the class, and heard Huaji, the little fat man, say this, and bowed his head slightly at the moment to express his forgiveness.

"That's right," Mr. Chen said. "This test point is really important, Ling An, why don't you get up and answer it. Huaji, you can sit down. ”

Really...... Ling An sighed in his heart.

Feeling that the eyes of his classmates fell on him, Ling An couldn't see behind him, but Chief Zhou Yang and the principal must have also looked at him.

However, Ling An was not too nervous, history was his specialty, and he had reviewed this section of knowledge last night.

After organizing the language, Ling An said calmly:

"The discovery and application of G matter was of great significance for the beginning of the Age of the Fortress. First of all, from the point of view of the time node......"

While Ling An narrated, he subconsciously reviewed this period of history in his mind:

In 2050, Chinese scientist Feng Zixuan discovered substance G.

This is an extremely mysterious substance, which occupies a huge proportion of the universe, not only in space, but even in living beings, and contains huge energy. The scientific community speculated that it was a type of dark matter, and after intense discussion, it was finally named G matter.

With the use of G matter, human beings have successively solved the energy problem, the material problem, and even made a major breakthrough in the field of biology.

At the same time, during the investigation of the cult organization, the Fallen God Society, the relevant departments intercepted the information that "within 50 years, the abyss is about to descend on Mars, and the servants of God will cross the galaxy and come to the earth to help the fallen god be reborn and turn the earth into a new paradise."

The official secretly sent personnel, set up a special organization, and in the confrontation with the Fallen God Society, he came into contact with the three alien races as the vanguard for the first time.

In the end, after paying a terrible price, the three alien races were exterminated, and the strength of the Fallen God Society was greatly weakened, but unfortunately, the Fallen God Society was not able to complete the clearance, and the Fallen God Society hid and still existed until today in 2183.

At this time, with the help of the technological revolution brought about by G matter, human beings have the ability to sail on a large scale in the solar system, so they organized personnel to go to Mars for exploration, and sure enough, they found that there was a huge space fluctuation anomaly near the North Pole of Mars.

The oracle of the Fallen God Society is not fabricated out of thin air, plus the three alien pioneers encountered before, after studying their corpses, it was found that they are not the same species as humans at all, combined with the information obtained from the Fallen God Society, the top leaders of various countries believe that there are about to appear alien races on Mars, and the invasion of the earth is likely to be true.

Next, with the strong efforts of the country led by Huaxia, the fortress plan was launched.

All the nations of the planet are united, the United Nations is upgraded to the Earth Federation, and the member states work together to resist alien aggression while maintaining their independence. With the issuance of a unified federal coin, the technical barriers between countries were actively broken, and mankind began to develop rapidly.

And all this is inseparable from the application of G substance, which solves the differences between various countries due to energy problems.

The highlight of the Bastion project is the construction of a massive launch tower on Mars, which will create an inner shield that uses G matter and the Martian magnetic field to envelop the entire Mars, and this launch tower is known as the "Tower of the Week" after the organization that first made great sacrifices to defeat the Fallen Gods.

In order to protect this tower, humans also need to build a huge fortress, which needs a lot of defense to defend it.

Thus, over the next 30 years, humanity came together to establish the January route from Earth to Mars, and then near the South Pole of Mars, to establish the greatest city of wonder ever built: the fortress of man.

With the help of G matter, mankind has successively completed the construction of the Zhoutian shield launch tower, and has made a breakthrough in biotechnology, so that soldiers who have received special reinforcements can adapt to the Martian environment.

Later, the invention of the "engine" that could further strengthen human warriors with G matter doubled the confidence of human beings to resist aggression. Three successive groups of armed soldiers, a total of 900,000 people, carried engines and received relevant training, and became the first guards of the human fortress, and they were the first members of the Glorious Army.

At that time, it was 2095, the prophesied abyss had not yet opened, and some countries had complaints, but the Earth Federation still decided to strengthen its defenses, in addition to continuing to manufacture systems and increase the size of the Glorious Army, it also built a large number of war resource production facilities, increased a large number of machine troops, established missile systems and air strike systems on Mars, and established defense lines in the area outside the human fortress.

Just as the end of 2099 was about to usher in the New Year, some countries began to question whether there was really an alien race, and the Earth Federation was mired in disputes, and even the human fortress was affected and chaotic.

The abyss opens.

Alien descended, these creatures have unimaginable and strange powers, their intelligence is not inferior to that of humans, but they have not developed technology comparable to humans, but rely on their own great strength and numbers, and in a short period of time, they have destroyed almost all the defenses on Mars except for human fortresses.

Fortunately, the passage doesn't seem to be fully opened, and the speed at which the alien race descends gives humanity a chance.

With the help of the previously established G material nuclear weapon strike system, after paying great sacrifices, humanity successfully destroyed that group of pioneers and won a precious respite.

It was also this large-scale use of G-matter nuclear weapons to strike, which made mankind even more frightened to discover that even the most advanced and lethal G-matter nuclear weapons could not kill many of the alien beings.

But in any case, this nuclear strike also made the alien race that had not yet assembled give up continuing the large-scale attack, and the alien race did not occupy the defense line outside the human fortress, but retreated to the abyss, that is, the passage to the north pole of Mars.

The Earth Federation quickly used the war resources it had accumulated over the years to fill the gaps in the defense of the human fortress, perhaps because of the strength of the alien race, which gave all humans a sense of crisis, the Federation almost overdrew the economy of the entire Federation, not only restored the previous defense force, but also expanded the size of the Glorious Army to 3 million.

In the time that followed, they continued to resist the invasion of the alien race. It is only in recent years that an advantage has been achieved.

Marked by the war against foreign invasion between 2099 and 2100, the Fortress Age began, which continues to this day.

And everything in it, whether it is the January Channel, the construction of the Zhou Tian Tower, the solution of the energy problem, or the invention of the "engine", is inseparable from G matter.

It can be said that without the discovery and application of G matter, there would be no human beings today.

Because of this, Dr. Feng Zixuan, who discovered G substance, is also listed as one of the ten most influential people after the steam age.

“…… The relationship between G matter and the age of the fortress, I know roughly these points. ”

Of course, Ling An won't finish it all, he just explained the part that was used as the test point.

The classmates around him all cast admiring glances at him, and Ling An summed it up extremely well, and there were many things that were not mentioned in the book.

Even Chief Zhou Yang and the principal, who were listening to the class in the back, smiled at this moment and kept nodding.

"Ling An, you answered very well, please sit down. But you should pay attention to one point, when writing on the answer sheet, you don't need to be so detailed, just briefly summarize those points. Teacher Chen was also very satisfied, with a smile in his eyes.

As soon as Ling An sat down, Hua Ji next to him cast an admiring look at him, but at this moment, Chief Zhou Yang and the principal were still behind, and he didn't dare to speak.

"Okay, let's continue to look at this one test center......"

After class, the squad leader Su Man went out and trotted back, she came to Ling An's table, and said to him with a slightly red face:

"Classmate Ling An, Teacher Chen told you to go to her office."

Ling An was stunned for a moment, looked at Huaji, who was also a little confused, and put down the mock test paper in his hand.

"I see, thank you, squad leader."

Looking at Ling An's departing back, squad leader Su Man swallowed his saliva. And all this was seen by the little fat man Huaji, and he couldn't stop snickering in his heart.

"Report!"

As soon as he entered the office, Ling An couldn't help but be surprised when he saw the figure sitting opposite Teacher Chen.

Chief Zhou Yang?!