"Ding~~"

"Congratulations to the host, the chemistry has been upgraded to lv1, the overall evaluation is s-, and an additional random lottery opportunity will be awarded. I hope the host will continue to work hard!"

The cold sound of metal machinery sounded, and Liu Yichen's fatigue from the day was swept away, and surprise filled his eyes.

"Sure enough, there are extra rewards for upgrading. It's worth it. I ran five kilometers in the morning and focused all my attention on chemistry!" Liu Yichen clenched his fists.

During the National Day holiday, everyone else entered the carnival, but this did not include Liu Yichen. He ran to school at six in the morning. The school gate did not open until 7 o'clock. Liu Yichen simply ran around the school in the morning and ran five kilometers, and then

I focused all my attention on chemistry, worked hard, and finally finished reading all the chemistry textbooks at eight o'clock in the evening.

"God rewards those who work hard, and the emperor will pay off the hard work!" Liu Yichen felt that he was full of motivation now, put his things in his backpack, and left the library with the backpack.

"System, give me a lottery!" Liu Yichen roared in a low voice.

He was so excited and looked forward to getting something good this time.

Immediately, Liu Yichen saw a lottery disc appear on the system interface. The disc rotated rapidly. Liu Yichen looked at it for a while, and a mysterious and mysterious feeling arose in his heart: "System, stop!"

"Congratulations to the host, you have drawn a reward. Your height will increase by 10cm in 2 months!" The system's voice sounded, and Liu Yichen knew what reward he had drawn.

In an instant, Liu Yichen felt a hot air flowing through his body, as if countless ants were biting him, which was both comfortable and uncomfortable.

But at this time Liu Yichen was more excited and excited!

Height increased by 10cm in 2 months?

My current height is 175cm. If I grow another 10cm, I will be 185cm. 185cm is already outstanding among the high school students in Qingcheng.

"That's great. I thought my height could only stay at 175cm in the future, but I didn't expect that the random lottery opportunities in this system would reward people with height increases!" Liu Yichen wanted to laugh out loud, he was so excited.

Although the height of 175cm is not short anymore, it is already at the upper level in the class, and there are only a few people in the class who are taller than him, but Liu Yichen is still a little dissatisfied with his height, because when he goes to college, he will find that the height of 175cm

It's really ordinary. In the eyes of some girls, a height of 175cm is just the passing line, and a height of 180cm meets the requirements.

"Is this system quite humane? It didn't directly increase my height by 10cm. If my height increased by 10cm, others would definitely treat me as a monster. I can't explain it clearly." Liu Yichen had a good impression of the system at this time.

Slowly, he gave a big thumbs up.

Although it is a bit exaggerated to increase his height by 10cm in 2 months, it is not impossible. When he was in the first grade of junior high school, his height increased by 10cm in 2 months, so much so that some people said that he was bitten by a bee. And during this period of physical growth,

A lot of height growth in a short period of time is not an isolated case, but a common example, even in high school.

Liu Yichen was in a good mood, humming a song and went home. At the same time, he was already thinking about it. The next goal is mathematics. After reading all the mathematics textbooks, he will raise his mathematics level to lv1. If nothing happens, he will get it again.

A chance to draw will follow.

But when he returned home, Liu Yichen thought of something while taking a shower. Tomorrow is Feng Lin's birthday. What gift should he give?

This is a question worth thinking about!

You can't go to a birthday party and end up empty-handed. Although he is thick-skinned, he is not that thick-skinned.

"Sister, sister, let me ask you something. What gift do you girls most want to receive on your birthday?" Liu Yichen quietly asked Liu Tingting while Mr. Liu and Mr. Deng were going to bed.

"Liu Yichen, you won't fall in love at school, will you? You are so brave!" Liu Tingting's eyes widened and she covered her mouth with her hands, full of disbelief.

"No, no, it's a friend's birthday tomorrow!" Liu Yichen said quickly: "Don't make wild guesses. Our President Deng said that you can only fall in love when you are in college. Falling in love in high school is premature love, and early love is wrong."

"Come, tell me, is that girl pretty? She must be very pretty, does she have a face with oval seeds and a clear and pleasant voice?" Liu Tingting lowered her voice and kept looking at the door to prevent others from noticing when they came in.

Liu Tingting is now very curious about what kind of girl can become Liu Yichen's friend. She knows that from kindergarten to now, Liu Yichen has not had any friends of the opposite sex, and the reason is - girls who want to be friends with him

, so ugly!

"Why are you so gossipy?" Liu Yichen rolled his eyes and said, "I told you we are just friends, then we are just friends. You just need to tell me what gift the girl wants for her birthday."

"Dolls, animal dolls, write some blessings on the postcard, that's it!" Liu Tingting said, although she was still curious, she did not continue to ask further.

"Here are the notes for you. These are the notes I took when I was reading the math textbook. It contains a summary of knowledge points and classic question types. I hope it will be helpful to your math." Liu Yichen took out a notebook from his pocket and handed it to Liu Tingting.

.

Then Liu Yichen exited Sister's room.

"This guy Liu Yichen seems to be in a relationship. I want to see which girl he is in a relationship with?" Liu Tingting looked at Liu Yichen's leaving figure and put her chin in her hands thoughtfully: "Deng Lingling is in Qing.

She is studying in Cheng No. 1 Middle School, I will find time to ask her to pay attention to her at school."

It is said that women have a gossipy heart, and this is indeed true.

At this time, Liu Tingting's heart of gossip burned brightly in her heart, as if she wanted to transform into a detective to investigate the truth.

Liu Yichen didn't know what Liu Tingting was thinking. When he returned to the room, he took out mathematics and read it. Compared with physics, chemistry, biology, and mathematics, there was no doubt that the textbook had much more pages and knowledge points. For example, Liu Yichen is now

The elective 4-1 I am studying has only three chapters, namely three similar chapters.

The determination of angles and related properties, the positional relationship between straight lines and circles, and the discussion of the properties of conic sections are all selected lectures on set proofs. This type of knowledge requires the known conditions of the topic combined with geometric figures, and requires the ability to understand figures.

It's very high. If you're not sensitive to geometric figures, you're basically doomed.

This elective volume has two key points, which are the determination of similar triangles and the positional relationship between straight lines and circles. This involves exploring different situations when straight lines and circles are tangent or intersect.
Chapter completed!