They have been taught by their parents since childhood that they must drink boiled water and not drink raw water directly, but no one has ever thought about why they have this habit.
Even Cen Li doesn't know this.
Everyone knows that raw water contains bacteria, so drinking boiled water is a natural thing, and we have never thought about the reason.
"Okay, teacher, let me tell you that this actually involves some historical grudges."
The biology teacher smiled slightly and said to everyone, "When Country M invaded China in the past, they used bacterial warfare and dropped fleas and mice carrying cholera and plague viruses through airplanes. In order to disinfect drinking water, the country allowed them to use this method
The habit of boiling water was also passed down from that time."
"So that's it."
“Country M is so bad that it goes so far!”
"I just learned that there is such a story behind drinking boiled water."
"Yes, I remember that in ancient China people drank cold water directly. Ordinary people couldn't afford hot water because firewood and charcoal fires were very expensive."
"..."
After the students listened, they all understood, and Cen Li was also taught something.
But like her classmates, she hates and detests those invaders from the bottom of her heart. They are really indifferent!
"So students should study hard and remember that if you fall behind, you will be beaten."
At this time, the biology teacher continued, "You are all very smart children and good prospects for the country's future. If you study hard, you will strengthen the motherland and no longer be bullied."
"Read for the rise of China!" Cen Li was the first to shout.
"Yes, study for the rise of China!" The students were quiet at first, and then they all shouted loudly.
"Okay, that's it for today's lesson."
The biology teacher was very satisfied with the students' reaction, and then said, "I will leave you a homework today, go back and make yogurt by yourself, and then talk about your experience in making it in the next class."
After saying that, the teacher left.
"If you want to make yogurt, you have to buy a bottle of real yogurt first. The sour yogurt like Wahaha's won't work."
After class, Cen Li said to Bai Xuanyuan, "I remember Zhongmin Parkway is selling it. School is out early today on Friday. I don't have to go to the city team. Let's go shopping together after school?"
At this time, yogurt was still a very rare thing and not many people drank it. This kind of thing that needed to be stored in the refrigerator and had a short shelf life was not sold in small shops in the town at all.
"Okay." Bai Xuanyuan nodded, and then looked at Huang Anchao.
"We are a team of four, we must be together." Huang Anchao immediately expressed his position by patting his chest.
The fourth person is naturally Chen Xiaohong.
As a result, Chen Xiaohong had to go home beforehand, and in the end it was just the three of them who went.
First, they called home using their IC cards to say hello, and then the three children rode bicycles to the city together.
This Zhongmin Parkway was newly opened this year. It is the first large-scale shopping mall in a small fourth-tier city. It attracted countless people as soon as it opened and was very lively.
Not only is it large, it also has elevators and escalators, which is unique in small cities.
Especially children are very curious when they take the escalator for the first time. They often stand up one level at a time, and then stand down another level at the same time, having a great time.
"Sweet cone!" There was a McDonald's under Zhongmin Parkway, and Cen Li's urge to eat cones was revived.
"I'm going to queue up." After locking his bicycle, Bai Xuanyuan stood at the back of the queue without saying a word.
There were already a lot of people at this time, and the three of them waited for a long time before they finally got the cone they had been longing for.
