() The morning is the time for the mock test of the third year of junior high school, and in less than 4 months, they are about to take the high school entrance examination, and everyone is immersed in a tense atmosphere.

Lin Xia was waiting for Lin Xi to finish the exam in the teacher's office of the third year of junior high school, and when he came to school in the morning, Yang Weiwei had already returned.

And at the beginning of the exam, Lin Xia also saw Wei Peng. But Wei Peng's mental state is not good, and he seems to be preoccupied.

While waiting, Lin Xia received a message from Li Lin. The fragrance she gave to Shen Yu yesterday was an ordinary sleeping aromatherapy, which had the effect of relieving fatigue and calming the nerves.

But coincidentally, this incense is the same thing as the black lump found on the body of the deceased Liu Meixue.

The autopsy report showed that the real cause of her death was mercury poisoning.

Judging from the stiffness of the corpse, it was first dead before being placed on the roof by the fishing line through the limbs and neck.

Regarding the scars on the back, it was probably a scar from two years ago. The most recent scar was also about a year ago, so the scars on the back are of different shades and heal.

So this has nothing to do with Liu Meixue's death.

But the abusive language on the school uniform is written on the back, so Yang Weiwei must have seen the scars on Liu Meixue's back.

If Yang Weiwei had seen it and written this on her clothes, it would have been more of a hatred in it.

In the interpersonal relationship investigation, no contradictions and conflicts between the two were found, why did Yang Weiwei do this?

Originally, Lin Xia planned to talk to Yang Weiwei about it, but after such an analysis, Lin Xia didn't want to talk to her much for the time being.

Looking at the cause of Liu Meixue's death, mercury poisoning. If you want to get mercury in school, the only thing you can get in is a chemistry lab other than a thermometer.

Lin Xia looked up and saw the chemistry teacher Xu Ying correcting the test papers that had just been completed.

"Teacher Xu, are you busy now?"

Xu Ying looked up when she heard this, only to see that it was Lin Xia. also knew that Lin Xia was Lin Xi's sister, because of Liu Meixue's matter, she was investigated at school.

"Oh not busy, what's the problem?"

Lin Xia walked over and asked softly, "Are there chemicals like mercury aqua regia in our school's laboratory?" ”

Xu Ying pushed her glasses and said, "Yes, there is, but these are high-risk chemicals and are forbidden to be placed on the surface."

These items will be in the locker, and the keys are all with me. ”

"Got it, so do you have time today? I want to take a look at the chemistry lab. ”

Xu Ying looked at the test paper in her hand and then looked at the time.

"Go now! There are still 20 minutes to finish the test, which is still enough time. ”

Lin Xia hurriedly thanked him, and then followed Xu Ying to the laboratory area located on the fourth floor of the teaching building.

Four floors are dedicated to hands-on courses, such as a computer lab, a physics lab, a chemistry lab, and more.

Opening the door of the chemistry laboratory, Xu Ying introduced Lin Xia one by one.

"This is the chemistry lab, where students usually do experiments. If you need to understand the course of high-risk chemicals, I will explain in advance that the small dose of the item is extracted to avoid collision and accidents. ”

As he spoke, he pointed to the relatively tall cabinet behind the laboratory, on which there were many chemicals on display, but the high-risk chemicals were placed on the top, and they were all locked with special keys.

Lin Xia walked over to take a look, and frowned when he saw the mercury bottle.

"Mr. Xu, is there only so much mercury in our laboratory?"

"There are really not many high-risk items, after all, they are generally only doing some small experiments... Ay! That's not right! I still had a small half bottle when I did the experiment last week! ”

As Xu Ying was talking, she found that the mercury bottle had bottomed out, and only a thin layer of mercury water was still in the bottle.

"This... It's impossible! Is it evaporating without a tight cover? ”

"The mouth of the bottle is tight, and there is no sign of evaporation."

Lin Xia glanced at it again before replying, and then looked at a large set of keys in Xu Ying's hand.

"Do you see the key to the mercury bottle cabinet is yours?"

Xu Ying was also a little panicked, after all, this is not a trivial matter, if anyone takes the mercury in the mercury bottle, it is easy to have an accident if the dose is too much.

Xu Ying rummaged for a long time and was stunned that she couldn't find the key to the mercury bottle, so she put it down and began to be anxious.

"It shouldn't be! The keys should be here! How could it be... ”

"Who do you usually ask to help with the chemicals?"

Xu Ying didn't raise her head and said: "I took it myself, the children are still too young, these chemicals may leak and evaporate if you are not careful... ”

Xu Ying suddenly stopped talking about this, as if she had thought of something.

Lin Xia took the opportunity to continue asking, "Are you sure that no one else has opened this cabinet?" ”

Xu Ying looked at the cabinet behind Lin Xia a little stunned, and suddenly said, "I remembered!" ”

As he spoke, he began to look for things in the bag containing the key, and after a while he found a small key.

"Those keys are usually strung together in a keychain, and once Mr. Wei said that he wanted to use the laboratory, and he broke the thermometer and wanted to pour mercury into the mercury bottle, for fear that casually handling the mercury would hurt the students."

It's Wei Peng again, and now almost all the evidence points to Wei Peng. If Wei Peng is really the murderer, then what is worse is the motive for the killing.

"Okay, I understand, thank you, Mr. Xu. It seems that the students' exams are coming to an end, so let's check them out! ”

Seeing that Lin Xia didn't ask again, Xu Ying didn't mention the loss of mercury again. The two of them left the laboratory with their own concerns.

Back on the third floor, Lin Xi came out after the math exam, and he was looking around at the door looking for Lin Xia!

Seeing Lin Xia coming down from upstairs, she happily ran over and said, "Sister, I'm done with my math test!" ”

When she ran over, she found that the chemistry teacher was also there, and hurriedly greeted her obediently: "Hello Mr. Xu." ”

Lin Xi was originally good at studying, and his personality was also likable, and there was no teacher who didn't like it.

"Well, Lin Xi did well in the chemistry exam this time, if he worked hard during this period, he would have been able to get the first place if he didn't have the first place in the exam."

"Thank you, Mr. Xu, I will work hard!"

Teacher Xu left after saying a few words, and Lin Xia took Lin Xi to the playground.

The two of them asked Lin Xia as they walked, "How did you do in the math test?" ”

"Don't worry! You still don't worry about my exam? I'm blessed by the male god! ”

"You are poor! If you fail the exam, I will be very aunty and say cancel your vacation. ”

Lin Xi grimaced and replied with a grin: "No!" My sister can't bear to suffer so much as my little cutie. And ah! This time the math is really super simple, and I wonder if Mr. Wei has released the water. ”

Lin Xia was a little more cautious when he heard Wei Peng now, and asked tentatively, "Is it?" Does Mr. Wei often release water in math exams? ”