Xueba, I beg you to go and escort him quickly!

Yue Pingting, "???"

She was dumbfounded.

Random thoughts, what random thoughts?

Geek!

Yue Pingting blushed!

Immediately glaring at Xu Heng, he muttered in a low voice, "Xu Heng... you are too much!"

Xu Heng, "Don't make trouble, continue to read the questions."

There are mistakes in the fill-in-the-blank questions, and there are also multiple-choice questions.

Familial hypercholesterolemia (FH) is a genetic disease, and the frequency of homozygous patients in the population is about 1/100000.The picture is the pedigree of a certain FH family, the following statement is correct ()

A. FH is an autosomal dominant genetic disease

B. At least one of the parents of FH patients is FH patients

C. The frequency of heterozygous patients in the population is about 1/500

D.Ⅲ6 disease gene is jointly provided by both parents

Xu Heng, "Analysis of the pedigree shows that both Ⅱ7 and Ⅱ8 are affected, and a normal daughter appeared in their offspring, indicating that the disease is a dominant genetic disease. Ⅱ8 is affected, but its daughter is normal, and the disease-causing gene is located on the autosome .”

"The genotype of Ⅲ6 may be dominant homozygote or heterozygote, so the disease gene may be provided by both parents, or it may be provided by one of them, so D is wrong."

Xu Heng told Yue Pingting all the wrong topics.

Every question hit the nail on the head, leaving a deep impression on Yue Pingting.

"Read it again by yourself, and give me the test paper after reading it, and I will tear it up."

In an instant, Yue Pingting became nervous.

"Ah! What! You want to tear up the test paper you finally produced? Why?"

Xu Heng, "You've memorized it in your head, what's the use of these test papers?"

"Also...why did it take so long for me? Didn't I just come up with it when you were doing the questions?"

Yue Pingting, "I... this..."

She is speechless!

I didn't know how to refute for a while.

Xu Heng looked at Yue Pingting, and said again, "Get ready, there is still a test paper for you before the evening self-study is over."

Yue Pingting pouted, "Xu Heng, why are you...?"

Xu Heng, "Do you want to be dismissed?"

Geek!

In an instant, Yue Pingting regained her spirits.

She immediately corrected her attitude and stopped being pretentious.

"bring it on!"

Xu Heng gave the question directly:

Let x∈R, solve the inequality |x|+|2x-1|＞2.

Xu Heng, "This is a basic question, you can't go wrong!"

Yue Pingting, "I understand! But you asked me to read the biology test paper first and digest it..."

Prepared to have the test paper torn up, Yue Pingting paid more attention to the questions she got wrong.

After 10 minutes, she handed the test paper to Xu Heng, and then began to answer the questions.

shhhhhh...

Within a few minutes, Yue Pingting gave the answer.

And Xu Heng, after getting the test paper she made, directly tore it up, and then used the gesture of throwing a ball to hit it directly, and threw it into the trash can.

Yue Pingting answered the question, this time she was very confident and handed it to Xu Heng directly.

Because it's simple!

So she is full of confidence!

Xu Heng glanced at it, and after confirming that it was correct, he turned around, clenched it into a ball, and threw it into the trash can!

Then, every minute, Xu Heng asked Yue Pingting another question.

He doesn't come out casually.

But one question is easy, one question is difficult...

Repeat several times.

Yue Pingting's self-confidence is getting higher and higher.

When it comes to dealing with difficult problems, she no longer has the frowning face she had before, let alone fear.

Xu Heng watched and couldn't help smiling.

He finally let Yue Pingting face every question in the best condition.

You can't be scared as soon as you see a topic that you are not good at, and you haven't carefully reviewed the topic.

Xu Heng, "Here, a chemistry test paper, it still takes an hour."

Yue Pingting looked at Xu Heng, her eyes sparkled, but at the same time she was full of doubts.

Xu Heng, "?"

Yue Pingting, "Xu Heng, are you sure you haven't saved the test papers in advance?"

Xu Heng smiled, raised his hand and tapped Yue Pingting's little head.

"What are you thinking! I'm starting the timer now, you still have 59 minutes and 20 seconds... 19 seconds... 18..."

Yue Pingting started to read the questions in a panic.

1 Carbohydrates are important nutrients needed by the human body.Starch molecules do not contain…

2 The properties and uses of the following substances have a corresponding relationship...

3 At room temperature, the following groups of ions can coexist in a large amount in the specified solution...

……

Multiple choice questions one after another.

Yue Pingting read the question carefully: "The atomic numbers of the short-period main group elements X, Y, Z, and W increase sequentially, X is the most abundant element in the earth's crust, the outermost layer of the Y atom has 2 electrons, and the elemental element of Z Crystal is the most widely used semiconductor material, and W and X are in the same main group. The following statement is correct..."

After carefully looking at the options, she gave her choice.

After that, there are multiple choice questions.

This is not the same as multiple choice questions!

Among the indeterminate items, there are single-choice and multiple-choice, which increases the difficulty.

To Yue Pingting's surprise, Xu Heng even drew a picture for himself!

The picture is still very standard!

This made Yue Pingting even more surprised.

This man is so reliable!

So reliable!

gosh...

and many more!

Time is running out, I can't be an idiot, I can't be an idiot...

Look at the question!

Yue Pingting shook her head, recovered 0.4, and continued to read the questions carefully.

"N2O, NO, NO2 and other nitrogen oxides are air pollutants, and the tail gas containing nitrogen oxides needs to be treated before it can be discharged..."

Looking at it, Yue Pingting lost her mind.

"Wow! This flask is so realistically drawn... a three-neck flask... this beaker... this measuring cup..."

"It turns out that Xu Heng is not only good at painting landscapes, but also good at painting these things."

"Hey……"

Suddenly, Yue Pingting became extremely humble.

I feel more and more that I am not good enough for Xu Heng.

Yue Pingting felt a little lost.

Xu Heng, "There are still 15 minutes."

The voice of "ruthless" brought Yue Pingting back to reality, and she continued to read the question.

This is already the last question.

Methyl propiolate (CH≡C-COOCH3) is an important organic chemical raw material with a boiling point of -105°C.

The reaction to prepare a small amount of methyl propiolate in the laboratory is...

The experimental steps are as follows:

Step 1: In the reaction flask, add 14g of propiolic acid, 50mL of methanol and 2mL of concentrated sulfuric acid, stir, and heat to reflux for a period of time.

Step 2: ...

……

Yue Pingting answered the questions seriously, and after she finished, there were still a few minutes left.

This is the time left for Yue Pingting's first exam!

Even she was stunned for a moment, she was not stopped by Xu Heng, but she finished it first.

Yue Pingting frowned and looked at Xu Heng, "Isn't it time yet?"

Xu Heng, "There are still 2 minutes."

Yue Pingting, "!!!"

……

PS: Thanks to [Blood Blade God Emperor] [Pursuing Interesting Soul] [Yu Yu] [Z Blue Bookmark] for their support! .

Chapter 223

An inexplicable self-confidence arises spontaneously.

Yue Pingting's whole person feels different!

At the end of handing in the test paper, Xu Heng checked for errors again, explained it directly, and then let Yue Pingting digest it, and then tore up the test paper!

"Ring Ling Ling..."

Evening self-study is over.

The two went back to the dormitory after getting bored in a place where no one was around.

After returning to the dormitory, Yue Pingting felt more fulfilled than ever.

There was a smile on his face.

Seeing this, the roommates couldn't help asking, "Xu Heng is back, you are so happy!"

Yue Pingting laughed, "Hehehe...that's for sure!"

A roommate suddenly said, "That's right! Yue Pingting, I see that you seldom rest between classes today, and you have been working hard on the questions... Did you find any good test papers?"