On the morning of September 21st, Ding Ding Ding!

This morning, Lanjie participated in the last preliminary round --- the preliminary round of the biology competition.

The preliminary round of the biology competition can be said to be the easiest, but it can also be said to be the most difficult.

The simple thing is that the questions are not difficult.

The difficulty is that there are too many questions and too little time to answer.

This preliminary test paper has a total of 70 multiple-choice questions, 50 true/false questions, and 18 fill-in-the-blank questions (50 blank spaces), with a total of 170 points, and the answering time is 2 hours.

In other words, candidates have only 40 seconds to think when they make a choice, give a check, and fill in a blank.

From the first multiple-choice question, Lan Jie felt the pressure.

1. Which of the following experimental phenomena (some real, some fabricated) does not match what we have learned about cytokinesis?

A. Antimyosin antibody injection into dividing cells, resulting in cessation of cytokinesis;

B. When the myosin II gene is mutated, the cell can undergo nuclear division, but not cytokinesis;

C. Microscopic actin fibers F-actin arranged parallel to the fission groove;

D. Anti-actin antibody injected into dividing cells with no effect on cytokinesis.

After reading the question and the four options, 10 seconds were gone.

And these 10 seconds are still extensive reading, not intensive reading.

Lan Jie spent another 20 seconds reading it intensively, thinking for more than a dozen seconds before making a choice.

The topics of this biology paper are indeed not difficult, most of them are conceptual questions, and they test the depth and proficiency of students' biological knowledge.

Most of the biological dogs in the laboratory are engaged in manual labor, and the candidates in the biology competition examination room are also manual labor to make biological papers.

'The multiple-choice questions are done, there's still an hour left!'

'I'm done, there's 15 minutes left!'

'Damn, there's only 15 minutes left!'

Lan Jie panicked, there were only 15 minutes left in the exam, and he had just started to fill in the blanks.

Fill in the blank question 1: Please write any three types of incomplete metamorphosis insects, ____, ____, ____.

'There's no time to think, just write the answer!'

There is not enough time to think, so you can only rely on instinctive reactions. Without thinking, Ranger wrote about three kinds of insects: dragonflies, locusts, and bugs.

Fill in the blank question 2: The products of fatty acid β-oxidation are ____, ____, ____.

'There's no time to analyze, just write the answer!'

Lan Jie directly wrote the answer: NADH+H+, FADH2, acetyl CoA.

Fill in the blank last question: A couple with MN blood type has six children, and the probability of having three M blood groups, two MN blood groups, and one N blood group among these six children is ____.

'There's no time to calculate, just write the answer!'

It's impossible to write the answer directly, so you still have to do a little mental math!

Ranger did a quick mental arithmetic and came up with a probability: 15/256.

Ding Ding Ding!

The hand-in bell rings.

There was no time to check, and Lan Jie hurriedly handed in the papers.

Back home, Lan Jie was extremely pessimistic: "It's over, it's over, the preliminary exam of the biology competition has been smashed and exploded!"

The number of applicants for the digital competition and the physical competition is the largest, with more than 100,000 applicants nationwide every year. The number of applicants for the chemical competition is close to 100,000, and the number of applicants for the student competition is the smallest, close to 50,000.

Because of the large number of contestants, the competition of mathematics, physics and chemistry has a provincial semi-final between the preliminary round and the national competition, which is equivalent to going through two screenings into the national competition. This model has a high tolerance rate, if a player in the preliminary round played average, stumbling and risky to advance to the provincial semi-finals, then there is still one to two months of adjustment time, if the state is adjusted well, you have the opportunity to enter the national competition, and even get the national award, selected for the winter camp.

There are only preliminary and final rounds in the biology competition, and the error tolerance rate of this competition mode is very low, and if the preliminary round blows up, there will be no then.

Lan Jie was depressed: "Dad, why don't you bet on the topic of the biology competition?"

Lan Jinhui was also helpless: "You and I know everything? I really don't understand biology, and I can't bet on biology." Applejack, you've completed the preliminary rounds of the four subject competitions, what are your next plans?"

"I'm going to practice the long jump, and I'm going to participate in the national long jump competition soon. Mom and Dad, I'm full, I'm going to find Teacher Wei to practice long jump!"

After lunch, Lan Jie took his sports suit to Yangzhong and strengthened his long jump skills under the guidance of Mr. Wei.

The days of waiting for the results of the preliminary round of the chemical competition and the student competition are both difficult and full of expectations.

On the evening of September 24, Lan Jinhui and He Yuyi accompanied Lan Jie, and the family of three inquired about Lan Jie's preliminary results of the chemical competition.

Bite!

Langer, 100 points.

"Full score! I got a perfect score in the preliminary round of the chemical competition!" Lan Jie was very excited, and the full score meant that he would definitely advance to the semi-finals.

He Yuyi, who was full of kindness, was very proud: "The number competition and the chemical competition are all full scores, and the physical competition deducts two points, and the three disciplines of mathematics, physics and chemistry, Ajie, you have all qualified for the semi-finals, Ajie, you are too good!"

Lan Jinhui was also very happy, and at the same time, Lan Jinhui also raised a question that had to be taken seriously: "As of today, Ajie, you have obtained the qualification for the semi-finals of mathematics, physics and chemistry, and you have been shortlisted for the semi-finals with high scores, so you are absolutely unwilling to give up the semi-finals of any of the discipline competitions." In response to the preliminary round, Ajie, you mainly rely on your basic skills, and participating in the semi-finals and even the national competition is of course also a test of basic skills. ”

"But it's not enough to have the basics, it's just as important to have targeted guidance from an experienced coaching team. I think Applejack needs to be trained by your team of math, physics and chemistry coaches, so how do you allocate your time and energy? And that's not even counting sports, but if you count sports training, I think Ajay has 48 hours a day. ”

"Dad, you're right, in this special period, you can only rely on the theoretical limit of efficiency. It's definitely going to be tiring, but I'm not afraid of being tired!"

"Ajie, if you have this ambition and determination, your mother and I will be relieved. ”

On the evening of September 25, Lan Jie inquired about the results of his preliminary round of biology competition.

"151 points, 1 point higher than the qualification line of 150 points for the finals, so dangerous, so cool!" Lan Jie inexplicably gave birth to a strong cool crookedness, and it was also cool to crush the opponent, but it was not the coolest kind of cool, the coolest cool was about to lose, and suddenly he had an idea to steal the home opposite.

"The three semi-finals of mathematics, physics and chemistry, plus the national sports competition, I think it is already the limit, but Ajie, you have another one, you got the place in the national finals of the biology competition, how can this be good?"

Retired athlete He Yuyi's thinking is more direct: "No matter how many opponents he has, since he has signed up, he can't retire from the competition, and he can defeat these opponents one by one." ”