Hengshui Middle School.

A name with a storied twist.

To a certain extent, it can represent the pinnacle of the entire Huaxia high school education level.

In the ranking of the top 500 middle schools in China's academic competition, Hebei Hengshui Middle School ranked first in the country.

In the annual college entrance examination, just in this one middle school, the average number of students with a score of more than 700 is stable at more than ten, and the number of students with a score of more than 600 has reached two or three thousand.

Every year, hundreds of students are admitted to Tsinghua University and Peking University, and the number of students admitted to the "985 Project" and "211 Project" universities has even reached three or four thousand.

Qianbei Middle School, where Su Mu is located, is also a provincial key middle school.

But only three or four baby bumps can be admitted to Qingbei every year, and the gap is not ordinarily large.

Therefore, when Su Mu learned that this BO final would be held in Hengzhong, he still had some expectations.

August 10th.

The first day of the official schedule.

In the morning, there was an opening ceremony in the auditorium of Hengshui Middle School, followed by a visit to the examination room.

In the afternoon, each team will return to the hotel to communicate freely, and the team leader and coach will supplement some topics.

may be because of a "small misunderstanding" yesterday, Jiang Yuhang obviously cares a lot about Su Mu, and feels that he has the obligation to help Su Mu "stabilize his mentality".

Su Mu didn't know how to describe it.

What does he think, how does he think that Jiang Yuhang is the student whose mentality is not very stable.

I got up at six o'clock in the morning and hurried to review the biology Olympiad questions, which made Su Mu, a crazy demon who brushed the questions, a little ashamed.

The opening ceremony was boring.

It is nothing more than the leaders coming up to the stage to cheer up, and then taking a group photo together.

Visiting the exam room is to take a walk around the school, because of the legendary bonus, many students are interested.

But after a round trip, most of the students' interest faded.

No matter how legendary it is, it's not particularly different from the high school you're in.

The teaching building is the teaching building, the stadium is the stadium, the only point that is different, I am afraid the real difference is that the school is cleaned every day, which is more clean and tidy.

Su Mu was also visiting the examination room, and under the introduction of Jiang Yuhang, he began to seriously look at several of his teammates.

There are eight students in Zhedong Province participating in the competition this time, seven boys and one girl, and Jiang Yuhang knows four of them.

The girl's name is Guo Qingya, a student of Qiantang Middle School, with a very quiet personality and outstanding appearance.

At that time, when I was training in Qiantang City, it also attracted a lot of attention.

Among the other three boys, Chu Mingzhe and Guo Qingya are also from Qiantang Middle School, and a boy named Ding Lezhan and Jiang Yuhang are both from Qiantang No. 3 Middle School.

There is also a boy, Kauss Chen, who is a student at a liberal arts high school.

At that time, when they participated in the training camp in Qiantang City, the five of them were relatively familiar, but Su Mu and the other two boys did not participate in the training camp because of the distance.

In fact, there is no need for Jiang Yuhang to introduce too much, because during the exchange and study in the afternoon, coach Liu Kaian had already called all the participating students from East Zhejiang Province together.

"These are a few of the arguments we discussed at the team leader's meeting yesterday, so you can focus on them."

"Don't have too much pressure, the experimental questions this time should be simpler than in previous years, and the most important thing is the written test."

"You can take a look at the questions I picked out first, and you can discuss them briefly."

Liu Kai'an gave each student a chapter A4 paper with several questions and key test points.

Several students didn't say much, and each got the test questions and looked at them carefully.

The first question is multiple-choice.

Which of the following statements about the gas exchange organs of animals is true?

a. Regarding starfish, the gills are responsible for gas exchange, but the tube foot has nothing to do with it.

With regard to locusts, well-developed muscles around the trachea control the movement of air in and out of the body through openings on the surface of the body.

c. For fish, the flow of blood in the gill filaments is in the same direction as the direction in which water is removed from the body from the mouth and pharynx.

d. For birds, when breathing, the two air sacs contract to expel the gas, while the lungs are filled with air.

In humans, the surfactant in the fluid on the inner surface of the alveoli is necessary to increase the alveolar surface tension, without which the alveoli will collapse during exhalation, thus organizing the pathway of the gas during inspiration.

Several student divisions frowned slightly.

This question focuses on some animal and plant modules in biology, and tests students' general knowledge about gas exchange.

Su Mu looked at it slightly, the question is not too difficult, and the answer should be B.

"How? Did anyone get the answer to the first question? ”

"Of course, the questions are very simple, and the important thing is not to make the answer, but to grasp the details." Liu Kai'an looked at a few pensive students and asked.

"Jiang Yuhang?" Liu Kaian looked at Jiang Yuhang who was contemplative.

Jiang Yuhang shook his head, "I only know that A and E are wrong, BCD is not very clear, this question is too biased." ”

"In previous years, there was no question about gas exchange."

"Just because it didn't come out in previous years doesn't mean it won't come out this year." Liu Kaian shook his head with some disappointment, in the impression of the previous urban training, Jiang Yuhang was the most solid in basic knowledge.

Unexpectedly, the first question that was added just now encountered difficulties.

"Can anyone give the right answer?" Liu Kai'an looked around.

But none of the students looked at him.

"Guo Qingya, what is your answer?"

Liu Kaian looked at the only girl again.

"It should be one of C and D," Guo Qingya lowered her head, her voice a little small.

She is mainly a review of the experimental side.

Liu Kai'an's eyes were even more disappointed, because Guo Qingya's answer was wrong.

I sighed a little helplessly.

"Su seems to be called Su Mu, right, what is your answer? Can you break it down a bit? ”

Liu Kai'an looked at a few people, only Su Mu's face was a little flat.

I don't know if I'm waiting for an answer or if I'm confident.

If Su Mu can't answer, he can only publish the answer directly.

"The answer is B."

Su Mu smiled.

Finally, Liu Kai'an's eyes lit up. "Can you explain a little bit?"

"This question is very," Su Mugang wanted to say, this question is very simple.

But looking at the inquisitive eyes of several students.

I still suffocated it back.

"The gills and tubular feet in option A are the main organs of the starfish for gas exchange, and the oscillation of the cilia inside can cause flow in the body cavity, and the outer epithelial cilia can cause the flow of seawater, both of which can accelerate the exchange of gases."

"Option B is correct, and the answer in C is the opposite, because the direction of the flow of water in the gills of the fish is opposite to the direction of the blood flow, which can produce a countercurrent exchange, which can allow the oxygen in the water to fully enter the blood."

"Birds with option d generally have a dual respiratory system, with nine main air sacs in addition to the lungs instead of two."

"When the bird is resting, it mainly relies on the movement of the intercostal muscles and abdominal muscles to breathe in the lungs. When flying, it mainly relies on the movement of the pectoral muscles to breathe. ”

"E is relatively simple, this high school biology has been about the five functions of alveolar surfactant."

Su Mu made his own analysis of each option.

Actually, this question is really simple.

Anyone with a modicum of biological knowledge should know.

He was a little puzzled, why did the other teammates seem to hesitate for such a simple question?

Shouldn't it be obvious at a glance?

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