On the afternoon of September 24, 2043, the two classes of high mathematics were about to end, and after Liu Guilan, a professor of high mathematics, assigned a new homework to everyone, Professor Liu said: "Today's class is here, there are still ten minutes, and the rest of the time is handed over to the instructor Wang Xiaoyan, she has something to say to everyone." Professor Gao Math stepped off the podium and went out. Instructor Wang Xiaoyan walked up to the podium with a stack of homework.

Instructor Wang Xiaoyan said: "I have already corrected everyone's homework in the last class. Please stand up. Wang Xiaoyan looked at the classmates below and began to roll out their names, and the classmates who called their names stood up one by one. Wang Xiaoyan shouted: "Di Tengfei, Tian Xiaorui, Huo Caixia......" There are a total of thirteen students who were named, all of whom are from our 4301 class.

Instructor Wang Xiaoyan said: "Tell me, why are you so wrong in the answer to the second question, you should have 20.57 and your answer is 20.75, you all tell me why, Di Tengfei, you talk about it first." Xiao Di said: "I made a mistake in my panic." Director Wang said: "Tian Xiaorui, did you also panic and write it wrong." Tian Xiaorui didn't dare to raise her head, the bottom of her head was almost up to her chest. Huo Caixia said: "Report to the instructor, I wrote the wrong result in a panic. Supervisor Wang said: "If one person writes the wrong result, there are twelve students in the class who make mistakes together, which shows a problem, what kind of problem does it illustrate." Twelve of you copy your homework. As a new generation of college students and heirs to the future construction of the motherland, are you worthy of the ardent expectations of the people of the motherland and the hard-working parents who provide for your studies? Sorry for all of you, including yourselves. When the thirteen of you go back, do your last homework all over again and hand it over to me tomorrow. In the future, I don't want something like this to happen to our Class of '43 students, otherwise I will deduct your moral points. Okay, without further ado, you guys go back to your homework skills and get out of class. Instructor Wang put down the homework book and walked out of the lecture hall, and the students went to the podium to get the homework book.

Liu Yuexiao found her homework book first, and took out mine by the way. Liu Yuexiao said: "Continue, here you go." I took the workbook and said, "Thank you, Yuexiao." Liu Yuexiao said: "It should be me who says thank you, if you don't explain it seriously, I will definitely be punished." I said, "After you finish your homework, you must check it carefully, and if you do, you won't be wrong about all thirteen." Yue Xiao said: "Several of them copied Huo Caixia's squad leader's homework, and everyone didn't check it carefully, so they were all wrong." ”

Xiao Di, Xiao Rui, and others surrounded the squad leader Huo Caixia and said, "It's all because you were careless and made the wrong answer." Huo Caixia said: "Who asked a few of you to copy it without even looking at it." Cheng Qing said: "You still need to read the homework, and if you are wrong, you will be wrong." ”

Liu Yuexiao called Tian Xiaorui and said, "Let's go, Xiaorui, we have to go to the logistics office to get the task this afternoon." Tian Xiaorui said, "Let's send the books to the classroom." Following Liu Yuexiao and Tian Xiaorui to the second floor, I said, "You two have been approved to do volunteer work." Liu Yuexiao said: "I informed the two of us yesterday afternoon. I said, "Congratulations." Tian Xiaorui said: "Rejoice, rejoice." The two put the books on the desks in the classroom, and Liu Yuexiao said, "If you are busy first, we will leave first, and call me if there is something." Tian Xiaorui followed Liu Yuexiao towards the outside of the classroom, Tian Xiaorui said, "If you have something to call, you can continue." I said, "Got it." ”

There are still a few people in the classroom, Shen Zhe, Huo Caixia, Cheng Qing, Ren Hongyu, etc., most of them are among the thirteen people, they are rushing to make yesterday's homework, because they will have to hand over the left and right to the instructor to do it again tomorrow. I spread out my textbook and homework book and did the two advanced math questions assigned today.

Suddenly, my mobile phone rang, and as soon as I saw that the caller ID was from my senior Liu Chaojun, I connected the phone with a swipe of my hand. Liu Chaojun said: "Are you Yang Zaixu?" I said, "Yes, big brother, what's the matter?" Liu Chaojun said: "Nonsense, I can call you if there is nothing to do." I said, "Big brother, please speak." Chao Jun said: "On Saturday morning the day after tomorrow, our college volunteer federation is going to organize a charity newspaper sale activity, you ask a few of our fellow villagers in your class, Shen Zhe, Xiaodi, and your dormitory brothers have time, they are also members of the Zhilian, and this matter will be handed over to you to implement." I said, "Okay senior, make sure it's implemented." Liu Chaojun said: "This year, you must participate in the first event of the Zhilian." I said, "No problem, I'll do it and I'll get back to you later." Chaojun hung up the phone, I put down the phone and said: "I just received a call from Zhilian Liu Chaojun, this Saturday morning Zhilian held a newspaper charity sale, let me ask Shen Zhe, Xiaodi, Ren Hongyu, the three of you have time." ”

Ren Hongyu said, "I'm fine. Shen Zhe and Xiao Di said, "The two of us are fine." I said, "Just go if it's all right." I called Liu Yuexiao again, and I said, "Yuexiao, where are you, are Xiaorui together?" Liu Yuexiao said: "We are watering the lawn in front of and behind our dormitory building, Xiaorui is with me, do you have something." I said, "This Saturday morning, Zhilian has a charity newspaper sale, and senior Liu Chaojun asked me to ask if you two are free." Liu Yuexiao said: "I'm fine, wait for me to ask Xiaorui." On the other end of the phone, Liu Yuexiao shouted: "Xiaorui, there is an event in Zhilian on Saturday morning, do you participate?" Tian Xiaorui couldn't be heard, and at this time Liu Yuexiao said: "She's fine, she also participates in the event." ”

After confirming the situation of the six of us, I called Liu Chaojun and said, "Big brother, the brothers in our dormitory, and our fellow villagers want to go." The Chaojun said, "Okay, then you tell them to assemble at the north gate of the school at 6 o'clock on Saturday morning and leave on time at 6:20 p.m." I said, "Okay." "After hanging up the phone, I told Shen Zhe, Xiaodi, and Ren Hongyu the location and time of the gathering, and told Ren Hongyu, and told Liu Yuexiao and Tian Xiaorui the location and time of the gathering of Zhilian activities in the evening, and this arrangement was over.