Seeing this toothy expression, he smiled, and a guess suddenly flashed in his mind, and he sent another rabbit sky expression reading a book.

Su Nian looked at the big rabbit frowning on the mobile phone screen and understood what the other party meant.

She typed: Which question do you not know? Shoot it to me.

"Hahaha..."Yi Rin couldn't hold back and laughed, he just wanted to see if she only had QQ's own emojis, she thought he wanted to ask questions.

Well, he got up and went to the desk to open a set of comprehensive test papers, found a chemistry question that looked more difficult, took a picture, and sent it.

Na2S2O5 can be used as an antioxidant in food. In the determination of Na2S2O5 residue in a wine, 50.00 mL of wine sample was taken and 0.01000 mol· L−1 iodine standard was titrated to the endpoint with a consumption of 10.00 mL. The ionic equation for the titration reaction was _____________, and the residue of Na2S2O5 in this sample was ____________g· L−1 (in terms of SO2).

After Su Nian finished reading the question, the answer basically came out, she wrote the answer on the paper, took a picture of Yi Rin and sent it over.

S2O52-+2I2+3H2O= 2SO42-+4I-+6H+，0.128

Look at this answer that is exactly the same as the standard answer.

Yi Rin: ......

He also knew it was this, he just didn't know where the answer came from.

In Xueba's mind, the answer can be answered in one step, doesn't there need to be an intermediate process?

He didn't know, and he was a little embarrassed to ask.

After sending it over, Su Nian stared at the question and his own answer again, remembered Yi Rin's usual level of doing the question, and sent another voice message to explain the answer in detail, and help others to the end.

After all, he is so busy, he is still serious in his studies, and he is still a good person.

The girl's voice is soft and clean, her speech is unhurried, coherent and logical.

Listening to her voice, Yi Rin's mind flashed back to the words he had heard in the playground the morning he left, and her voice was like this at that time, and she remembered how she was playing chess on the balcony.

After the voice was played, he only listened carefully to the first few seconds, and the back was distracted.

Thinking that she might still be waiting for his reply, she hurriedly sent a thank you Tusky.

When Su Nian saw this, he knew that he understood, and there was no problem. She put down her phone, turned off the lights and went to sleep.

In the hotel room, Chen Nan came in from outside and saw Yi Rin putting his mobile phone to his ear and smirking.

"Listen to what? So happy? ”

Seeing him, Yi Rin pressed the lock screen, "It's nothing, is there something wrong with Brother Nan?" ”

Chen Nan looked at the test paper on his desk for a moment and said, "Oh, it's nothing, I'm just here to tell you that there is something going on in the company, I'll go back first, and I'll come back tomorrow afternoon." It's been a tiring day today, so don't study too late. ”

Yi Rin: "yes, I see. ”

As soon as Chen Nan went out, he turned on his mobile phone again and listened to the voice to understand this chemistry problem.

His tablemate usually looks quite cold, but he is actually warm-hearted.

In fact, he added her today, originally wanting her to help get the test papers.

I didn't say it, I didn't say it, my eyes swept the pile of test papers on the table, and I couldn't finish writing it anyway.

The schedule of this weekly examination is completely in accordance with the schedule of the college entrance examination, in order to allow students to adapt to the rhythm of the college entrance examination in advance, treat the usual examination as the college entrance examination, and treat the college entrance examination as the usual examination when the time comes, and deal with it calmly.

Three self-study classes in the evening, free to review the subjects to be taken tomorrow.

After the second self-study class, Li Mingjia rushed to Su Nian's seat with a roar and squeezed her into the inner position.