Chapter 17: Functions of Thirty-Five Degrees

Five Years of College Entrance Examination, Three Years of Simulation, National Mathematics Paper for Science, 18 yuan. I bought a copy at a secondhand bookstore at the end of Jianshe Road after finishing work at the construction site at noon. The cover was folded at the corner, and inside were some notes written by the previous owner in blue ballpoint pen, but most of the pages were clean.

It was almost six o’clock when I got home, and the door was unlocked. Pushing it open, a wave of heat hit me. The window air conditioner was humming, but the air…