题目

阅读理解 Come and See at Wenhua StoreDo you need school things? We have pencil boxes for only 5 dollars each（每一）. The pens are 3 dollars each. We have erasers for 2 dollars and pencils for only 1 dollar. A big notebook is 10 dollars and a small one is 7 dollars. Come to Qingfeng StoreWelcome to Qingfeng Store! We are having a great sale now. We have nice clothes for boys and girls. For girls, we have nice skirts in all colors for only $35. We have all sizes（尺码）.For boys, we have T-shirts in black and brown for only $30. You can find what you want here. 方程化成一般形式_____________ 。