After learning "chemistry makes the world more colorful", why do you want to start classes? (Exercises in the Introduction to Grade Three of People's Education Press)

After studying chemistry, you can not only know the composition of substances, but also know their internal structure, properties and changing rules, and know how to use them to make chemical products, learn chemistry, explore chemistry and master the history and methods of chemistry.

It is chemistry that produces today's glasses, lunch boxes, plastics and some substances that do not exist in nature.