If you look at the color version quickly, its color is clear, and then different colors will make you see it more clearly. If you use different colors to check the questions, it will be easier than the black-and-white version, and having different colors to mark the questions will make it easier for you to find the questions and more concise. The black-and-white version is ordinary black and white, it won't give you different colors, and then it will make it easier for you to find those topics. The black and white board is only black and white, and then the color of the whole book is very single, and then the title is difficult to find.