Black and white questions are good. It is better to learn to master the problems in black and white than to have to brush them for the following reasons:

1, with different ranges: black and white questions are full names. The key points of black and white exercises in senior high school can be contacted with more types of questions, which is conducive to mastering key knowledge in the exam, while the required questions are only aimed at some key types in the textbook unit.

2. Diversity is different: black and white questions are carefully designed and practiced in class, in class and every day. The questions are novel, flexible and diverse, with comprehensive knowledge and outstanding ability. Most of the required questions are a kind of questions, which have no practice value.