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The fourth grade of primary school, the second volume, how about math?
This book is very good. These questions are all about choosing some real questions in the exam.

Very representative, but also presents a very detailed answer, to help students encounter problems that they can't, find answers in time, and deepen their understanding and impression.

Most of the questions in the primary school semester exam are relatively basic.

It is suitable for some students with good foundation and can help them get very high grades in the exam.