1, explain in detail. The fourth grade is the time to lay the foundation. The "Five-Three Excellent Papers" are closely related to the textbooks published by People's Education Press, and the answers are more comprehensive, which is helpful for students to improve their grades.

2. The difficulty is moderate. The "Five-Three All-Excellent" paper in the fourth-grade People's Education Edition is well done. The questions above are lean, rich in content, difficult and always flexible, which is very helpful for children's learning.