No matter what article, once selected into the Chinese textbook, it will no longer be an independent work in the original sense, but an organic part of the entire textbook system, which is "the foundation of basic skills training". "Reliance on basic skills training"? ['Various works included in Chinese textbooks.', 'Those works that maintain their original meaning and exist independently.', 'An integral part of the entire textbook system.', 'Those works that are no longer in the original sense and exist independently.']