JSON 结构设计：存储做题进度和答题情况

{ 'user_id': '12345', 'progress': { 'total_questions': 100, 'completed_questions': 50, 'remaining_questions': 50 }, 'questions': [ { 'question_id': '1', 'question_text': 'What is the capital of France?', 'user_answer': 'Paris', 'is_correct': true }, { 'question_id': '2', 'question_text': 'Who painted the Mona Lisa?', 'user_answer': 'Leonardo da Vinci', 'is_correct': true }, { 'question_id': '3', 'question_text': 'What is the largest planet in our solar system?', 'user_answer': 'Jupiter', 'is_correct': false } // more questions... ] }