[
  {
    "type": "single",
    "category": "HTML",
    "question": "以下哪个标签用于定义段落？",
    "options": ["A. 
", "B. 
", "C. 
", "D. "],
    "answer": "A",
    "explanation": "
 标签定义文本段落。"
  },
  {
    "type": "multi",
    "category": "CSS",
    "question": "以下哪些是盒模型属性？（多选）",
    "options": ["A. margin", "B. padding", "C. border", "D. color"],
    "answer": "A,B,C",
    "explanation": "margin、padding、border 是盒模型三部分。"
  },
  {
    "type": "judge",
    "category": "HTML",
    "question": "HTML 是一种编程语言。",
    "options": ["正确", "错误"],
    "answer": "错误",
    "explanation": "HTML 是标记语言，不是编程语言。"
  },
  {
    "type": "fill",
    "category": "JavaScript",
    "question": "声明常量使用的关键字是 _______。",
    "answer": "const",
    "explanation": "ES6 使用 const 声明块级常量。"
  }
]