{
  "schema": "synthetic-question-fixture-v1",
  "synthetic": true,
  "questions": [
    {
      "id": "Q001",
      "type": "single",
      "stem": "虚构工坊有3盒积木，每盒2块，共有多少块？",
      "options": [
        "6",
        "5",
        "8",
        "7"
      ],
      "answer": [
        "A"
      ],
      "explanation": "3×2=6。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q002",
      "type": "single",
      "stem": "虚构工坊有4盒积木，每盒2块，共有多少块？",
      "options": [
        "9",
        "8",
        "10",
        "7"
      ],
      "answer": [
        "B"
      ],
      "explanation": "4×2=8。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q003",
      "type": "single",
      "stem": "虚构工坊有5盒积木，每盒2块，共有多少块？",
      "options": [
        "11",
        "9",
        "10",
        "12"
      ],
      "answer": [
        "C"
      ],
      "explanation": "5×2=10。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q004",
      "type": "single",
      "stem": "虚构工坊有6盒积木，每盒2块，共有多少块？",
      "options": [
        "13",
        "11",
        "14",
        "12"
      ],
      "answer": [
        "D"
      ],
      "explanation": "6×2=12。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q005",
      "type": "single",
      "stem": "虚构工坊有7盒积木，每盒2块，共有多少块？",
      "options": [
        "14",
        "13",
        "16",
        "15"
      ],
      "answer": [
        "A"
      ],
      "explanation": "7×2=14。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q006",
      "type": "single",
      "stem": "虚构工坊有8盒积木，每盒2块，共有多少块？",
      "options": [
        "17",
        "16",
        "18",
        "15"
      ],
      "answer": [
        "B"
      ],
      "explanation": "8×2=16。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q007",
      "type": "single",
      "stem": "虚构工坊有9盒积木，每盒2块，共有多少块？",
      "options": [
        "19",
        "17",
        "18",
        "20"
      ],
      "answer": [
        "C"
      ],
      "explanation": "9×2=18。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q008",
      "type": "single",
      "stem": "虚构工坊有10盒积木，每盒2块，共有多少块？",
      "options": [
        "21",
        "19",
        "22",
        "20"
      ],
      "answer": [
        "D"
      ],
      "explanation": "10×2=20。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q009",
      "type": "single",
      "stem": "虚构工坊有11盒积木，每盒2块，共有多少块？",
      "options": [
        "22",
        "21",
        "24",
        "23"
      ],
      "answer": [
        "A"
      ],
      "explanation": "11×2=22。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q010",
      "type": "single",
      "stem": "虚构工坊有12盒积木，每盒2块，共有多少块？",
      "options": [
        "25",
        "24",
        "26",
        "23"
      ],
      "answer": [
        "B"
      ],
      "explanation": "12×2=24。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q011",
      "type": "single",
      "stem": "虚构工坊有13盒积木，每盒2块，共有多少块？",
      "options": [
        "27",
        "25",
        "26",
        "28"
      ],
      "answer": [
        "C"
      ],
      "explanation": "13×2=26。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q012",
      "type": "single",
      "stem": "虚构工坊有14盒积木，每盒2块，共有多少块？",
      "options": [
        "29",
        "27",
        "30",
        "28"
      ],
      "answer": [
        "D"
      ],
      "explanation": "14×2=28。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q013",
      "type": "multiple",
      "stem": "下面哪些整数是偶数？（样本13）",
      "options": [
        "5",
        "6",
        "7",
        "8"
      ],
      "answer": [
        "B",
        "D"
      ],
      "explanation": "6和8能被2整除。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q014",
      "type": "multiple",
      "stem": "下面哪些整数是偶数？（样本14）",
      "options": [
        "9",
        "10",
        "11",
        "12"
      ],
      "answer": [
        "B",
        "D"
      ],
      "explanation": "10和12能被2整除。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q015",
      "type": "multiple",
      "stem": "下面哪些整数是偶数？（样本15）",
      "options": [
        "13",
        "14",
        "15",
        "16"
      ],
      "answer": [
        "B",
        "D"
      ],
      "explanation": "14和16能被2整除。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q016",
      "type": "multiple",
      "stem": "下面哪些整数是偶数？（样本16）",
      "options": [
        "17",
        "18",
        "19",
        "20"
      ],
      "answer": [
        "B",
        "D"
      ],
      "explanation": "18和20能被2整除。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q017",
      "type": "multiple",
      "stem": "下面哪些整数是偶数？（样本17）",
      "options": [
        "21",
        "22",
        "23",
        "24"
      ],
      "answer": [
        "B",
        "D"
      ],
      "explanation": "22和24能被2整除。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q018",
      "type": "multiple",
      "stem": "下面哪些整数是偶数？（样本18）",
      "options": [
        "25",
        "26",
        "27",
        "28"
      ],
      "answer": [
        "B",
        "D"
      ],
      "explanation": "26和28能被2整除。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q019",
      "type": "multiple",
      "stem": "下面哪些整数是偶数？（样本19）",
      "options": [
        "29",
        "30",
        "31",
        "32"
      ],
      "answer": [
        "B",
        "D"
      ],
      "explanation": "30和32能被2整除。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q020",
      "type": "multiple",
      "stem": "下面哪些整数是偶数？（样本20）",
      "options": [
        "33",
        "34",
        "35",
        "36"
      ],
      "answer": [
        "B",
        "D"
      ],
      "explanation": "34和36能被2整除。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q021",
      "type": "multiple",
      "stem": "下面哪些整数是偶数？（样本21）",
      "options": [
        "37",
        "38",
        "39",
        "40"
      ],
      "answer": [
        "B",
        "D"
      ],
      "explanation": "38和40能被2整除。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q022",
      "type": "multiple",
      "stem": "下面哪些整数是偶数？（样本22）",
      "options": [
        "41",
        "42",
        "43",
        "44"
      ],
      "answer": [
        "B",
        "D"
      ],
      "explanation": "42和44能被2整除。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q023",
      "type": "boolean",
      "stem": "3×3=9。",
      "options": [
        "正确",
        "错误"
      ],
      "answer": [
        "A"
      ],
      "explanation": "3×3的结果是9。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q024",
      "type": "boolean",
      "stem": "4×3=13。",
      "options": [
        "正确",
        "错误"
      ],
      "answer": [
        "B"
      ],
      "explanation": "4×3的结果是12。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q025",
      "type": "boolean",
      "stem": "5×3=15。",
      "options": [
        "正确",
        "错误"
      ],
      "answer": [
        "A"
      ],
      "explanation": "5×3的结果是15。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q026",
      "type": "boolean",
      "stem": "6×3=19。",
      "options": [
        "正确",
        "错误"
      ],
      "answer": [
        "B"
      ],
      "explanation": "6×3的结果是18。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q027",
      "type": "boolean",
      "stem": "7×3=21。",
      "options": [
        "正确",
        "错误"
      ],
      "answer": [
        "A"
      ],
      "explanation": "7×3的结果是21。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q028",
      "type": "boolean",
      "stem": "8×3=25。",
      "options": [
        "正确",
        "错误"
      ],
      "answer": [
        "B"
      ],
      "explanation": "8×3的结果是24。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q029",
      "type": "boolean",
      "stem": "9×3=27。",
      "options": [
        "正确",
        "错误"
      ],
      "answer": [
        "A"
      ],
      "explanation": "9×3的结果是27。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q030",
      "type": "boolean",
      "stem": "10×3=31。",
      "options": [
        "正确",
        "错误"
      ],
      "answer": [
        "B"
      ],
      "explanation": "10×3的结果是30。",
      "classification": "standard",
      "expected": "accept",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q031",
      "type": "single",
      "stem": "下列A与B都正确，应选择哪项？",
      "options": [
        "2+2=4",
        "3+3=6",
        "A与B都正确",
        "都不正确"
      ],
      "answer": [
        "C"
      ],
      "explanation": "固定选项身份；不能只乱序文字后保留原字母答案。",
      "classification": "boundary",
      "expected": "review-order-dependency",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q032",
      "type": "multiple",
      "stem": "选出两个奇数。",
      "options": [
        "1",
        "2",
        "3",
        "4"
      ],
      "answer": [
        "C",
        "A"
      ],
      "explanation": "多选答案顺序不同，身份集合仍为A/C。",
      "classification": "boundary",
      "expected": "accept-set-equivalence",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q033",
      "type": "single",
      "stem": "虚构工坊有3盒积木，每盒2块，共有多少块？",
      "options": [
        "6",
        "5",
        "8",
        "7"
      ],
      "answer": [
        "A"
      ],
      "explanation": "3×2=6。",
      "classification": "boundary",
      "expected": "review-duplicate",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q034",
      "type": "single",
      "stem": "此题故意缺少答案，请提示人工复核。",
      "options": [
        "甲",
        "乙",
        "丙",
        "丁"
      ],
      "answer": [],
      "explanation": "不能静默猜出答案。",
      "classification": "boundary",
      "expected": "review-missing-answer",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q035",
      "type": "single",
      "stem": "此题答案引用不存在的选项E。",
      "options": [
        "甲",
        "乙",
        "丙",
        "丁"
      ],
      "answer": [
        "E"
      ],
      "explanation": "不能静默截断或替换答案。",
      "classification": "boundary",
      "expected": "review-invalid-answer",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q036",
      "type": "single",
      "stem": "第一行说明。\r\n第二行含中文引号“积木”与逗号，保留换行。",
      "options": [
        "甲",
        "乙",
        "丙",
        "丁"
      ],
      "answer": [
        "A"
      ],
      "explanation": "解析第一行。\n解析第二行。",
      "classification": "boundary",
      "expected": "accept-preserve-linebreak",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q037",
      "type": "single",
      "stem": "识别全角符号与数字：工号００１不是整数1。",
      "options": [
        "００１",
        "001",
        "1",
        "①"
      ],
      "answer": [
        "A"
      ],
      "explanation": "保留Unicode，避免自动数字化。",
      "classification": "boundary",
      "expected": "accept-preserve-unicode",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q038",
      "type": "single",
      "stem": "较长题干用于检查换行和完整保存。 较长题干用于检查换行和完整保存。 较长题干用于检查换行和完整保存。 较长题干用于检查换行和完整保存。 较长题干用于检查换行和完整保存。 较长题干用于检查换行和完整保存。 较长题干用于检查换行和完整保存。 较长题干用于检查换行和完整保存。",
      "options": [
        "选项甲",
        "选项乙",
        "选项丙",
        "选项丁"
      ],
      "answer": [
        "B"
      ],
      "explanation": "长题干应完整保留，不能截断。",
      "classification": "boundary",
      "expected": "accept-preserve-long-text",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q039",
      "type": "single",
      "stem": "题干有首尾空白：  虚构工坊  。",
      "options": [
        "A.是选项文本的一部分",
        "乙",
        "丙",
        "丁"
      ],
      "answer": [
        "A"
      ],
      "explanation": "选项文本内A.不等于新增选项标签。",
      "classification": "boundary",
      "expected": "review-option-marker",
      "source": "synthetic-v1",
      "version": 1
    },
    {
      "id": "Q040",
      "type": "boolean",
      "stem": "判断题答案在不同模板中可能写“正确”而不是A。",
      "options": [
        "正确",
        "错误"
      ],
      "answer": [
        "A"
      ],
      "explanation": "转换时保持答案语义；原始标签记录为正确。",
      "classification": "boundary",
      "expected": "accept-boolean-conversion",
      "source": "synthetic-v1",
      "version": 1
    }
  ]
}