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      "stem": "虚构工坊有3盒积木，每盒2块，共有多少块？",
      "explanation": "3×2=6。",
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      "stem": "虚构工坊有4盒积木，每盒2块，共有多少块？",
      "explanation": "4×2=8。",
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          "content": "9",
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          "content": "8",
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      "stem": "虚构工坊有5盒积木，每盒2块，共有多少块？",
      "explanation": "5×2=10。",
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          "key": "C",
          "content": "10",
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      "stem": "虚构工坊有6盒积木，每盒2块，共有多少块？",
      "explanation": "6×2=12。",
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          "content": "13",
          "correct": false
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          "key": "B",
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          "key": "C",
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      "stem": "虚构工坊有7盒积木，每盒2块，共有多少块？",
      "explanation": "7×2=14。",
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          "key": "A",
          "content": "14",
          "correct": true
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          "key": "B",
          "content": "13",
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          "key": "C",
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      "stem": "虚构工坊有8盒积木，每盒2块，共有多少块？",
      "explanation": "8×2=16。",
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          "correct": false
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          "content": "16",
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      "stem": "虚构工坊有9盒积木，每盒2块，共有多少块？",
      "explanation": "9×2=18。",
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          "key": "A",
          "content": "19",
          "correct": false
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          "key": "B",
          "content": "17",
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          "key": "C",
          "content": "18",
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      "stem": "虚构工坊有10盒积木，每盒2块，共有多少块？",
      "explanation": "10×2=20。",
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      "sourceId": "Q008",
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      "stem": "虚构工坊有11盒积木，每盒2块，共有多少块？",
      "explanation": "11×2=22。",
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          "correct": true
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      "sourceId": "Q009",
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      "stem": "虚构工坊有12盒积木，每盒2块，共有多少块？",
      "explanation": "12×2=24。",
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          "key": "A",
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          "correct": false
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          "content": "24",
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          "key": "C",
          "content": "26",
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      "stem": "虚构工坊有13盒积木，每盒2块，共有多少块？",
      "explanation": "13×2=26。",
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      "stem": "虚构工坊有14盒积木，每盒2块，共有多少块？",
      "explanation": "14×2=28。",
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          "content": "9",
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          "key": "A",
          "content": "13",
          "correct": false
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          "key": "B",
          "content": "14",
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          "key": "A",
          "content": "17",
          "correct": false
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          "key": "B",
          "content": "18",
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          "key": "A",
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          "key": "C",
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      "stem": "下面哪些整数是偶数？（样本19）",
      "explanation": "30和32能被2整除。",
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          "key": "A",
          "content": "29",
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          "key": "C",
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      "explanation": "34和36能被2整除。",
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          "key": "A",
          "content": "33",
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          "key": "B",
          "content": "34",
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          "key": "C",
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      "explanation": "38和40能被2整除。",
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          "key": "A",
          "content": "37",
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          "key": "B",
          "content": "38",
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          "key": "C",
          "content": "39",
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      "explanation": "42和44能被2整除。",
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          "key": "A",
          "content": "41",
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          "key": "B",
          "content": "42",
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          "key": "C",
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      "stem": "3×3=9。",
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      "stem": "4×3=13。",
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          "content": "正确",
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      "stem": "5×3=15。",
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      "stem": "6×3=19。",
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      "stem": "7×3=21。",
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      "stem": "8×3=25。",
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