var json2 =({
  "?xml": {
    "@version": "1.0",
    "@encoding": "UTF-8"
  },
  "text": {
    "heading1": {
      "@fieldnumber": "0",
      "#text": "目的"
    },
    "objective": {
      "@fieldnumber": "1",
      "#text": "理解不同细胞对应不同的功能。"
    },
    "heading2": {
      "@fieldnumber": "2",
      "#text": "总结"
    },
    "summary": {
      "@fieldnumber": "3",
      "#cdata-section": "&#187;  不同的细胞对应不同的功能，它们叫特定细胞。\n<br>&#187;  鼻腔和呼吸道都布满了粘膜。它们能产生粘液。\n<br>&#187;  粘液细胞有运输粘液的纤毛。\n<br>&#187;  粘液能够保持肺部清洁。"
    }
  }
});
