var json2 =({
  "?xml": {
    "@version": "1.0",
    "@encoding": "UTF-8"
  },
  "text": {
    "heading1": {
      "@fieldnumber": "0",
      "#text": "目的"
    },
    "objective": {
      "@fieldnumber": "1",
      "#text": "理解PH值对酶的活性的影响。"
    },
    "heading2": {
      "@fieldnumber": "2",
      "#text": "总结"
    },
    "summary": {
      "@fieldnumber": "3",
      "#cdata-section": "&#187;  酶是催化剂。它们加速生物体内的化学反应。\n<br>&#187;  因为它们的性状，一种酶只能起一种催化反应。\n<br>&#187;  酶在错误的PH值下会改变性状。\n<br>&#187;  每一种酶都有一个很窄的起作用的PH值范围。"
    }
  }
});
