You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allredirects garcontinue="膳食营养素参考摄入量|72" />
  </query-continue>
  <query>
    <pages>
      <page pageid="116" ns="0" title="糖类" />
      <page pageid="147" ns="0" title="抗脚气病因子" />
      <page pageid="148" ns="0" title="抗神经炎因子" />
      <page pageid="149" ns="0" title="硫胺素" />
      <page pageid="150" ns="0" title="硫胺" />
      <page pageid="158" ns="0" title="抗坏血酸" />
      <page pageid="183" ns="0" title="核黄素" />
      <page pageid="228" ns="0" title="灰分" />
      <page pageid="287" ns="0" title="沙门氏菌属" />
      <page pageid="289" ns="0" title="致病性大肠埃希氏菌" />
    </pages>
  </query>
</api>