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>
    <querypage qpoffset="10" />
  </query-continue>
  <query>
    <querypage name="Ancientpages">
      <results>
        <page value="20160222092327" timestamp="2016-02-22T09:23:27Z" ns="0" title="细菌" />
        <page value="20160402034446" timestamp="2016-04-02T03:44:46Z" ns="0" title="营养学" />
        <page value="20160402035133" timestamp="2016-04-02T03:51:33Z" ns="0" title="食品卫生学" />
        <page value="20160402094115" timestamp="2016-04-02T09:41:15Z" ns="0" title="脂肪" />
        <page value="20160529135635" timestamp="2016-05-29T13:56:35Z" ns="0" title="营养与食品卫生学" />
        <page value="20160603062650" timestamp="2016-06-03T06:26:50Z" ns="0" title="食物中的生物活性成分" />
        <page value="20160722065619" timestamp="2016-07-22T06:56:19Z" ns="0" title="类胡萝卜素" />
        <page value="20160722070236" timestamp="2016-07-22T07:02:36Z" ns="0" title="皂苷类化合物" />
        <page value="20160722074031" timestamp="2016-07-22T07:40:31Z" ns="0" title="多酚类化合物" />
        <page value="20160722074226" timestamp="2016-07-22T07:42:26Z" ns="0" title="蛋白酶抑制剂" />
      </results>
    </querypage>
  </query>
</api>