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>
    <allpages apcontinue="其他谷类及制品" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="72" ns="0" title="DRIs" />
      <p pageid="105" ns="0" title="N-亚硝基化合物" />
      <p pageid="265" ns="0" title="Test" />
      <p pageid="212" ns="0" title="仁果类" />
      <p pageid="57" ns="0" title="优势菌" />
      <p pageid="255" ns="0" title="假设检验：t检验" />
      <p pageid="236" ns="0" title="其他乳类及制品" />
      <p pageid="198" ns="0" title="其他干豆类及制品" />
      <p pageid="224" ns="0" title="其他畜肉类及制品" />
      <p pageid="230" ns="0" title="其他禽肉类及制品" />
    </allpages>
  </query>
</api>