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="BIO337_2014" />
  </query-continue>
  <query>
    <allpages>
      <p pageid="198" ns="0" title="BCH339N 2016" />
      <p pageid="207" ns="0" title="BCH339N 2018" />
      <p pageid="205" ns="0" title="BCH364C BCH394P 2017" />
      <p pageid="168" ns="0" title="BCH391L 2015" />
      <p pageid="212" ns="0" title="BCH394P BCH364C 2019" />
      <p pageid="213" ns="0" title="BCH394P BCH364C 2020" />
      <p pageid="228" ns="0" title="BCH394P BCH364C 2021" />
      <p pageid="254" ns="0" title="BCH394P BCH364C 2022" />
      <p pageid="264" ns="0" title="BCH394P BCH364C 2023" />
      <p pageid="265" ns="0" title="BCH394P BCH364C 2024" />
    </allpages>
  </query>
</api>