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>
    <alllinks galcontinue="CH391L/S13/Introduction|27464" />
  </query-continue>
  <query>
    <pages>
      <page pageid="4" ns="0" title="Fall 2013 Biotechnology and Society" />
      <page pageid="22" ns="0" title="Bioterrorism (Biotechnology and Society)" />
      <page pageid="27464" ns="0" title="CH391L/S14/Jordan&#039;s First Assignment" />
      <page pageid="27480" ns="0" title="CH391L/S14/Alex&#039;s First assignment" />
      <page pageid="27488" ns="0" title="CH391L/S14/Jorge&#039;s First assignment" />
      <page pageid="27658" ns="0" title="Spring 2015 Microbes as Machines" />
      <page pageid="27704" ns="0" title="Fall 2016 Biotechnology and Society" />
    </pages>
  </query>
</api>