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>
    <pages>
      <page pageid="1" ns="0" title="Main Page">
        <links>
          <pl ns="0" title="Recruitment" />
          <pl ns="0" title="Tzung-May FU" />
          <pl ns="0" title="Xiaolin WANG" />
          <pl ns="0" title="Yumin LI" />
          <pl ns="0" title="本科生科研或毕业设计题目" />
        </links>
      </page>
    </pages>
  </query>
</api>