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Insert xml to <select>
<Questions>

  <Question>
     <Id>1</Id>
     <Text>aaa</Text>
     <Reserver />
  </Question>

  <Question>
    <Id>2</Id>
    <Text>bbb</Text>
    <Reserver />
  </Question>

</Questions>

$(doc).find("Questions").each(function()
{
  $('#s').
  append( $("<option></option>").
          attr("value",$(this).find('Text').text()).
          text($(this).find('Text').text()));

});

<select id="s">
     <option></option>
 </select>