<select id="hoge">
<option value="a">slect A</option>
<option value="b">slect B</option>
<option value="c">slect C</option>
<option value="d">slect D</option>
<option value="e">slect E</option>
</select>

<div id="slct_form"></div>

<script>
$('#hoge').change(function() {
  $('#slct_form').append($('#hoge').val());
});
</script>