first round
C D A B
Second level
<!-- ********* Begin ********* -->
<fieldset>
<legend>请选择个人爱好</legend>
<input type="checkbox" name="hobby" >音乐</input>
<input type="checkbox" name="hobby" >体育</input>
<input type="checkbox" name="hobby" >其他</input>
</fieldset>
<!-- ********* End ********* -->
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