<select name="Singlechoice[charpter_id]" id="Singlechoice_charpter_id">
<optgroup label="0">
<option value="title">搜索引擎相关</option>
</optgroup>
<optgroup label="1">
<option value="title">IP相关</option>
</optgroup>
<optgroup label="2">
<option value="title">网页相关</option>
</optgroup>
<optgroup label="3">
<option value="title">电脑基础</option>
</optgroup>
<optgroup label="4">
<option value="title">常识</option>
</optgroup>
</select>