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怎么获取这个答题的选项和按钮呢，想做一个自动答题的js脚本

<div class="PDFmodal-box" style="display: none;">
    <div class="posi-r PDFmodal-father">
        <div class="PDFmodal-bg">
            <div class="center f28 text-f999">课堂问答</div>
            <div class="f22 font-w7 mb10" du-html="topic" du-scope="C53C86AB_B3B6_E1A2_0F7A_249EE0493439">这个是题目</div>
            <ul class="pl20 f18 PDFmodal-xx checkboxul" repeat-id="777EB527_09BE_EBEB_E4C6_F4C327C8966B" repeat-base-name="options"></ul>
            <ul class="pl20 f18 PDFmodal-xx radioul" repeat-id="9493A36B_9998_EF58_C552_6299E1FF1CF0" repeat-base-name="options"></ul>
            <div class="text-right f18">
                <span class="PDFmodal-btn" du-click="clickbtn" du-scope="C53C86AB_B3B6_E1A2_0F7A_249EE0493439">确定</span>
            </div>
        </div>
    </div>
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