下列源代码段在IE 5.0中的解析结果如题52图所示，仔细阅读源代码和题52图，按要求完成后面各题。
VRML语言<／title><／head><body><h3>8.4 VRML简介<／h3><hr width=50％ align=left color=000000><pre><font size=2> VRML (Virtual Reality Modeling Language)是一种模型语言，是描述虚拟环境中场景的一种标准。它定义了三维应用中常用的语言描述，<br>并具有简单的行为特征描述功能。<／font><／pre> <／body> <／html> </p><p><img src="https://img.ixiawen.com/uploadfile/2017/0713/20170713101049828.jpg"></p><p>若将网页中的横线居中，如何修改源代码</p></a>
</div>
<div class="content_bottom">
<span class="text_right"><a href="https://app.ixiawen.com/question/26204317/40593a9b6f62df09b772f520910a9fef.html" class="blue" target="_blank">查看答案</a></span>
</div>
</div>
<div class="line"></div>
<div class="content_border">
<div class="content_top">
<span class="text_left reb">单项选择题</span>
</div>
<div class="list">
<a href="https://app.ixiawen.com/question/38653853/2c41ce00832a106647725f1dd98a8fba.html" class="black" target="_blank"><p>下面______不是网络信息系统安全管理需要遵守的原则。</p><p>A．多人负责原则</p><p>B．任期有限原则</p><p>C．多级多目标管理原则</p><p>D．职责分离原则</p></a>
</div>
<div class="content_bottom">
<span class="text_right"><a href="https://app.ixiawen.com/question/38653853/2c41ce00832a106647725f1dd98a8fba.html" class="blue" target="_blank">查看答案</a></span>
</div>
</div>
<div class="line"></div>
</section>
<footer>
<div class="xieyi">
<div class="w">
<a href="https://www.ixiawen.com/about/fuwu.html" rel="nofollow" class="hui" target="_blank">服务协议</a>
</div>
<div class="w_center">|</div>
<div class="w">
<a href="https://www.ixiawen.com/about/yinsi.html" rel="nofollow" class="hui" target="_blank">隐私权政策</a>
</div>
<div class="w_center">|</div>
<div class="w">
<a href="https://www.ixiawen.com/" class="hui" target="_blank">APP下载</a>
</div>
</div>
</footer>
</body>
</html>