单选题
一个HTML文件的起始标记为（）。
A
B
</p><p><span>C</span><html></p><p><span>D</span><meta><meta /></p></div><div class="info"><h3 class="title">正确答案</h3><script>ai2();</script><div class="text"><img alt="来源：www.examk.com" 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" /></div></div><div class="info"><h3 class="title">答案解析</h3><div class="text"> 本题考查应试者网页文件方面的基本知识。<br /> HTML文档是普通文本(ASCII)文件，它可以用任意编缉器生成。每个HTML文档应该包含一些标准HTML标记，每个文档都包含头head和正文body text两部分。头中含有标题title，正文中含有实际构成段落、列表和其他元素的文本。浏览器需要具体的信息是因为它们都是根据HTML和SGML说明编程的。<br /> ＜html＞、＜head＞、＜title＞和＜body＞标记是HTML文档中必须有的元素(和它们相应的结束标记)。其中＜html＞是一个HTML的起始标记，它的作用是让浏览器知道这是HTML文件。 </div></div></div><div class="box"><div class="hd"><div class="title title--blue"><i class="icon"></i><span>相似试题</span></div></div><ul class="qlist"><li><p class="text">在Outlook中可以借助（）的方式传送一个文件。</p><p class="ft"><span class="mode">单选题</span><a href="/p/3242126849.html" class="btn-outline">查看答案</a></p></li><li><p class="text">在Outlook中，通常借助（）来传送一个文件。</p><p class="ft"><span class="mode">单选题</span><a href="/p/3657017124.html" class="btn-outline">查看答案</a></p></li><li><p class="text">某Internet主页的URL地址为http：//www.test.com.cn／product／index.html，该地址的域名是（）。</p><p class="ft"><span class="mode">单选题</span><a href="/p/954835113.html" 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